Campuses:
219 Hodson Hall, 1980 Folwell Ave.
University of Minnesota, St. Paul, MN 55108
phone: (612) 624-6771
FAX: (612) 625-5299
E-mail: ragsd001@tc.umn.edu
Ph.D. Entomology and Microbiology, Louisiana StateUniversity, 1980
M.S. Entomology and Microbiology, Louisiana State University,1977
B.S. Biology, Point Loma College, 1974
Dr. David Ragsdale has been a professor in the Department of Entomology in the College of Agricultural, Food, and Environmental Sciences (CFANS) for 24 years. Dr. Ragsdale’s research interests are focused in two broad areas: 1) management of insect vectors of plant pathogens and 2) using arthropod herbivores to control invasive perennial plants.
Dr. Ragsdale leads an intensive multistate effort in the North Central US on the invasive aphid, Aphis glycines, or soybean aphid, whose native range is Asia. Dr. Ragsdale and colleagues have studied the overwintering biology of this aphid, evaluated the vector potential of this new exotic aphid, conducted foreign exploration for natural enemies of the soybean aphid in China, Japan and Korea for possible introduction into the U.S., and have developed management strategies to help soybean producers minimize losses caused by this invasive insect. In 2003, the Minnesota Soybean Research and Promotion Council recognized Dr. Ragsdale for his pioneering work on soybean aphid biology in North America.
Dr. Ragsdale is also a recognized authority in the area of potato pest management. Dr. Ragsdale has developed non-chemical control strategies that limit the spread of aphid-transmitted plant viruses in seed potato that have been adopted by virtually all seed growing regions in North America. His work includes molecular characterization of virus strains, identifying resistant genes in wild Solanum germplasm that might impart resistance to aphids and viruses in cultivated potato, and practical application of cultural practices that limit the spread of aphid transmitted viruses. In 2002, Dr. Ragsdale and his colleague Dr. Radcliffe, were jointly awarded the Meritorious Service Award by the National Potato Council for their work on aphid transmitted viruses in potatoes and a research article published in the American Journal of Potato Research was selected as the Outstanding Paper for 2004.
The use of insect herbivores to control invasive perennial weeds such as purple loosestrife, leafy spurge, garlic mustard and buckthorn represent the active projects Dr. Ragsdale is involved with along with colleagues at CABI, Delemont, Switzerland, Minnesota DNR and MDA and Agronomy and Plant Genetics (Weed Science). Projects range from discovery of agents overseas to developing methods of dispersing insects approved for release in North America. Dr. Ragsdale was honored by the Minnesota Vegetation Management Association of Minnesota for his work on biological control of purple loosestrife in Minnesota.
Dr. Ragsdale taught an undergraduate course, Economic Entomology for over 20 years, a graduate level course in Insects as Vectors of Plant Pathogens, and currently team-teaches an introductory course with faculty in weed science and plant pathology, Pests and Crop Protection. Dr. Ragsdale was elected as the Outstanding Teacher in the College of Agriculture by the student board in 1988 and was nominated by the College of Agriculture for the Horace T. Morse-Minnesota Alumni Association for outstanding contributions to undergraduate education
Graduate Research Assistant, Louisiana State University, 1975-1979
Research Associate, Louisiana State University, 1979-1981
Assistant Professor, University of Minnesota 1981-1987
Associate Professor, University of Minnesota 1987-1994
Professor, University of Minnesota 1994-present
Coordinator, College of Agriculture Food and Environmental Science - Biological Control Initiative, 1995-2000
Interim Quarantine Officer, State of Minnesota, High Security Containment Facility, 2003-2004
Director of Graduate Studies, Entomology Program, 2008-2009
Interim Head, Entomology 2009-present
President's Scholarship, 1970-1971
Pasadena College (now Point Loma College) Scholarship, 1971-1974
Outstanding Student in Science and Mathematics, Point Loma College, 1973
Outstanding Teacher of the College of Agriculture, COA Student Board, 1988-1989
College of Agriculture's Nominee for the Horace T. Morse-Minnesota Alumni Association for Outstanding Contributions to Undergraduate Education, 1993
Recognition Award, Vegetation Management Association of Minnesota, 1998
Meritorious Service Award, National Potato Council, 2002 (with E. B. Radcliffe)
Certificate of Appreciation, Minnesota Soybean Research & Promotion Council, Research and Tech Transfer, 2002
Outstanding Paper Award, Potato Association of America, for best paper in American Journal of Potato Research, 2002, Awarded July 2003.
2005 Entomology Educational Project Award from the Board Certified Entomologists of Mid-America. Special Project: “Consensus Recommendation for Soybean Aphid Control”. Awarded March 2005 at the North Central Branch Meeting, Entomological Society of America.
Carol Mortensen Invasive Species Management Award, Minnesota Invasive Species Council, 2008
National Excellence in Research Award for S1039 in 2009, nominated by the Southern Association of Agricultural Experiment Station Directors, 2008 and 2009.
Entomological Society of America
Potato Association of America
International Organization for Biological Control
Judge, Student Competition, Southeastern Branch - ESA, student member, 1979 Student Competition Ten-Minute Paper Presentation, Section C, Annual Meeting ESA, 1991, 1997,- 2001, Student Competition Poster Displays, Section C, Annual Meeting ESA, 1992, 2004, Moderator Student Competition ESA, 2005
Minnesota Representative to: S-157, Tactics for management of soybean pest complexes, 1982-85; NCR-125 Biological Control of Arthropod Pests, 1983, 1991; USDA/ARS/NPS Biological Control Planning Workshop, 1984, NC-502 Soybean Aphid, 2000-2002, S1010 Dynamic Soybean Pest Management for Evolving Agricultural Technologies and Cropping Systems, chair-elect in 2004; WERA89 Potato Viruses, 2001-present; NCR 201, Integrated Pest Management, 2004, NCR205 Potato Research and Extension Program (was NCT-190)
Journal Reviewer for Journal of Economic Entomology, Environmental Entomology, Annals of the Entomological Society of America, Annals of Applied Biology, Journal of the Kansas Entomological Society, Science, J. Entomol. Sci., Biological Control, Journal of Invertebrate Pathology, Agronomy Journal, Molecular Ecology, American Journal of Potato Research, Plant Disease, Phytopathology, Crop Science, British Ecological Society.
Ad-Hoc grant reviewer for USDA/CSRS - NRICGP, USDA - BARD, USDA IPM western regional grants program, National Geographic Society.
Review Panel Member, USDA-IPM/Northeastern Region, 1990, 1992, 1996; USDA/ARS/National Potato Council, 1989, 1990, 1991, 1994, 2001, 2004
Editorial Committee, American Potato Journal, Potato Association of America, Entomology Section, 1994-1996.
National Biological Control Institute, Customer Advisory Committee, 1997
Entomological Society of America, Strategic Planning Committee, appointed 1998-2001
Elected Secretary of Subsection Cc, Insect Vectors of Plant pathogens, served as president-elect in 1999 and president in 2000
Entomological Society of America, co-chair, NCB Program Committee (with R. D. Moon), March 2000.
Appointed to ESA Membership Committee, Section C representative, 2000 for 3 year term, elected chair 2003.
Elected as Secretary Treasurer for the North Central Branch of the Entomological Society of America, 2007-2009
Summary of Grant Activity
Total number of grants, 134
45 national competitive grants from federal agencies
47 grants from commodity boards, state and regional
19 grants from state agencies
14 grants from competitive University and Collegiate sources
9 grants from Industry partners
Total funds awarded since 1980: $13,442,829 (includes total award for multi-authored grants) Funds used to support graduate students and post-docs in my lab or for students I’ve co-advised: $ 4,172,175
National Competitive Grants (e.g., USDA NC-IPM, USDA-CSREES, USDA-APHIS, NCSRP, NSF-IGERT, EPA)
45 grants awarded for a total of $5,695,621 for which $1,498,394 was used to support students and post-docs in my laboratory.
State Funds (all awarded on a competitive basis, does not include CRIS project funds)
19 grants awarded for a total of $2,538,805 for which $1,047,670 was used to support students in my laboratory.
Commodity Check-off Funds (potato and soybean)
47 grants awarded for a total of $3,927,668 for which $1,140,944 was used to support students in my laboratory and a Research Assistant Professor in the Department.
9 larger contracts ($172,375) and numerous small grants awarded for an approx total of $200,000 in general support, usually in the form of unrestricted gifts.
14 grants awarded for a total of $1,138,335 for which $535,317 were used to support students and post-docs in my laboratory.
1990 Greater Minnesota Corporation/Minnesota Honey Producers Assoc. "Diagnostic test for honeybee mites" with B. Furgala 29,859 29,859
1990 ARS/National Potato Council. "Incorporation of resistance to green peach aphid" with F. Lauer & E. B. Radcliffe, CL RA 18K 31,000 22,333
1990 ARS/National Potato Council. "Action thresholds for an aphid vector of potato leafroll virus in virus susceptible and resistant potato cultivars" with E. B. Radcliffe (CDD RA, 18K) 21,700 21,700
1990 Old Dutch Potato Funds, University of Minnesota. "Refining action thresholds for green peach aphids a vector of potato leafroll virus" 1,500 1,500
1991 ARS/National Potato Council. "Action thresholds for an aphid vector of potato leafroll virus in virus susceptible and resistant potato cultivars" with E. B. Radcliffe 22,700 22,700
1991 ARS/National Potato Council. "Incorporation of resistance to green peach aphid" with E. B. Radcliffe & F. I. Lauer (CL RA) 36,165 24,055
1991 Old Dutch Potato Funds, University of Minnesota. "Refining action thresholds for green peach aphids a vector of potato leafroll virus" with C. DiFonzo 4,000 4,000
1991 Minnesota LCMR "Develop assays to detect pathogens of European corn borers and grasshoppers selected for field efficacy trials (competitive renewal)" 40,000 40,000
1991 Minnesota LCMR "Evaluate the impact of insects established for biological control of leafy spurge 40,000 40,000
1992 USDA North Central IPM Competitive Grants Program-NCS3 "Management of Potato Virus Y: Epidemiology and Cultural Control" with E. B. Radcliffe & E. E. Banttari 124,598 41,533
1992 ARS/National Potato Council "Incorporation of resistance to green peach aphid" with E. B. Radcliffe & F. I. Lauer 37,665 5,000
1992 Red River Valley Potato Grower's Association" Potato Virus Y in Potato Seed Production: Spread and Control" 47,500 47,500
1992 Red River Valley Potato Grower's Association "Aphid Vectors of Potato Virus Y" 12,383 12,383
1992 North Dakota Seed Growers "Aphid Vectors of Potato Virus Y" 6,000 6,000
1992 Minnesota Department of Agriculture Seed Certification "Aphid Vectors of Potato Virus Y" 6,000 6,000
1992 Old Dutch Potato Chip Fund "PVY Research Support" 6,000 6,000
1992 Area II Potato Grower's Association"Integrated Pest Management for Control of Potato Virus Y" 5,000 5,000
1993 ARS/National Potato Council "Incorporation of resistance to green peach aphid" with E. B. Radcliffe & F. I. Lauer (CL, RA)
40,868 26,956
1993
Minnesota LCMR "Release and evaluation of a microsporidian pathogen for biological control of the European corn borer" 57,000 57,000
1993 Minnesota LCMR, DNR, & MDA "Biological Control of Purple Loosestrife", with Becker, Nyval, & Andow 240,000 80,000
1993 Minnesota LCMR, Minnesota DNR, & U.S. Army Corps of Engineers, "Biological Control of Eurasian Watermilfoil" with R. M. Newman, D. D. Biesboer, & J. A. Perry 340,000 20,000
1993 Parker-Sanders Fund, COA-UM, "Crop borders and management of potato virus Y" (CDD RA partial) 13,750 13,750
1994 USDA/National Potato Council, "Incorporation of Resistance to Green Peach Aphid, Potato Leafroll Virus and Potato Virus Y" with E. B. Radcliffe & F. I. Lauer (CL RA) 41,454 27,151
1994 Agricultural Utilization Research Institute, State of Minn. "Crop Borders - A novel nonchemical management strategy for Potato Virus Y" with E. B. Radcliffe (CDD RA 20K) 40,030 40,030
1994 USDA-IPM/Extension, "Crop Borders - a preventative strategy for control of potato virus Y" with E. B. Radcliffe, G. Secor (NDSU), N. Gudmestad (NDSU), D. Preston, C. Holen 32,950 12,440
1994 Area II “Aster leafhopper and purple top in potato: control strategies”, with E. E. Banttari 5,000 2,500
1995 Purple loosestrife and eurasian watermilfoil control (Minnesota DNR and LCMR) with Andow, Becker & Nyvall 250,000 63,333
1995 Cultivar specific aphid thresholds to control potato leafroll virus in processing potatoes (AURI) with E. B. Radcliffe (RS RA, 20K) 30,020 30,020
1995 Implementing classical biological control for the European corn borer using an exotic microsporidian (MDA) 56,360 56,360
1995 Incorporation of resistance to green peach aphid potato leafroll virus and potato virus Y, USDA-NPC with Radcliffe, Lauer, Bamberg and Hanneman (CT partial support) 20,335 14,335
1995 Area II Potato Growers, 3 proposals (Aster Yellows, Breeding, PLRV control) with Radcliffe, Banttari, Lauer 17,000 17,000
1996 Incorporation of resistance to green peach aphid, potato leafroll virus and potato virus Y 29,632 23,211
1996 Effect of alternative Colorado potato beetle control strategies on aphids and PLRV incidence, USDA-NPC with Radcliffe 25,050 25,050
1996 Area II Potato Growers, 4 proposals (Breeding enhancement, PLRV control, transgenic plant with beetle and virus resistance, insecticide efficacy testing). w/Lauer & Radcliffe 26,000 26,000
1996 Development of polymerase chain reaction-based probes for native and exotic microsporidians of European corn boer, Ostrinia nubilalis. COAFES - BCI, Longtine & Ragsdale 24,691 24,691
1996 RRVPGA, Interaction of early and late blight control on green peach aphids and PLRV spread with Radcliffe 4,000 4,000
1996 RRVPGA, Cultivar specific aphid thresholds to control potato leafroll virus in processing potatoes with Radcliffe 6,000 6,000
1997
Purple loosestrife and Eurasian water milfoil control
(DNR and LCMR) with Becker and Newman 300,000 90,000
1997 Interference of potato fungicides used for late blight control
with parasitic fungi that kill aphids (LCMR) with Radcliffe (JRR RA 20K& Res. Assoc.) 68,459 68,459
1997 Suppression of entomopathogenic fungi of green peach and potato aphids by late blight fungicides (USDA/National Potato Council) with Radcliffe 33,054 33,054
1997 Incorporation of resistance to green peach aphid, potato leafroll virus and potato virus Y (USDA/National Potato Council) with Radcliffe, Backland and Thill 28,648 22,883
1997 Interference of Late Blight Fungicides with Entomopathogens of Myzus persicae (USDA-NC-IPM) with Radcliffe 74,996 74,996
1997 Support of potato research program from Area II potato research and promotion council (four projects) with Radcliffe 18,000 18,000
1997 Screening late blight fungicides for toxicity to green peach aphids (RRVPGA) with Radcliffe 5,200 5,200
1998 Germplasm enhancement and breeding for insect resistance (Area II Potato Growers) with Radcliffe and Thill 8,000 2,000
1998 Pesticide Impacts in the Potato Ecosystem (Area II Potato Growers) with Radcliffe and Thill 15,000 7,500
1998 Late Blight and Aphid Control (Red River Valley Potato Growers) with Radcliffe 4,000 2,000
1998 Resistance to green peach aphid, PLRV and PVY (USDA/NPC) with Radcliffe, Thill, Bamberg, & Hanneman 31,993 2,000
1998 Can fungi regulate green peach aphid populations (USDA/NPC) with Radcliffe 27,920 27,920
1998 Potato and Seed Potato Diseases, CAFES Rapid Response Fund with Radcliffe, Lockhart, and MacRae 165,000 135,000
1998 Purple loosestrife, cooperator rearing program (USDA/NBCI) 11,000 11,000
1999 Aphid Alert: Virus and vector surveillance and management
strategies for potato (USDA/CSREES, NC-IPM) with Radcliffe, Lockhart, and MacRae 97,000 48,500
1999 Novartis, Can Fulfill (pymetrozine) interfere with PLRV and PVY transmission? 1999-2001 30,000 30,000
1999 Agrochemical company grant-in-aid with Radcliffe 15,900 7,950
1999 Area II potato Growers, Pesticide Impacts in the Potato Ecosystem, with Radcliffe 15,000 7,500
1999 Area II Potato Growers, Breeding for Resistance to Aphids, PLRV, PVY and leafhoppers, with Thill & Radcliffe 12,000 4,000
1999 Red River Valley Potato Growers, Minituber planting and vine kill dates, with Radcliffe 6,000 3,000
1999 USDA/National Potato Council, Incorporation of Resistance to Green Peach Aphid, PLRV and PVY, with Thill and Radcliffe 32,155 3,216
1999 Minnesota Department of Agriculture, Evaluate establishment, impact of leafy spurge biocontrol agents, LCMR subcontract 51,264 51,264
1999 Aphid Alert: Virus and vector surveillance and management
strategies for potato (Rapid Response Fund) with Radcliffe, Lockhart, and MacRae 100,000 100,000
2000 Resistance to green peach aphid, potato leafroll, and potato virus Y (USDA, ARS, National Potato Council) with Thill and Radcliffe 40,779 36,197
2000 Area II Potato Growers, Breeding for Resistance to Aphids, PLRV, PVY and leafhoppers, year 3 of 3 with Thill & Radcliffe 15,000 0
2000 Area II potato Growers, Pesticide Impacts in the Potato Ecosystem, year 3 of 3 with Radcliffe 12,000 12,000
2000 Red River Valley Potato Growers, Minituber planting and vine kill dates, year 2 of 2, with Radcliffe 6,000 6,000
2000 Aphid Alert: Virus/vector surveillance & management strategies for potato with Radcliffe, MacRae, Lockhart 164,507 132,257
2000 Development of multipurpose potato cultivars with disease and insect resistance, subcontract with Gudmestad, Lorenzen, Secor 175,568 3,180
2000 LCMR/Minnesota DNR, Purple loosestrife and Eurasian watermilfoil biological control. Fifth and final renewal. With R. Becker and E. Stamm-Katovich 195,000 97,500
2000 North Central Soybean Research Program. With Rob Venette, selected for full-proposal submission. 97,173 76,913
2000 Aphid Biology: CSREES, critical issues fund, with 5 collaborating states. Lead PI, David Voegtlin, Ill. Nat. Hist. 28,000 5,000
2000 Site Specific Management of Potato Virus Vectors with MacRae and Radcliffe, USDA, NCIPM with I. MacRae, E. B. Radcliffe. 75,215 75,215
2000 Meeting the challenge of a new soybean insect pest, the soybean aphid, K. Ostlie and D. W. Ragsdale. Minnesota Soybean Research & Promotion Council for Soybean Extension Education and Applied Research 30,000 15,000
2001 Taxonomic Studies of Aphis glycines Matsumura in support of classical biological control, with S. Weller and G. Heimpel. USDA APHIS NBCI. 20,000 10,000
2001 Foreign exploration for natural enemies of the soybean aphid, Aphis glycines Matsumura, R. J. O’Neil lead PI, (U of MN subcontract along with G. Heimpel) 40,000 14,291
2001 Site-Specific Management of Green Peach Aphid in Potato, E. B. Radcliffe, D. W. Ragsdale, and I. MacRae, Submitted to AURI 39,996 39,996
2001 Meeting the challenge of a new soybean insect pest, the soybean aphid, K. Ostlie and D. W. Ragsdale. Minnesota Soybean Research & Promotion Council for Soybean Extension Education and Applied Research, year 2 25,000 0
2001 Selection for Pesticide Resistance in Parasitoids of Green Peach Aphid, MDA IPM program w/ Munyaneza &Radcliffe 42,801 42,801
2001 Developing resistance to PVY and PLRV viruses in potato cultivars and its influence on aphid behavior. USDA NPC, with Ragsdale, Thill and Radcliffe as co-PIs. 49,964 23,000
2001 Development of multipurpose potato cultivars with enhanced quality, disease and pest resistance – North Central Program, with collaborators in 4 states (MI, ND, WI, and MN), collaborator, Thill as lead PI 480,000 20,000
2001 Evaluate the establishment and impact of leafy spurge biocontrol agents, 2 separate addenda to current project, D. W. Ragsdale, lead PI 11,500 11,500
2001 Biology, Risk Assessment and Management of the Soybean Aphid, Rapid Response Fund, with Ostlie (lead PI) and Venette and Ragsdale as collaborators 100,000 7,919
2001 North Central Soybean Research Program. D. Ragdale and R. Venette – co PIs. Competitive renewal. 101,569 80,959
2001 Pesticide Impacts of the potato ecosystem: a site specific pest management of green peach aphid, D. W. Ragsdale, I. V. MacRae and Radcliffe as co PIs, Minnesota Area I and Area II potato growers 22,300 17,300
2002 USDA ARS. Potato Industries Special Projects. D. W. Ragsdale, I. MacRae and E. B. Radcliffe as co PIs 31,230 31,230
2002 Minnesota Soybean Research & Promotion Council. Multitactic Approach for Management of Soybean Aphid, with Ostlie (lead PI) with Ragsdale, MacRae, Venette, Orf, Gunsolus, and Somers, 74,414 43,561
2002 Northern Plains Potato Growers Assoc. Aphid Alert, Rapid Response Fund, Ragsdale, Radcliffe and MacRae, co PIs 60,340 60,340
2002 USDA CSREES Aphis glycines – overintering distribution and spring emigration, subcontract with U of Ill., Dave Voegtlin lead PI 29,500 4,660
2002 USDA/APHIS/NBCI. Foreign exploration for natural enemies of the soybean aphid, Aphis glycines Matsumura, R. J. O’Neil lead PI, (U of MN subcontract along with G. Heimpel) 40,000 14,500
2002 USDA/APHIS/NBCI. Quarantine support for foreign exploration for natural enemies of the soybean aphid, Aphis glycines Matsumura, G. Heimpel, (lead), and D. Ragsdale. 54,527 5,5002003 Management of soybean aphid in the North Central States, NCSRP. Ragsdale as project manager and PI, with collaborators from 5 states 173,694 75,414
2003 Development of Multipurpose Potato Cultivars with Enhanced Quality, Disease and Pest Resistance – North Central Program, USDA CSREES, Quad State Program, G. Secor as Lead PI. 260,000 20,000
2003 USDA APHIS, Collecting, Screening and Evaluating Exotic Natural Enemies of the Soybean Aphid, by Heimpel, Ragsdale, Wu, Hopper, Voegtlin, Hoelmer & O’Neil (lead PI). 153,500 0
2003 MN Soybean Research & Promotion Council, Ragsdale, Venette, Heimpel, Ostlie, McRae, Orf 50,000 38,935
2003 Garlic Mustard Biological Control, MN DNR D. W. Ragdale, R. Becker, J. Katovich as co PIs 82,173 40,000
2003 US EPA and American Farmland Trust, Reducing organophosphate use in potato production. E. B. Radcliffe, D. W. Ragsdale and I. V. McRae as co-PIs 44,342 44,342
2003 Grant-in-Aid, Various Chemical Companies for testing candidate materials in potato and soybean, with E. B. Radcliffe and B. Potter 45,000 23,000
2004 NC-IPM, Reassessment of crop borders for management of potato virus Y in seed potatoes. E. B. Radcliffe (lead PI), D. W. Ragsdale, and I. V. McRae. 57,252 57,252
2004 Management of soybean aphid in the North Central States, NCSRP. Minnesota leads a 6 state proposal, year 2 of 3, Ragsdale and project manager 227,001 95,272
2004 Purple loosestrife and buckthorn biological control, Minnesota DNR, D. W. Ragsdale, lead PI 31,800 31,800
2004 Impacts of natural enemies on soybean aphid population growth and development, MN SR&PC, D. Ragsdale and G. Heimpel, co PIs 52,000 28,341
2004 Biological control of soybean aphid, U of MN RARF, D. W. Ragsdale and G. Heimpel, co-PI 70,000 0
2004 Role of virus strain and aphid vectors in sustaining the current PVY epidemic in Minnesota seed potatoes, U of MN RARF, co-PI with E. B. Radcliffe 50,000 0
2004 Soybean Aphid in the North Central US: Implementing IPM at the Landscape Scale, USDA RAMP, with D. Landis, MSU as lead PI 1,500,000 149,922
2004 Development of Multipurpose Potato Cultivars with Enhanced Quality, Disease and Pest Resistance – North Central Program, USDA CSREES, Quad State Program, Thill lead P.I. 260,000 15,000
2004 Biology, Risk Assessment and Management of the Soybean Aphid (Renewal), U of MN RARF, with Ostlie as lead PI 248,507 0
2004 Soybean aphid suppression using a fall-seeded rye cover crop, USDA Integrated Organic Program, with Heimpel, Porter, and Potter. With Heimpel and lead PI 463,645 155,526
2004 Identification and characterization of resistance to PVY, PLRV and green peach aphid, USDA ARS Potato Research Program Co-PI with E. B. Radcliffe 39,046 39,046
2004 Impacts of natural enemies on soybean aphid population growth and development, year 2, Minnesota Soybean Research and Promotion Council, D. W. Ragsdale and G. E. Heimpel, co PIs. 52,000 29,682
2005 Biological control of the soybean aphid, NCSRP (subcontract with Purdue, Year 1 of 3 funded, 3 year total reported), co-PI 652,217 0
2005 Management of soybean aphid in the North Central States, year 3 of 3 funded, total for year 3 reported, D. W. Ragsdale lead P.I. 191,655 67,631
2005 Expand host specificity testing of the Garlic Mustard
biocontrol agent Ceutorhynchus scrobicollis in Quarantine in MN, DNR with Ragsdale, Katovich, and Becker, co PIs 130,000 72,500
2005 Pyramiding PVY Management Tactics, Area II Potato Growers, E. B. Radcliffe (lead PI), J.A. Davis & D. W. Ragsdale 7,500 7,500
2006 USDA Special Research Grants Program, Potato Research. Potato variety development in the North Central Region, C.A. Thill MN project leader with J. Bradeen, D. W. Ragsdale, C. J. Rosen (2007 project lead by MSU with project lead rotating among 4 North Central States of MN, ND, WI and MI) 200,000 10,000
2006 Soybean Aphid Research in Minnesota, 2006. Minnesota Soybean Research & Promotion Council. Ragsdale (lead PI) and Heimpel, as a co-PI 50,000 35,2492006 Meteorological-based forecasts and targeted insecticide application to improve control of green peach aphid, NC-IPM, USDA, with MacRae (lead PI), Radcliffe, Olson and Ragsdale 41,391 0
2006 Soybean Aphid Management in the North Central States. NCSRP with Minnesota (Ragsdale) as lead PI, collaborating with 8 partner states, Year 1 of 3 200,000 37,694
2006 Grant-in-Aid, Chemical Company Product Testing, lead PI 17,500 17,500
2007 IGERT, NSF grant Invasive Species and Genotypes Total request, $3,193,585 (5 year total). Funded year 1 and subsequent years will be funded pending satisfactory progress. 598,606 0
2007 Soybean Aphid Management in the North Central States. NCSRP with Minnesota (Ragsdale) as lead PI, collaborating with 8 partner states, Year 2 of 3 266,617 52,265
2007 Soybean Aphid Research in Minnesota, 2007. Minnesota Soybean Research & Promotion Council. Ragsdale and Heimpel. 60,000 30,000
2007 Pyramiding novel sources of aphid, virus and late blight resistance into advanced breeding lines to create superior cultivars, Northern Plains Potato Growers Association and MN Area II Potato Research and Promotion Council, J.A. Davis (PI), E. B. Radcliffe, and D. W. Ragsdale 10,238 10,238
2007 Biological control of the soybean aphid, NCSRP (subcontract with R, O’Neil as project manager, Year 3of 3 requested (3 year total listed in funded proposals above), competitive renewal. G. Heimpel is lead MN scientist on project.
251,198 0
2007 Incorporating natural enemies into the economic thresholds for soybean aphid, with G.E. Heimpel as Co-PI, CFANS RARF, pre-proposal accepted 3/07 160,360 80,180
2008 Soybean Aphid Management in the North Central States, year 3 of 3, NCSRP, Ragsdale Project Manager (6 state grant) 199,691 50,066
2008 Selective and Irreversible Inhibitors of Aphid Acetylcholinesterase as Human-Safe Pesticides for Controlling Soybean and Green Peach Aphids in Minnesota, Minnesota Partnership Grant Program $698,736 181,768
2008 Biological Control of the Soybean Aphid, R. J. O’Neil, lead PI on a multistate proposal to NCSRP 250,000 0
2008 Soybean Aphid Research, 2008, Minnesota Soybean Research & Promotion Council w/ G. Heimpel & B. Potter 60,000 29,932
2009 Soybean Aphid Research, 2009, Minnesota Soybean Research & Promotion Council w. G. Heimpel and B. Potter 66,200 28,100
2009 Soybean Aphid: Management, Biocontrol, and Host Plant Resistance, D. W. Ragsdale, Project Manager, 12 state proposal, Year 1 of 3, total for 3 years of $1,364,903, U of MN share $103,925 439,778 36,969
2009 Monsanto, Screening Soybean Germplasm for Soybean Aphid Resistance and presence of soybean aphid biotypes. 7,475 7,475
2009 Monsanto RagI/seed trtmt protocol, dual locations. Research Contract 12,000 12,000
2009 Grant in Aid, Syngenta. Seed treatment for soybean aphid control 14,500 14,500
2009 Trap crop for Colorado potato beetles for resistance management, RRVPGA with Ian MacRae 12,000 0
TOTAL $13,442,804
4,172,750
Curriculum Committee, 1984-1989
Crops and Soils Planning Conference, 1984-1986
IPM major, coordinating committee 1982-1988
Coordinating committee for Science in Agriculture Major, 1988 - 1989
Advisor for Science in Agriculture Major, 1989 - 2000
Faculty Advisor for College of Agriculture Student Board - 1989
Biological Control Working Group & Steering Committee, 1989
Director of Undergraduate Studies, 1989-1996
Faculty Consultative Committee, elected for 2-year term 1990; chair, 1991-92
Professors in the Classroom, 1991-1996
Hamm Lecture & Scholarship Selection Committee, 1990-1992; 1993-present
University Senate & Twin Cities Campus Assembly, elected to 3-year term 1992
COA Decision Cases Steering Committee, 1992-1993
COA Planning Committee, 1992-1993
Koch Farm Committee, 1993-1995
COA Curriculum Committee, 1993-1996
COA Elections and Nominations, 1994-1996
Greenhouse Capitol Request Committee, co-chair, 1994
Coordinator for Area II Minnesota Potato Growers Association research committee, 1994-95
Coordinator of Biological Control Initiative, 1995-1998
St. Paul Greenhouse Complex Design Committee, 1996
ICR/IMG committee, COAFES with V. Morey chair, 1998
Plant Growth Facilities on the St. Paul Campus, Faculty Advisory Committee, 1998 - present
University Senate, COAFES senator, elected 1998-2000
COAFES, Center Review Task Force, appointed by Assoc. Dean Larson, 2000
COAFES, Faculty Consultative Committee, elected 1999, 2 year term, co-chair 2000-2001
COAFES, Promotion and Tenure committee, 2000, elected as chair for 2001
COAFES, Nine-month appointment task force, 2001-2002.
Appointed as Quarantine Officer for the High Security Containment Facility, 2003-2004
Appointed to BSL3 Facility Planning Committee, 2005
CFANS FCC, 3 year term, Co-Chair 2007-2008, member, 2006-2007 and 2008-2009
Appointed as Interim Head of Entomology May 2009
Search Committee for Insect Ecologists, 1983
Search Committee for Insect Physiologist, Dept. of Entomology, Chair, 1985
Search Committee for Insect Genetics/Toxicologist, Dept. of Entomology, 1986
Search Committee for Economic Entomologist for Vegetable Crops, 1988/1989
Curriculum Committee, Chair 1983-1989, Member 1989-1994, 1995-present
Greenhouse Committee, Chair 1983-1989
Long Range Planning Committee, Elected Member 1985-1987, 1987-1989, 1990-1999, 2001-2004, 2007-present
Seminar Committee, Member 1988-1999
Search Committee for Department Head, Member 1991
Search Committee for Apiculture Position, Chair 1991-1992
Department Head Review Committee, 1995
Search committee for Biological Control Assistant Professor, Chair 1996-1997
Awards Committee, 1997-1998, Chair
Venezuela: 1985, visited USDA facility and collected samples of Africanized honey bees for further analysis.
Morocco: 1987, visited doctoral student advisee at the Institut Agronomique et Veterinaire Hassan II to design field and laboratory experiments.
Niger: 1988, conduct field research on use of neem kernel extract for grasshopper control in the Sahel, University of Minnesota/AFGRO USAID/CICP contract.
Morocco: 1992, Doctoral Defense of Abdelhaq Hanafi
Morocco: 1992, advisor visit for Said Aboulfaraj
Wales, 1994, Invited Presentation at the second international conference on “The Ecology of Agricultural Pests: Biochemical Approaches”
Russia, 1995, consultant Conagra/CNFA/USAID, Potato Industry Restructuring Project, Diagnostics Laboratory and Seed Potato Production, February 1995.
Senegal, 1999, in-country team to develop a World Bank Proposal on agricultural development project.
China, 2001. Foreign exploration of parasitoids of the soybean aphid, Harbin and Jilin, 5-20 July 2001.
Japan, 2003. Foreign exploration of parasitoids of the soybean aphid, Japan 21-30 June, 2003.
Point Loma College
Genetics, Microbiology, Comparative Anatomy & General Zoology - Laboratory Assistant & Lecturer
Louisiana State University
Advanced Insect Ecology, General Microbiology - Laboratory TA and guest lecturer
University of Minnesota
Insects and Insect Management, ENT 3005 module
Field Crop Entomology, ENT 4005
Pests and Pest Management, AGRI 3001, 5 week lecture/lab module for AIM major
Insects and Society - ENT 1001 course coordinator 1989-1994
Insect Biology - ENT 3005 - S 94 & S95 course co-coordinator with R. Moon
Economic Entomology - ENT 1005
Insect in Relation to Plant Disease - Ent/PlPa 5215
Graduate Seminar - ENT 8300
Insect Pest Management, on line course, ENT 5211 (participant as instructor with E. B. Radcliffe).
Risk Analysis for Invasive Species and Genotypes, ISG 5010 (taught the management section with Frances Homans and Peter Sorenson).
Current Students (date started):
Ph.D.
Koch, Karrie, 8/2007 -
Heidel, Thelma, 8/2008 –
Ruge, Kirsten 6/2009 – (co-advised with R. Venette)
M.S.
Ph.D.
Flanders, K. 9/89 (co-advised with E. B. Radcliffe)
Hanafi, A. 6/92 (co-advised with E. B. Radcliffe)
DiFonzo, C. 6/95 (co-advised with E. B. Radcliffe)
Suranyi, R. 12/00 (co-advised with E. B. Radcliffe)
Ruano, Jorge 6/00 (co-advised with E. B. Radcliffe)
Nasruddin, A. 7/01 (co-advised with E. B. Radcliffe)
Longtine, C. 6/05 (co-advised with E. B. Radcliffe & F. I. Lauer) finally turned dissertation in to graduate school and received his diploma.
Skinner, L. 1/04
Zhu, M 12/04 (co-advised with E. B. Radcliffe and I. V. MacRae)
Carroll, M 5/05 (co-advised with I. V. MacRae and E. B. Radcliffe)
Hodgson, E. 6/05
Davis, J. A. 6/06 (co-advised with Radcliffe)
McCornack, B. 8/2007
Koch, K. 8/2007 - in progress
Heidel, T. 8/2008 – in progress
M.S.
Loughran, J. 6/85
Setiawan, D. 8/86
Hanafi, A. 8/87 (co-advised with E. B. Radcliffe)
Kjer, K. 10/88
Oien, C. 5/92
DiFonzo, C. 1/93 (co-advised with E. B. Radcliffe)
Connelly, M. 11/94 (co-advised with E. B. Radcliffe)
Davis, J. 12/04 (co-advised with E. B. Radcliffe)
Van Veldhuisen, Michele 4/07
Koch, K. 5/08
Thesis/Dissertation:
Isolation and Identification of Bacteria and Fungi Transmitted during Feeding and from Various Organs of Nezara viridula (L.).
Development and Use of an Enzyme Linked Immunosorbent Assay (ELISA) for the quantitative assessment of predation of Nezara viridula (L.) within a Soybean Agroecosystem.
Journal Articles:
Submitted for Peer Review: (4 Total)
Yoder, M., L.C. Skinner, and D.W. Ragsdale. 200X. Assessing the establishment of Galerucella calmariensis (L.) and G. pusilla (Duftschmidt) on purple loosestrife, Lythrum salicaria L. (in review)
Yoder, M., D.W. Ragsdale, L.C. Skinner, and Robert J. Bartelt. 200X. Evaluating post-release monitoring methods for Galerucella calmariensis and G. pusilla: biological control agents for purple loosestrife. (in review)
Yoder, M., S.A. Kells, L.C. Skinner, and D.W. Ragsdale. 200X. Evaluation of cold hardiness for Galerucella calmariensis (L.) and G. pusilla (Duftschmidt): natural enemies of purple loosestrife. (in review)
Davis, J.A., E. B. Radcliffe, and D. W. Ragsdale. 2007. Resistance to aphids, late blight and viruses in somatic fusions and crosses of Solanum tubersoum L. and Solanum bulbocastanum Dun. Theoretical and Applied Genetics (submitted, in review).
Published or in-press journal articles: (73 Total)
Davis, J.A., E. B. Radcliffe, C. A. Thill, and D. W. Ragsdale. 2008. Planter skips and impaired stand favors PVY spread in potato. Amer. J. Potato Res. 86(3): 203-208.
Yoder, M. V., L.C. Skinner, and D.W. Ragsdale. 2008. Common buckthorn, Rhamnus cathartica L.: Available feeding niches and the importance of controlling this invasive woody perennial in North America. Proc. International Biological Control of Weeds Symposium. pp. 232-237.
Carroll, M. W., E. B. Radcliffe, I. V. MacRae, D. W. Ragsdale, K. D. Olson, and T., Badibanga. 2008. Border Treatment to Reduce Insecticide Use in Seed Potato Production: Biological, Economic, and Managerial Analysis. Amer. J. Potato Res. 86(1): 31-37.
Katovich E.J.S., R.L. Becker, D.W. Ragsdale, and L.C. Skinner. 2008. Growth and Phenology of Three Lythraceae Species in Relation to Feeding by Galerucella calmariensis and Galerucella pusilla: Predicting Ecological Host Range from Laboratory Host Range Testing. Inv. Plant Sci Management. 1(2): 207-215.
McCornack, B. P., A. D. Costamagna, and D. W. Ragsdale. 2008. Within-Plant Distribution of Soybean Aphid (Hemiptera: Aphididae) and Development of Node-Based Sample Units for Estimating Whole-Plant Densities in Soybean. J. Econ. Entomol. 101(4): 1488-1500.
Radcliffe, E. B., D. W. Ragsdale, R. A. Suranyi, C. D. DiFonzo, and E. E. Hladilek. 2008. Aphid Alert: how it came to be, what it achieved, and why it proved unsustainable. In Areawide IPM: Theory to Implementation, Koul, O., G. W. Cuperus, and N.C. Elliott [eds.]. pp. 244-260. CAB International , Wallingford.
Davis, J.A., E. B. Radcliffe, and D. W. Ragsdale. 2007. Identifying and mapping resistance to green peach aphid, Myzus persicae (Sulzer), in potato. Am. J. Potato Res. 84: 86-87.
McCornack, B. P., R. L. Koch, and D. W. Ragsdale. 2007. A simple method for in-field sex determination of the multicolored Asian lady beetle (Coleoptera: Coccinellidae). J. Insect Science. 7: 10 http://www.insectscience.org/7.10/i1536-2442-2007-10.pdf
Ragsdale, D. W., B. P. McCornack, R. C. Venette, B. D. Potter, I. V. MacRae, E. W. Hodgson, M. E. O’Neal, K. D. Johnson, R. J. O’Neil, C. D. Difonzo, T. E. Hunt, P. Glogoza, and E. M. Cullen. 2007. Economic threshold for soybean aphid (Homoptera: Aphididae). J. Econ. Entomol. 100(4): 1258-1267.
Davis, Jeffrey A., Edward B. Radcliffe and David W. Ragsdale. 2007. Resistance to green peach aphid, Myzus persicae (Sulzer), and potato aphid, Macrosiphum euphorbiae (Thomas), in potato cultivars. Amer. J. Pot. Res. 84: 259-269.
Hodgson, E. W., B. P. McCornack, K. A. Koch, D. W. Ragsdale, K. D. Johnson, M. E. O’Neal, E. M. Cullen, H. J. Kraiss, C. D. DiFonzo, M. Jewett, and L. M. Behnken. 2007. Field validation of Speed Scouting for soybean aphid. Online Journal. Crop Manag. http://www.plantmanagementnetwork.org/cm/
Song, Feng, Scott M. Swinton, Christine DiFonzo, Matthew O’Neal and David W. Ragsdale. 2006. Profitability analysis of soybean aphid control treatments in three northcentral states. Staff Paper 2006-24 June 2006. peer reviewed staff paper
http://agecon.lib.umn.edu/cgi-bin/pdf_view.pl?paperid=23574&ftype=.pdf
Davis, J. A., E. B. Radcliffe, and D. W. Ragsdale. 2006. Modeling effects of high and fluctuating temperatures on green peach aphid, Myzus persicae (Hemiptera: Aphididae). Environ. Entomol. 35: 1461-1468.
McCornack, B. P. and D. W. Ragsdale. 2006. Efficacy of thiamethoxam to suppress soybean aphid populations in Minnesota soybean. Online Journal. Crop Management. http://dx.doi.org/10.1094/CM-2006-0915-01-RS
Zhu, M., E.B. Radcliffe, D.W. Ragsdale, I.V. MacRae and M.W. Seeley. 2006. Low-level jet streams associated with spring aphid migration and current season spread of potato viruses in the U.S. northern Great Plains. Agricultural Forest Meteorol. 138: 192-202. http://dx.doi.org/10.1016/j.agrformet.2006.05.001
Skinner, L.C., D.W. Ragsdale, R.W. Hansen, M.A. Chandler, and G. Spoden. 2006. Phenology of first and peak emergence of Aphthona lacertosa and A. nigriscutis introduced for biological control of leafy spurge, Euphorbia esula L. Biological Control. 37: 382-391. http://dx.doi.org/10.1016/j.biocontrol.2006.01.008
Carrillo, M.A., R.L. Koch, E.C. Burkness, K., Bennett, D.W. Ragsdale, and W.D. Hutchison. 2005. Overwintering of bean leaf beetle (Coleoptera: Chrysomelidae) in Minnesota: a revision of a predictive model for survival at low temperatures. Environ. Entomol. 34(6): 1395 – 1401. http://docserver.esa.catchword.org/deliver/cw/pdf/esa/freepdfs/0046225x/v34n6s4.pdf
Hodgson, E. W., R. L. Koch, and D. W. Ragsdale. 2005. Pan trapping for soybean aphid (Homoptera: Aphididae) in Minnesota soybean. J. Entomol. Sci. 40: 409-419
Hodgson, E. W., R. C. Venette, M. Abrahamson, and D. W. Ragsdale. 2005. Alate production of soybean aphid (Homoptera: Aphididae) in Minnesota. Environ. Entomol. 34: 1456-1463. http://docserver.esa.catchword.org/deliver/cw/pdf/esa/freepdfs/0046225x/v34n6s12.pdf
Davis, J. A., E. B. Radcliffe, D. W. Ragsdale. 2005. Soybean aphid, Aphis glycines Matsumura, a new vector of Potato Virus Y in potato. Amer. J. Potato Res. 81: 101-105.
McCornack, B. P., M. A. Carrillo, R. C. Venette, and D.W. Ragsdale. 2005. Physiological constraints to the overwintering distribution of the soybean aphid (Homoptera: Aphididae). Environ. Entomol. 34: 235-240. http://docserver.esa.catchword.org/deliver/cw/pdf/esa/freepdfs/0046225x/v34n6s12.pdf
Hodgson, E. W., E. C. Burkness, W. D. Hutchison, and D. W. Ragsdale. 2004. Enumerative and binomial sequential sampling plans for soybean aphid (Homoptera: Aphididae) in soybean. J. Econ. Entomol. 97(6): 2127-2136. http://docserver.esa.catchword.org/deliver/cw/pdf/esa/freepdfs/00220493/v97n6s48.pdf
McCornack, B., D. W. Ragsdale, and R. C. Venette. 2004. Demography of Soybean Aphid (Homoptera: Aphididae) at Summer Temperatures. J. Econ. Entomol. 97(3): 854-861. http://docserver.esa.catchword.org/deliver/cw/pdf/esa/freepdfs/00220493/v97n3s22.pdf
Skinner, L. C., D. W. Ragsdale, R.W. Hansen, M.A. Chandler and R.D. Moon. 2004. Temperature-dependent development of overwintering Aphthona lacertosa and A. nigriscutis (Coleoptera: Chrysomelidae), two flea beetles introduced for the biological control of leafy spurge, Euphorbia esula. Environ. Entomol. 33: 147-154. http://docserver.esa.catchword.org/deliver/cw/pdf/esa/freepdfs/0046225x/v34n6s12.pdf
Ragsdale, D. W., D. V. Voegtlin and R. J. O’Neil. 2004. Soybean Aphid Biology in North America. Annals Entomol. Soc. Amer. 97: 204-208. http://docserver.esa.catchword.org/deliver/cw/pdf/esa/freepdfs/00138746/v97n2s2.pdf
Heimpel G. E., D. W. Ragsdale, R. C. Venette, K. Hopper, R. J. O’Neil, C. Rutledge, and Z. Wu. 2004. Prospects for importation biological control of the soybean aphid: anticipating potential costs and benefits, Ann. Entomol. Soc. Amer. 97: 249-258. http://docserver.esa.catchword.org/deliver/cw/pdf/esa/freepdfs/00138746/v97n2s9.pdf
Wu, Z., D. Schenk-Hamlin, W. Zhan, D. W. Ragsdale and G. E. Heimpel. 2004. The soybean aphid in China – an historical review. Ann. Entomol. Soc. Amer. 97: 209-218. http://docserver.esa.catchword.org/deliver/cw/pdf/esa/freepdfs/00138746/v97n2s3.pdf
Venette, R. C and D. W. Ragsdale. 2004. Assessing the invasion by soybean aphid (Homoptera: Aphididae): where will it end? Ann. Entomol. Soc. Amer. 97: 219-226. http://docserver.esa.catchword.org/deliver/cw/pdf/esa/freepdfs/00138746/v97n2s4.pdf
Legg, D. E., S. M. Van Vleet, D. W. Ragsdale, R. W. Hansen, B., L. Skinner, T. R. Collier, and J. E. Lloyd. 2003. Roles of bootstrap resampling, measure of central tendency, and method for calculating thermal units when developing phenology models for pest management. International J. of Pest Management. 49: 319 – 325.
Novy, R.G., A. Nasruddin, D.W. Ragsdale, and E.B. Radcliffe. 2002. Genetic resistance to potato leafroll virus (PLRV), potato virus Y (PVY) and green peach aphid (Myzus persicae) in progeny of Solanum tuberosum. Amer J Potato Res 79:9-18.
Radcliffe, E. B., D. W. Ragsdale and R. A. Suranyi. 2002. IPM case studies – seed potato, In. Aphids as Crop Pests, H. F. van Emden and R. Harrington [eds.]. CABI Publishing, Wallingford, U.K. (accepted for publication, in press)
Ruano-Rossil, J. M., E. B. Radcliffe, D. W. Ragsdale. 2002. In: Dedryver, et. al. (eds), Disruption of entomopathogenic fungi of green peach aphid, Myzus persicae (Sulzer), by fungicides used to control potato late blight, Aphids in a New Millenium, 6th Int. Sympos. Aphids in a New Millennium, INRA, Versailles, pp. 365-370.
Radcliffe, E. B. and D. W. Ragsdale. 2002. Aphid transmitted potato viruses: the importance of understanding vector biology. Amer. J. Pot. Res. 79:353-386.
Legg, D. E., S. M. Van Vleet, D. W. Ragsdale, R. W. Hansen, B. Chen-Charpentier, L. Skinner, and J. E. Lloyd. 2002. Required number of location-years for estimating functional lower developmental thresholds and required thermal summations of insects: first emergence of Apthona nigriscutis Foudras as an example. International Journal of Pest Management. 48: 147-154.
Legg, D. E., S. M. Van Vleet, D. W. Ragsdale, R. W. Hansen, and J. E. Lloyd. 2002. Phenology Models for first emergence of aldult Apthona nigriscutis (Coleoptera: Chrysomelidae), a biological control agent of leafy spurge (Euphorbiaceae). Environ. Entomol. 31: 348-353.
Novy, R.G., A. Nasruddin, D.W. Ragsdale, and E.B. Radcliffe. 2002. Genetic resistance to potato leafroll virus (PLRV), potato virus Y (PVY), and green peach aphid (Myzus persicae) in progeny of Solanum etuberosum. Amer. J. Potato Research, 79:9-18.
Newman, R. M., D. W. Ragsdale, A. Milles, C. Oien. 2001. Overwinter habitat and the relationship of overwinter to in-lake densities of the milfoil weevil, Euhrychiopsis lecontei, a Eurasian watermilfoil biological control agent. J. Aquatic Plant Management, 39: 63-66.
Ragsdale, D. W., E. B. Radcliffe, and C. D. DiFonzo. 2001. Epidemiology and field control of PVY and PLRV, pp. 237-270. In G. Loebenstein and P. Berger, A. A. Brunt and R. Lawson [eds.] Virus and virus-like diseases of potatoes and production of seed-potatoes, Kluwer Academic Publishers, The Netherlands, 460 pp.
Stamm Katovich, E. J., Ragsdale, D. W., Skinner, L. C., and R. L. Becker. 2001. Effect of Galerucella spp. feeding on seed production in Lythrum salicaria. Weed Science 49: 190-104
Mazzei, K. C., R. M. Newman, A. Loos, & D. W. Ragsdale. 1999. Developmental rates of the milfoil weevil, Euhrychiopsis lecontei, and damage to Eurasian watermilfoil at constant temperatures. Biocontrol 16: 139-143.
Katovich, E. J., R. L. Becker, and D. W. Ragsdale. 1999. Impact of defoliation by the leaf beetles, Galerucella calmariensis and G. pusilla, and mechanical shoot clipping on survival of purple loosestrife (Lythrum salicaria) crowns. Weed Sci. 47:360-365
James, P. J., R. D. Moon, and D. W. Ragsdale. 1998. Serum and skin surface antibodies and their association with sheep biting lice, Bovicola ovis, on experimentally infested sheep. Med. Vet. Entomol. 12: 276-283.
Andow, D., D. Ragsdale, & B. Nyvall, eds. 1997. Ecological Interactions and Biological Control, Westview Press, 334pp.
Andow, D. A., D. W. Ragsdale, R. F. Nyvall. 1997. Biological control in cool temperate regions, pp. 1-28. In D. Andow, D. Ragsdale, & B. Nyvall, [eds.], Ecological Interactions and Biological Control, Westview Press, Boulder.
DiFonzo, C. D., D. W. Ragsdale, E. B. Radcliffe, N. C. Gudmestad & G. A. Secor. 1996. Seasonal abundance of aphid vectors of potato virus Y (PVY) in the Red River Valley of Minnesota and North Dakota. J. Econ. Entomol. 90: 824-831
DiFonzo, C. D, D. W. Ragsdale, E. B. Radcliffe, N. C. Gudmestad & G. A. Secor . 1996. Crop borders reduce potato virus Y incidence in seed potato. Annals Appl. Biol. 129: 289-302
Ragsdale, D. W. & C. T. Oien. 1996. An environmental risk assessment for release of an exotic microsporidium for European corn borer control in North America. Systematics Association, Special Volume XX:401-417.
DiFonzo, C. D., D. W. Ragsdale, & E. B. Radcliffe. 1995. Potato leafroll virus spread in differentially resistant potato cultivars under varying aphid densities. Am. Pot. J. 72: 119-132.
Hanafi, A., E. B. Radcliffe, & D. W. Ragsdale. 1995. Spread and control of potato leafroll virus in the Souss-Massa valley of Morocco. Crop Protect. 14: 145-153.
Mahr, S. E., J. A. Wyman, E. B. Radcliffe, C. W. Hoy and D. W. Ragsdale. 1995. Chapter 5, Potato, pp. 63-76 in Vegetable Insect Management with Emphasis on the Midwest, R. E. Foster and B. R. Flood, eds., Meister Publishing Co., Willoughby
Radcliffe, E. B., G. Ouedraogo, S. E. Patten, D. W. Ragsdale, and P. P. Strzok. 1995. Neem in Niger: A new context for a system of indigenous knowledge, pp.35-70. In D. M. Warren, L. J. Slikkerveer, and D. Brokensha, [eds.], The Cultural Dimension of Development, Indigenous Knowledge Systems. Intermediate Technology Publications, London.
DiFonzo, C. D., D. W. Ragsdale, & E. B. Radcliffe. 1994. Susceptibility to potato leafroll virus: interacting effect of cultivar, plant age at inoculation, and inoculation pressure on tuber infection. Plant Dis. 78: 1173-1177.
Radcliffe, E. B., D. W. Ragsdale, K. F. Flanders. 1994. Management of aphids and leafhoppers, pp 117-126. In R. C. Rowe [ed.] Potato health management, American Phytopath. Society Plant Health Management Series, APS Press.
Oien, C. T. & D. W. Ragsdale. 1993. Susceptibility of nontarget hosts to Nosema furnacalis (Microsporida: Nosematidae), a potential biological control agent of the European corn borer. Biol. Con. 3: 323-328.
Radcliffe, E. B. & D. W. Ragsdale. 1993. Insect Pests of Potato in Minnesota and North Dakota, pp. 77-84. In H. L. Bissonnette, D. Preston, & H. A. Lamey [eds.], Potato Production and Pest Management in North Dakota and Minnesota. Joint NDSU/UM Extension Bulletin 26.
Oien, C. T. & D. W. Ragsdale. 1992. A species-specific enzyme-linked immunosorbent assay for Nosema furnacalis (Microspora: Nosematidae). J. Invert. Pathology 60: 84-88.
Ragsdale, D. W., E. B. Radcliffe, C. D. DiFonzo, & M. S. Connelly. 1992. Action Thresholds for an Aphid Vector of Potato Leafroll Virus. In G. W. Zehnder, R. K. Jansson, M. L. Powelson, & K. V. Raman [eds.] "Advances in Potato Pest Management".
Radcliffe, E. B., K. F. Flanders, D. W. Ragsdale, & D. M. Noetzel. 1991. Potato Insects -- Pest Management Systems for Potato Insects, pp. 586-621, In: D. Pimentel [ed.], CRC Handbook of Pest Management in Agriculture, Boca Raton, FL.
Flanders, K. L., E. B. Radcliffe, & D. W. Ragsdale. 1991. Potato leafroll virus spread in relation to densities of green peach aphid (Homoptera: Aphidiae): implications for management thresholds for Minnesota seed potatoes. J. Econ. Entomol. 84: 1028-1036.
Flanders, K. L., D. W. Ragsdale, & E. B. Radcliffe. 1990. Use of enzyme-linked immunosorbent assay to detect potato leafroll virus in field grown potato, cv. Russet Burbank. Amer. Potato J. 67: 589-602.
Ragsdale, D. W. & K. M. Kjer. 1989. Diagnosis of tracheal mite (Acarapis woodi Rennie) parasitism of honey bees using a monoclonal based enzyme-linked immunosorbent assay. Am. Bee J. 129: 550-553.
Furgala, B. F, S. Aboulfaraj, D. W. Ragsdale, and D. Hyser. 1989. Some effects of the honey bee tracheal mite (Acarapis woodi) on the non-migratory wintering honey bee (Apis mellifera) colonies in east central Minnesota. Am. Bee J. 129: 195-197.
Kjer, K. M., D. W. Ragsdale, and B. Furgala. 1989. A retrospective and prospective overview of the honey bee tracheal mite, Acarapis woodi R. part 2 of a two-part series. Am. Bee J. 129: 112-115.
Kjer, K. M., D. W. Ragsdale, and B. Furgala. 1989. A retrospective and prospective overview of the honey bee tracheal mite, Acarapis woodi R. part 1 of a two-part series. Am. Bee J. 129: 25-28.
Hanafi, A., E. B. Radcliffe, and D. W. Ragsdale. 1989. Spread and control of potato leafroll virus in Minnesota. J. Econ. Entomol. 82: 1201-1206.
Setiawan, D. P. and D. W. Ragsdale. 1987. Use of aluminum-foil and oat-straw mulches for controlling aster leafhopper, Macrosteles fascifrons (Homoptera: Cicadellidae), and aster yellows in carrot. Great Lakes Entomol. 20: 103-109.
Ragsdale, D. W. and B. Furgala. 1987. A seriological approach to the detection of Acarapis woodi parasitism of Apis mellifera. Apidologie 18: 1-10.
Ragsdale, D. W. and B. Furgala. 1986. Progress on New Detection Methods for Acarapis woodi. Proceeding of the Honey Bee Tracheal Mite (Acarapis woodi, R.) Scientific Symposium. July 8-9 1986. Saint Paul, MN.
Loughran, J. C, and D. W. Ragsdale. 1986. Medina n. sp. (Diptera: Tachinidae): A new parasitoid of the bean leaf beetle, Cerotoma trifurcata (Coleoptera: Chrysomelidae). J. Kansas Entomol. Soc. 59: 468-473.
Loughran, J. C. and D. W. Ragsdale. 1986. Life cycle of the bean leaf beetle, Cerotoma trifurcata (Coleoptera: Chrysomelidae), in southern Minnesota. Ann. Entomol. Soc. Am. 79: 34-38.
Ragsdale, D. W., A. D. Larson, and L. D. Newsom. 1981. Quantitative assessment of the predators of Nezara viridula eggs and nymphs within a soybean agroecosystem using an ELISA. Environ. Entomol. 10: 402-405.
Hranitzky, K. W., A. D. Larson, D. W. Ragsdale, and R. J. Siebling. 1980. Isolation of 01 serovars of Vibrio cholerae from water by serologically specific method. Science 210: 1025-1026.
Ragsdale, D. W., A. D. Larson, and L. D. Newsom. 1979. Microorganims associated with feeding and from various organs of Nezara viridula. J. Econ. Entomol. 72: 725-727.
Ragsdale, D. W. and B. Furgala. 1986. Progress on New Detection Methods for Acarapis woodi. Proceeding of the Honey Bee Tracheal Mite (Acarapis woodi, R.) Scientific Symposium. July 8-9 1986. Saint Paul, MN.
Radcliffe, E. B., K. F. Flanders, D. W. Ragsdale, & D. M. Noetzel. 1991. Potato Insects -- Pest Management Systems for Potato Insects, pp. 586-621, In: D. Pimentel [ed.], CRC Handbook of Pest Management in Agriculture, Boca Raton, FL.
Ragsdale, D. W., E. B. Radcliffe, C. D. DiFonzo, & M. S. Connelly. 1992. Action Thresholds for an Aphid Vector of Potato Leafroll Virus. In G. W. Zehnder, R. K. Jansson, M. L. Powelson, & K. V. Raman [eds.] "Advances in Potato Pest Management".
Radcliffe, E. B. & D. W. Ragsdale. 1993. Insect Pests of Potato in Minnesota and North Dakota, pp. 77-84. In H. L. Bissonnette, D. Preston, & H. A. Lamey [eds.], Potato Production and Pest Management in North Dakota and Minnesota. Joint NDSU/UM Extension Bulletin 26.
Radcliffe, E. B., D. W. Ragsdale, K. F. Flanders. 1994. Management of aphids and leafhoppers, pp 117-126. In R. C. Rowe [ed.] Potato health management, American Phytopath. Society Plant Health Management Series, APS Press.
Mahr, S. E., J. A. Wyman, E. B. Radcliffe, C. W. Hoy and D. W. Ragsdale. 1995. Chapter 5, Potato, pp. 63-76 in Vegetable Insect Management with Emphasis on the Midwest, R. E. Foster and B. R. Flood, eds., Meister Publishing Co., Willoughby
Radcliffe, E. B., G. Ouedraogo, S. E. Patten, D. W. Ragsdale, and P. P. Strzok. 1995. Neem in Niger: A new context for a system of indigenous knowledge, pp.35-70. In D. M. Warren, L. J. Slikkerveer, and D. Brokensha, [eds.], The Cultural Dimension of Development, Indigenous Knowledge Systems. Intermediate Technology Publications, London.
Andow, D., D. Ragsdale, & B. Nyvall, eds. 1997. Ecological Interactions and Biological Control, Westview Press, 334 pp.
Andow, D. A., D. W. Ragsdale, R. F. Nyvall. 1997. Biological control in cool temperate regions, pp. 1-28. In D. Andow, D. Ragsdale, & B. Nyvall, [eds.], Ecological Interactions and Biological Control, Westview Press, Boulder.
Ragsdale, D. W., E. B. Radcliffe, and C. D. DiFonzo. 2001. Epidemiology and Field Control of PVY and PLRV, pp. 237-270. In G. Loebenstein and P. Berger, A. A. Brunt and R. Lawson [eds.] Virus and virus-like diseases of potatoes and production of seed-potatoes, Kluwer Academic Publishers, The Netherlands, 460 pp.
Ragsdale David W., Edward B. Radcliffe, and Kathy L. Flanders. 2007. Managing Aphids and Leafhoppers. In D. Johnson, [ed]. Potato Health Management, American Phytopath. Society Plant Health Management Series, APS Press, St. Paul, MN.
Andow, D. W., G.P. Fitt, E.E. Grafius, R.E. Jackson, E.B. Radcliffe, D.W. Ragsdale, L. Rossiter. 2007. Pesticide and Transgenic Plant Resistance Management in the Field, In R. Hollingworth, D. Mota-Sanchez and M.E. Whalon [eds]. Global Pesticide Resistance in Arthropods, Management, CAB International, Wallingford, UK.
Ragsdale, David W. and Karrie A. Koch. 2008. Fungicides: Do They Adversely Affect Beneficial Insect Pathogens in Multiple Cropping Systems? Proceedings of the 2008 Illinois Crop Protection Technology Conference, pp. 57-66. http://www.ipm.uiuc.edu/education/proceedings/icptcp2008.pdf
Radcliffe, E. B., D. W. Ragsdale, and R. A. Suranyi. 2008. IPM Case Studies: Seed Potato. In: Aphids as crop pests, H.F. van Emden and R. Harrington (eds.). CAB International, 717 pp.
Radcliffe, E. B., D. W. Ragsdale, R. A. Suranyi, C. D. DiFonzo, and E. E. Hladilek. 2008. Aphid Alert: how it came to be, what it achieved, and why it proved unsustainable. In Areawide IPM: Theory to Implementation, Koul, O., G. W. Cuperus, and N.C. Elliott [eds.]. CAB International. (in press)
Davis, J. A., E. B. Radcliffe, W. Schrage and D. W. Ragsdale. 2008. Seed potato production IPM, In: E.B. Radcliffe, W. D. Hutchison, and R. E. Cancelado (eds.), Insect Pest Management, Cambridge University Press.
Ragsdale, D. W., K. A. Koch, and C. Grau. 2008. Secondary Effects of Fungicides, Chapter 14 In Using Foliar Fungicides to Manage Soybean Rust, A. Dorrance, M. Draper, and D. Hershman, [eds.], Land-Grant University Cooperating NCERA-208 and OMAF, SR-2008. pp. 83-85. http://oardc.osu.edu/soyrust/
Electronic Publications (11 Total)
Hodgson, E. W., B. P. McCornack and D. W. Ragsdale. 2004. Speed scouting for soybean aphid. http://www.soybeans.umn.edu/crop/insects/aphid/aphid_sampling.htm.
Olson, K., T. Badibanga, E. Radcliffe, M. Carroll, I. MacRae, and D. Ragsdale. Economic analysis of using a border treatment for reducing organophosphate use in seed potato production. Staff. Paper P04-8, Department of Applied Economics, University of Minnesota, 2004.
Radcliffe, E. B., D. W. Ragsdale, and R. Suranyi. 2000. Aphid Alert prepares watchful growers of Valley virus vector status. Valley Potato Grower 65(115): 28-30.
Radcliffe, E. B., Suranyi, R., D. W. Ragsdale, I. MacRae, and B. Lockhart. 2000. Aphid Alert, 2000, 12 weekly articles written and distributed to potato growers in Minnesota and North Dakota. <http://ipmworld.umn.edu/alert.htm>
Radcliffe, E. B., Suranyi, R., D. W. Ragsdale, I. MacRae, and B. Lockhart. 1999. Aphid Alert: A research/outreach initiative addressing potato virus problems in the northern Midwest USA. <http://www.potatocongress.org/articles/september99.htm>
Ragsdale, D. W. Colorado Potato Beetle, for Midwest VegEdge: Vegetable IPM Resource for theMidwest http://www3.extension.umn.edu/vegipm/vegpest/cpb.htm. 1999
Radcliffe, E. B., Suranyi, R., D. W. Ragsdale, I. MacRae, and B. Lockhart. 1999. Aphid Alert, 1999, 14 weekly articles written and distributed to potato growers in Minnesota and North Dakota. <http://ipmworld.umn.edu/alert.htm>
Radcliffe, E. B., A. Lagnaoui, and D. W. Ragsdale. 1999. Fungicides Impact Aphid Control. <http://ipmworld.umn.edu/chapters/rrvpga.htm>
Radcliffe, E. B., Suranyi, R., D. W. Ragsdale, I. MacRae, and B. Lockhart. 1999. Aphid Alert: A research/outreach initiative addressing potato virus problems in the northern Midwest. <http://ipmworld.umn.edu/chapters/aphidalert.htm>
Radcliffe, E. B., Suranyi, R., D. W. Ragsdale, I. MacRae, and B. Lockhart. 1998. Aphid Alert, 1998, 7 articles written between July and September 1998 and distributed to potato growers in Minnesota and North Dakota. < http://ipmworld.umn.edu/aphidalert/alert1.htm>
DiFonzo, C. D., D. W. Ragsdale, and E. B. Radcliffe. 1997. Integrated Management of PLRV and PVY in Seed Potato, with Emphasis on the Red River Valley of Minnesota and North Dakota. < http://ipmworld.umn.edu/chapters/difonzo.htm>
Popular,Trade and Extension Publications (24 Total)
Ragsdale, D. W. and W. S. Cranshaw. 1984. Soybean insect control. Entomology Fact Sheet No. AG-FS-2233
Ragsdale, D. W. 1984. Bean leaf beetle and yellow woollybear control in soybean. Minnesota Retail Dealer and Pesticide Applicator Conference. Special Report.
Ragsdale, D. W. 1984. Aster leafhopper and aster yellows control in carrot. Minnesota retail dealer and pesticide applicator conference. Special Report
Hanafi, A., E. B. Radcliffe, & D. W. Ragsdale. 1986. Control of green peach aphid and its effect on the incidence of potato leafroll virus. Proceedings Annual Potato Research Planning and Reporting Conf., Red River Valley Potato Growers Assoc. 185-186.
Radcliffe, E. B., D. M. Noetzel, P. M. Ives, and D. W. Ragsdale. 1986. Potato insects. Valley Potato Grower 52(101): 16-17.
Ragsdale, D. W. & E. B. Radcliffe. 1992. PVY Research: aphid trapping network. Valley Potato Grower 58(101): 8-9.
Ragsdale, D. W. & E. B. Radcliffe. 1992. Aphid Research in the Red River Valley. Valley Potato Grower 58(105): 20-21.
DiFonzo, C. D., D. W. Ragsdale, & E. B. Radcliffe. 1993. PVY Epidemiology and Control in the Red River Valley. Valley Potato Grower 58(112):17-19.
Ragsdale, D. W., E. B. Radcliffe, C. D. DiFonzo. 1994. Crop borders - a way to prevent spread of PVY. Valley Potato Grower 60(101): 30, 31-33.
Managing viruses in seed potato: Using crop borders to reduce potato virus Y. C. D. DiFonzo, D. W. Ragsdale, E. B. Radcliffe, N. C. Gudmestad & G. A. Secor . 1995. IPM Results Minnesota.
Late blight fungicides have an impact on aphid control. Ted Radcliffe & Dave Ragsdale. 1996. Valley Potato Grower 61: 16-17, 21.
Suranyi, R. A., E. B. Radcliffe, D. W. Ragsdale. 1997. Alternative strategies to control Colorado potato beetles. Valley Potato Grower 62(112): 22, 28.
Ragsdale, D. W. 1997. Late Blight Fungicides Linked to Increases in Green Peach Aphids in Potato, Feature Article. Midwest Biological Control Newsletter 4(12): 1-3, 7.
Ragsdale, D. W. 1998. Classical Biological Control of Purple Loosestrife in the Upper Midwest. Feature Article, Midwest Biological Control Newsletter 5(1): 1-3.
Loos, A. and D. W. Ragsdale. 1998. Biocontrol of Purple Loosestrife: A Guide for rearing leaf-feeding beetles. University of Minnesota Extension Service. FO-7080-D.
Loos, A. and D. W. Ragsdale. 1998. CUES for Biological Control of Purple Loosestrife, slide set and narrative. University of Minnesota Extension Service. SS-7081-GO
Ragsdale, D. W. and E. B. Radcliffe. 1998. Aphids cause big problems for industry. Valley Potato Grower 63(110): 4, 6, 31.
Radcliffe, E. B. and D. W. Ragsdale. 1998. Initiative to address viruses in seed potatoes. Valley Potato Grower 63(113): 20-21.
Ragsdale, D. W. and E. B. Radcliffe. 1998. Potato Beetles. Potato Production and Pest Management in ND and MN (AG BU6109 U of MN Pub.). No. 510.
Ragsdale, D. W. and E. B. Radcliffe. 1999. A new threat from an old pest: green peach aphid. Valley Potato Grower 64(110): 12, 14.
Suranyi, R., C. Longtine, D. Ragsdale, and E. Radcliffe. 1999. Controlling leafhoppers with below-label rates. Valley Potato Grower 64(113): 11-13, 16.
Radcliffe, E. B., D. W. Ragsdale, and R. Surany. 2000. Aphid Alert prepares watchful growers of Valley virus vector status. Valley Potato Grower 65(115): 28-30.
Carroll, M. W., E. B. Radcliffe, I. V. MacRae, D. W. Ragsdale, K. Olson, and R. A. Suranyi. 2004. Reducing organophosphate use in seed potato production: targeted insecticide application for green peach aphid control. Valley Potato Grower 146 (69): 5, 17.
Olson, Kent D., Edward B. Radcliffe, Thaddee Badibanga, and David W. Ragsdale. 2006. Survey shows Using Crop Borders increases probability of passing winter test for Potato Virus Y (PVY) in Seed Potatoes. Valley Potato Grower 71 (166): 18.
Published Abstracts and Summaries (43 Total)
Ragsdale, D. W. 1982. Use of an ELISA for detection of bean pod mottle virus within its vector, the bean leaf beetle. Abstracts North Cen. Branch Entomol. Soc. Amer. 49.
Ragsdale, D. W. 1984. Bean pod mottle virus - a yield loss analysis. Abstracts North Cen. Branch Entomol. Soc. Amer. Abstracts North Cen. Branch Entomol. Soc. Amer. 177.
Loughran, J. C. and D. W. Ragsdale. 1984. Bean leaf beetle life cycle in southern Minnesota. Abstract North Cen. Branch Entomol. Soc. Amer. 178.
Ragsdale, D. W. 1987. Effect of storage conditions and time on serological evaluation of potato foliage for potato leafroll virus. Potato Assoc. Am. 71st Annual Meeting, St. Paul.
Ragsdale, D. W. & K. M. Kjer. 1990. Evaluation of an Immunological test for diagnosing low level tracheal mite parasitism, In Proceedings of the honey bee tracheal mites Symposium 2.
Flanders, K. L., D. W. Ragsdale, and E. B. Radcliffe. 1990. Spread of potato leafroll virus in relation to densities of green peach aphid: implications for management thresholds for Minnesota seed potatoes, pp. 320, In D. C. Peters, J. A. Webster, & C. S. Chlouber, [eds.] Proceedings: Aphid-plant interactions: populations to molecules. Oklahoma Agricultural Experiment Station, MP-132, Stillwater, Oklahoma.
Ragsdale, D. W., E. B. Radcliffe, C. D. DiFonzo, & M. S. Connelly. 1992. Action thresholds for aphid vectors of potato virus diseases. In Proceedings: Agricultural Research Service Cooperators Meeting: Colorado Potato Beetle and Aphids Research, pp. 100-102.
Longtine, C. A., E. B. Radcliffe, F. I. Lauer, & D. W. Ragsdale. 1992. Incorporation of resistance to green peach aphid, potato leafroll virus, and potato virus Y. In Proceedings: Agricultural Research Service Cooperators Meeting: Colorado Potato Beetle and Aphids Research, pp. 65-66.
Longtine, C. A., E. B. Radcliffe, F. I. Lauer & D. W. Ragsdale. 1993. Incorporation of resistance to Myzus persicae, potato leafroll virus and potato virus Yo from exotic Solanum germplasm. Aphid Resistance Newsletter 7:14-16.
DiFonzo, C. D., D. W. Ragsdale, E. B. Radcliffe, N. C. Gudmestad, G. Secor. 1994. Use of crop borders to reduce potato virus Y incidence in Red River Valley seed potato. Am. Pot. J. 71: 669-670.
Longtine, C., E. B. Radcliffe, F. Lauer, D. W. Ragsdale. 1994. Use of exotic Solanum species for control of green peach aphid, potato leafroll virus, and potato virus Y. Am. Pot. J. 71: 682-683.
Ragsdale, D. W. 1995. Crop borders - a novel approach to controlling PVY spread in seed potato. New Brunswick Potato Growers Conference and Trade Show, Feb 15-16, Perth-Andover, New Brunswick, Canada
DiFonzo, C. D., D. W. Ragsdale, E. B. Radcliffe. 1996. Use of reflective mulches to reduce potato virus Y Potyvirus incidence in seed potato. Congress of Israeli Phytopathological Society. July 1996.
Newman, R. M., L. M. Maher, D. D. Biesboer, K. L. Holmberg, B. G. Penner, J. A. Perry, and D. W. Ragsdale. 1996. Changes in Eurasian watermilfoil density associated with natural populations of the milfoil weevil Euhrychiposis lecontei. North American Lake Management Society
Suranyi, R. A., D.W. Ragsdale, E.B. Radcliffe and B. E. Lockhart. 1998. Seasonal abundance of aphid vectors of potato viruses in the Red River Valley. N. C. Branch Entomol. Soc. Amer. Program Abstracts, 54:th Annual Meeting.
Katovich E. J. S., A. J. Milles, D. W. Ragsdale and R. L. Becker. 1999. Feeding and oviposition preference of Galerucella spp. in Lythrum.. University of Minnesota, St. Paul, MN, International Symposium on Weed Biocontrol, Bozeman, Montana, July 1999.
Novy, R., A. Nasruddin, D. W. Ragsdale,and E. B. Radcliffe. 1999. Introgression of virus resistance from solanum etubersum to cultivated potato, American Journal of Potato Research 76: 380 (abstract).
Thill, C. A. E. B. Radcliffe and D. W. Ragsdale. 1999. Breeding for potato leafhopper resistance using wild Solanum species," American Journal of Potato Research 76: 3805 (abstract).
Thill, C. A., E. B. Radcliffe, D. W. Ragsdale, R. E. Hanneman, Jr., and J. B. Bamberg. 1999. The identification of aphid resistant 4X potato germplasm for use in breeding. 1999. American Journal of Potato Research 76: 385-86 (abstract).
Suranyi, R., I. V. MacRae, D. W. Ragsdale, and E. B. Radcliffe. 2000. Site specific management of green peach aphid in seed potatoes. Amer. J. Potato Res. 77: 420 (abstract)
Newman, R.M., D.W. Ragsdale, A. Loos and J.L. Foley. 2001. Factors limiting populations of the native milfoil weevil, a control agent of Eurasian watermilfoil. X International Symposium on the Biological Control of Weeds. 6 July 1999, Bozeman, MT. (invited for talk). [Pages 427-428 in N.R. Spencer, ed. 2000. Proceedings of the X International Symposium on the Biological Control of Weeds, Montana State University, Bozeman, MT]
Carroll, Matthew W., Robert A. Suranyi, M., Ian V. MacRae, D. W. Ragsdale, & Edward B. Radcliffe. 2001. Site-specific management of green peach aphid, Myzus persicae (Sulzer), in potato. Department of Entomology, University of Minnesota, St. Paul, MN, USA
Ruano-Rossil, Jorge M., Edward B. Radcliffe, & David W. Ragsdale. 2001. Disruption of entomopathogenic fungi of green peach aphid, Myzus persicae (Sulzer), by fungicides used to control potato late blight. Department of Entomology, University of Minnesota, St. Paul, MN, USA
Suranyi, Robert A., David W. Ragsdale, Edward B. Radcliffe, & Ian V. MacRae. 2001. APHID ALERT: Region monitoring of virus vector aphid species in the seed potato production of Minnesota and North Dakota. Department of Entomology, University of Minnesota, Saint Paul, MN, USA.
Newman, R.M., D.W. Ragsdale, A. Loos and J.L. Foley. 2001. Factors limiting populations of the native milfoil weevil, a control agent of Eurasian watermilfoil. X International Symposium on the Biological Control of Weeds. 6 July 1999, Bozeman, MT. (invited for talk). [Pages 427-428 in N.R. Spencer, ed. 2000. Proceedings of the X International Symposium on the Biological Control of Weeds, Montana State University, Bozeman, MT]
Carroll, Matthew W., Robert A. Suranyi, M., Ian V. MacRae, D. W. Ragsdale, & Edward B. Radcliffe. 2001. Site-specific management of green peach aphid, Myzus persicae (Sulzer), in potato. Department of Entomology, University of Minnesota, St. Paul, MN, USA
Ruano-Rossil, Jorge M., Edward B. Radcliffe, & David W. Ragsdale. 2001. Disruption of entomopathogenic fungi of green peach aphid, Myzus persicae (Sulzer), by fungicides used to control potato late blight. Department of Entomology, University of Minnesota, St. Paul, MN, USA
Suranyi, Robert A., David W. Ragsdale, Edward B. Radcliffe, & Ian V. MacRae. 2001. APHID ALERT: Region monitoring of virus vector aphid species in the seed potato production of Minnesota and North Dakota. Department of Entomology, University of Minnesota, Saint Paul, MN, USA.
Zhu, M., E.B. Radcliffe, D.W. Ragsdale and I.V. MacRae. 2002. The possible source areas and over-wintering hosts of green peach aphid, Myzus persicae, in the Red River Valley, pp. 249-251, In: 15th Conference on Biometerology and Aerobiology. American Meterological Society, Boston, MA
Venette, R.C., D.W. Ragsdale, K.R. Ostlie, I. MacRae, W.D. Hutchison and B. Potter. 2003. The Minnesota Experience with Soybean Aphid. Proceedings for the Midwest Food Processors Association Processing Crops Conference, February 2003.
Davis, J. A., E. B. Radcliffe, and D. W. Ragsdale. 2004. A new vector of PVY: Soybean aphid, Aphis glycines (Matsumura). Amer. J. Potato Res. 81: 53-54.
Radcliffe, Edward, Matthew Carroll, Ian MacRae, David Ragsdale, Kent Olson, and Robert Suranyi. 2004. Targeted insecticide application for control of Myzus persicae (Sulzer) in N. American seed potato production. International Congress of Entomology.
Heimpel, G.E., P. Porter, D.W. Ragsdale & B. Potter. 2004. Winter cover crops and biological control of soybean aphid. 2nd International Symposium on Arthropod Biological Control (Davos, Switzerland, September 2005.
Novy, R.G., Alvarez, J.M., Corsini, D.L., Nasruddin, A., Radcliffe, E.B., Ragsdale, D.W. 2004. Resistance to PVY, PLRV, PVX, Green Peach Aphid, Colorado Potato Beetle, and Wireworm in the Progeny of a Tri-Species Somatic Hybrid. American Journal of Potato Research. 81 (1):77-78.
Skinner, L.C. and D.W. Ragsdale. 2005. Future needs in developing biological control for buckthorn. 2005. In L.C. Skinner (ed), Proceedings: Symposium on the Biology, Ecology and Management of Garlic Mustard (Alliaria petiolata) and European Buckthorn (Rhamnus cathartica) 17-18 May 2005, University of Minnesota, St. Paul, Minnesota, USA. Pp. 62-63.
Katovich, E., R.L. Becker, D.W. Ragsdale and L.C. Skinner. 2005. Host range testing of garlic mustard (Alliaria petiolata) biocontrol insects in Minnesota. In L.C. Skinner (ed), Proceedings: Symposium on the Biology, Ecology and Management of Garlic Mustard (Alliaria petiolata) and European Buckthorn (Rhamnus cathartica) 17-18 May 2005, University of Minnesota, St. Paul, Minnesota, USA. Pp. 17-18.
Van Veldhuizen, M., D.W. Ragsdale and L.C Skinner. 2005. Survey of insect fauna on common buckthorn, Rhamnus cathartica, in Minnesota. In L.C. Skinner (ed), Proceedings: Symposium on the Biology, Ecology and Management of Garlic Mustard (Alliaria petiolata) and European Buckthorn (Rhamnus cathartica) 17-18 May 2005, University of Minnesota, St. Paul, Minnesota, USA. pp. 58-61.
Olson, Kent D., Thaddee Badibanga, Edward B. Radcliffe, and David W. Ragsdale. 2006. The Value of Crop Borders for Management of Potato Virus Y (PVY) in Seed Potatoes. International Association of Agricultural Economists, Brisbane, Australia, August 12-18, 2006
Ragsdale, D. W., E.W. Hodgson, B.P. McCornack, K.A. Koch, R.C. Venette, and B.D. Potter. 2006. Soybean Aphid and the Challenge of Integrating Recommendations within an IPM System, Illinois Crop Protection Technology Conference 2006 Proceedings. pp. 103-110.
Davis, J. A., E. B. Radcliffe, D. W. Ragsdale, and C. A. Thill. 2006. Identifying resistance to aphids in crosses with somatic fusions of Solanum tuberosum L. and Solanum bulbocastanum Dun. Am. J. Pot. Res. 83: 106.
Davis, J. A., E. B. Radcliffe, and D. W. Ragsdale. 2006. Crop borders revisited. A. J. Potato Res. 83: 107.
Carroll, M. W., E. B. Radcliffe, I. V. MacRae, D. W. Ragsdale and K. D. Olson. 2006. Border application to reduce insecticide use in seed potato production: a biological, economic and managerial analysis. Am. J. Potato. Res. 83: 129-130.
Zhu, M. E. B. Radcliffe, D. W. Ragsdale, and I. V. MacRae. 2006. Migration of green peach aphid, Myzus persicae (Sulzer) and spread of potato leafroll virus in the Red River Valley. Am. J. Pot. Res. 83: 130.
Katovich, E.J.S., R. L. Becker, L.C. Skinner, and D.W. Ragsdale. 2008. Growth and phenology of three Lythraceae species in relation to feeding by the leaf beetles Galerucella spp. XII International Symposium on Biological Control of Weeds, Le Grande Motte, France, April 2007. CAB International, pp. 358.
Skinner, L.C., D. W. Ragsdale. 2008. Population dynamics and long-term effects of Galerucella spp. on purple loosestrife, Lythrum salicaria, and non-target native plant communities in Minnesota. International Symposium on Biological Control of Weeds, Le Grande Motte, France, April 2007. CAB International, pp. 643.
Becker, R.L., D.W. Ragsdale, D. Sreenivasam, J. Heil, Z. Wu, M. Hanks, E.J.S. Katovich, and L.C. Skinner. 2008. The new quarantine facility, St. Paul, MN USA. International Symposium on Biological Control of Weeds, Le Grande Motte, France, April 2007. CAB International, pp. 395.
Ragsdale, David W. and Karrie A. Koch. 2008. Fungicides: Do They Adversely Affect Beneficial Insect Pathogens in Multiple Cropping Systems? Proceedings of the 2008 Illinois Crop Protection Technology Conference, pp. 57-66.
Miscellaneous Publications (57 Total)
Ragsdale, D. W. and J. C. Loughran. 1984. Bean leaf beetle and potato leafhopper control in soybean, 1983. Insect. Acara. Tests. 9:313
Ragsdale, D. W., E. B. Radcliffe, and J. C. Loughran. 1984. Aster leafhopper and aster yellows control in carrot, 1983. Insect. Acara. Tests. 9:121-122.
Ragsdale, D. W., W. Cranshaw, and J. C. Loughran. 1984. Yellow woollybear control in soybean, 1983. Insect. Acara. Tests. 9:312.
Ragsdale, D. W. and J. C. Loughran. 1985. Bean leaf beetle control in soybeans, 1984. Insect. Acara. Tests. 10:246.
Ragsdale, D. W. and D. P. Setiawan. 1985. Aster leafhopper control in carrot, 1984. Insect. Acara. Tests. 10:85-86.
Ragsdale, D. W. and D. P. Setiawan. 1985. Aster leafhopper and aster yellows control in carrot, 1984. Insect. Acara. Tests. 10:86-87.
Longtine, C. A., R. A. Suranyi, E. B. Radcliffe, D. W. Ragsdale. 1997. Control of Colorado potato beetle, A (83E). Arthropod Man. Tests 22:154.
Longtine, C. A., E. B. Radcliffe, D. W. Ragsdale. 1997. Control of Colorado potato beetle, B (84E) 1996. Arthropod Man. Tests. 22: 155
Longtine, C. A., E. B. Radcliffe, D. W. Ragsdale. 1997. Control of Colorado potato beetle, C (85E). Arthropod Man. Tests 22: 156.
Longtine, C. A., D. W. Ragsdale, E. B. Radcliffe. 1997. Control of green peach aphids on potato (86E). Arthropods Man. Tests 22: 157.
Longtine, C. A., D. W. Ragsdale, E. B. Radcliffe. 1997. Control of green peach aphids on potato B (84E) 1996. Arthropod Man. Tests. 22: 155
Longtine, C. A., D. W. Ragsdale, and E. B. Radcliffe. 1998. Control of Colorado potato beetle, 1997A. Arthropod Pest Management 23: 127.
Longtine, C. A., E. B. Radcliffe and D. W. Ragsdale. 1998. Control of Colorado potato beetle, 1997B. Arthropod Pest Management 23: 128.
Longtine, C. A., R. A. Suranyi, T. Connors, D. W. Ragsdale, E. B. Radcliffe. 1998. Control of green peach aphid on potato, 1997. Arthropod Man. Tests. Arthropod Pest Management 23: 127.
Longtine, C. A., E. B. Radcliffe and D. W. Ragsdale. 1998. Laboratory tests for Colorado potato beetle control, 1997. Arthropod Pest Management 23: 371.
Suranyi, R. A., C. A. Longtine, D. W. Ragsdale, E. B. Radcliffe. 1998. Control of potato leafhopper on potatoes using reduced rates of insecticides. Arthropod Man. Tests. 23:
Suranyi, R. A., C. A. Longtine, D. W. Ragsdale, E. B. Radcliffe. 1999. Green peach aphid control with seed treatment insecticides, 1998. Arthropod Man. Tests. 24: 168-169.
Suranyi, R. A., C. A. Longtine, D. W. Ragsdale, E. B. Radcliffe. 1999. Control of Colorado potato beetle, 1998A. Arthropod Man. Tests. 24: 169.
Longtine, C. A., R. A. Suranyi, D. W. Ragsdale, E. B. Radcliffe. 1999. Colorado potato beetle control on potatoes with foliar insecticide sprays, 1998. Arthropod Man. Tests. 24: 155.
Longtine, C. A., R. A. Suranyi, D. W. Ragsdale, E. B. Radcliffe. 1999. Control of green peach aphid, 1998. Arthropod Man. Tests. 24: 155-156.
Longtine, C. A., R. A. Suranyi, D. W. Ragsdale, E. B. Radcliffe. 1999. Control of Colorado potato beetle, 1998. Arthropod Man. Tests. 24: 156-158.
Longtine, C. A., R. A. Suranyi, D. W. Ragsdale, E. B. Radcliffe. 1999. Control of potato leafhopper, 1998. Arthropod Man. Tests. 24: 158.
Longtine, C. A., R. A. Suranyi, D. W. Ragsdale, E. B. Radcliffe. 1999. Control of potato leafhopper and green peach aphid using reduced rates of insecticides, 1998. Arthropod Man. Tests. 24: 158-160.
Munyaneza, J., E, B, Radcliffe and D. W. Ragsdale. 2000. Control of Colorado potato beetle on potatoes, 1999. Arthropod Management Tests 2000, 25: 140-141.
Munyaneza, J., E, B, Radcliffe and D. W. Ragsdale. 2000. Control of potato leafhopper on potatoes, 1999. Arthropod Management Tests 2000, 25: 141-142.
Munyaneza, J., D. W. Ragsdale and E. B, Radcliffe. 2000. Control of green peach aphid on potatoes, 1999. Arthropod Management Tests 2000, 25: 143.
Munyaneza, J., D. W. Ragsdale and E. B, Radcliffe. 2000. Control of potato insect pests using treated potato seeds, 1999. Arthropod Management Tests 2000, 25: 142-145.
Munyaneza, J., D. W. Ragsdale and E. B, Radcliffe. 2000. Control of potato leafhopper and green peach aphid using reduced rates of insecticides, 1999. Arthropod Management Tests 2000, 25: 145-146.
Munyaneza, J., D. W. Ragsdale and E. B, Radcliffe. 2000. Control of potato leafhopper adults using reduced rates of insecticides, 1999. Arthropod Management Tests 2000, 25: 145-146.
Munyaneza, J., E. B. Radcliffe, and D. W. Ragsdale. 2000. Control of green peach aphid using reduced rates of insecticides, 1999. Arthropod Management Tests 2000, 25: 147-148.
Munyaneza, J., E. B. Radcliffe, D. W. Ragsdale, and A. Nasruddin 2001. Control of Colorado potato beetle on potatoes using foliar insecticides, 2000. Arthropod Management Tests 2001, 26: E54. < http://www.entsoc.org/Protected/AMT/AMT26/E54.asp>
Munyaneza, J., E. B. Radcliffe, D. W. Ragsdale, and A. Nasruddin 2001. Control of potato leafhopper on potatoes using foliar insecticides, 2000. Arthropod Management Tests 2001, 26: E55. < http://www.entsoc.org/Protected/AMT/AMT26/E55.asp>
Munyaneza, J., E. B. Radcliffe, D. W. Ragsdale, and A. Nasruddin 2001. Control of green peach aphid on potatoes using foliar insecticides, 2000. Arthropod Management Tests 2001, 26: E56. <http://www.entsoc.org/Protected/AMT/AMT26/E56.asp>
Munyaneza, J., E. B. Radcliffe, D. W. Ragsdale, and A. Nasruddin 2001. Control of Colorado potato beetle on potatoes using using soil-applied insecticides and treated potato seeds, 2000. Arthropod Management Tests 2001, 26: E57. <http://www.entsoc.org/Protected/AMT/AMT26/E57.asp>
Munyaneza, J., E. B. Radcliffe, D. W. Ragsdale, and A. Nasruddin 2001. Control of green peach aphid on potatoes using using soil-applied insecticides and treated potato seeds, 2000. Arthropod Management Tests 2001, 26: E58. <http://www.entsoc.org/Protected/AMT/AMT26/E58.asp>
Munyaneza, J., E. B. Radcliffe, D. W. Ragsdale, and A. Nasruddin 2001. Control of wireworms on potato, 2000. Arthropod Management Tests 2001, 26: E59. <http://www.entsoc.org/Protected/AMT/AMT26/E59.asp>
Radcliffe, E.B., D.W. Ragsdale, and R.A. Suranyi. 2002. Management strategies for PLRV and PVY, two aphid-transmitted potato viruses. 21st annual National Potato Council Seed Seminar, 7-9.
Muyaneza, J. E., E. B. Radcliffe, D. W. Ragsdale. 2002. Control of Colorado potato beetle on potatoes using foliar insecticides, 2001. Arthropod Management Tests 2002, 27: E70.
Muyaneza, J. E., E. B. Radcliffe, D. W. Ragsdale. 2002. Control of potato leafhopper on potatoes using foliar insecticides, 2001. Arthropod Management Tests 2002, 27: E71.
Muyaneza, J. E., E. B. Radcliffe, D. W. Ragsdale. 2002. Control of green peach aphid on potatoes using foliar insecticides, 2001. Arthropod Management Tests 2002, 27: E72.
Muyaneza, J. E., D. W. Ragsdale, E. B. Radcliffe. 2002. Control of Colorado potato beetle on potatoes using using soil-applied insecticides and treated potato seeds, 2001. Arthropod Management Tests 2002, 27: E73.
Muyaneza, J. E., D. W. Ragsdale, E. B. Radcliffe. 2002. Control of potato leafhopper on potatoes using using soil-applied insecticides and treated potato seeds, 2001. Arthropod Management Tests 2002, 27: E74.
Davis, J. A., D. W. Ragsdale, E. B. Radcliffe. 2003. Control of aphids on potatoes using foliar insecticides, 2002. Arthropod Management Tests 2003, 28: E48.
Davis, J. A., D. W. Ragsdale, E. B. Radcliffe. 2003. Control of aphids on potatoes using soil applied insecticides and treated potato seeds, 2002. Arthropod Management Tests 2003, 28: E49.
Davis, J. A., D. W. Ragsdale, E. B. Radcliffe. 2003. Control of Colorado potato beetle on potatoes using foliar insecticides, 2002. Arthropod Management Tests 2003, 28: E50.
Davis, J. A., D. W. Ragsdale, E. B. Radcliffe. 2003. Control of Colorado potato beetle on potatoes using soil applied insecticides and treated potato seeds, 2002. Arthropod Management Tests 2003, 28: E51.
Davis, J. A., D. W. Ragsdale, E. B. Radcliffe. 2003. Control of potato leafhoppers on potatoes using foliar insecticides, 2002. Arthropod Management Tests 2003, 28: E52
Davis, J. A., D. W. Ragsdale, E. B. Radcliffe. 2003. Control of potato leafhoppers on potatoes using soil applied insecticides and treated potato seeds, 2002. Arthropod Management Tests 2003, 28: E53
Davis, J. A., D. W. Ragsdale, E. B. Radcliffe. 2004. Control of aphids on potatoes using foliar insecticides, 2003. Arthropod Management Tests 2004, 29: E60 .
Davis, J. A., D. W. Ragsdale, E. B. Radcliffe. 2004. Control of Colorado potato beetle on potatoes using foliar insecticides, 2003. Arthropod Management Tests 2004, 29: E62.
Davis, J. A., D. W. Ragsdale, E. B. Radcliffe. 2004. Control of Colorado potato beetle on potatoes using soil applied insecticides and treated potato seeds, 2003. Arthropod Management Tests 2004, 29: E63
Davis, J. A., D. W. Ragsdale, E. B. Radcliffe. 2004. Control of potato leafhoppers on potatoes using foliar insecticides, 2003. Arthropod Management Tests 2004, 29: E64
Davis, J. A., D. W. Ragsdale, E. B. Radcliffe. 2004. Colorado potato beetle row spacing experiment using soil applied insecticides and treated seed potato tubers, 2003. Arthropod Management Tests 2004, 29: E61
Davis, J. A., E. B. Radcliffe, D. W. Ragsdale. 2005. Control of aphids using foliar and soil applied insecticides, 2004. Arthropod Management Tests, 2005, 30: E58.
Davis, J. A., E. B. Radcliffe, D. W. Ragsdale. 2005. Control of Colorado potato beetle on potato using soil applied insecticides and treated potato seed potatoes, 2004. Arthropod Management Tests, 2005, 30: E59.
Davis, J. A., E. B. Radcliffe, D. W. Ragsdale. 2005. Control of Colorado potato beetle using multiple application of foliar insecticides, 2004. Arthropod Management Tests, 2005, 30: E60.
Davis, J. A., E. B. Radcliffe, D. W. Ragsdale. 2005. Control of Colorado potato beetle using a single application of foliar insecticides, 2004. Arthropod Management Tests, 2005, 30: E61.
Ragsdale, D. W., and B.P. McCornack. Control of Colorado potato beetle on potatoes using soil applied insecticides and treated seed potatoes, 2005. Arthropod Management Tests, 2006, 31: E58.
McCornack, B. P. and D. W. Ragsdale. Efficacy of registered and experimental rates of thiamethoxam for soybean aphid control, 2005. Arthropod Management Tests, 2006, 31: F42.
Koch, K.A. and D. W. Ragsdale. Soybean aphid control with thiamethoxam seed treatment, 2008. Arthropod Management Tests, 2008, 34: FXX.
Papers or Posters Presented at Scientific Meetings (159 presentation)
1978 National Meeting, Entomological Society of America: "Microorganisms associated with the feeding process of the southern green stink bug, Nezara viridula (L.)." (Ragsdale, Larson & Newsom)
1980 National Meeting, Entomological Society of America: "Quantitative assessment of predation of Nezara viridula (L.)" (Ragsdale, Newsom & Larson)
1981 National Meeting, Entomological Society of America: "Development of an enzyme-linked immunosorbent assay for determining the predators of Nezara viridula eggs and nymphs" (Ragsdale, Newsom & Larson)
1982 North Central Branch, Entomological Society of America: "Use of an ELISA for detection of bean pod mottle virus within its vector, the bean leaf beetle." (Ragsdale)
1984 North Central Branch, Entomological Society of America: "Bean pod mottle virus - a yield loss analysis. (Ragsdale)
1984 North Central Branch, Entomological Society of America: "Bean leaf beetle life cycle in southern Minnesota." (Loughran & Ragsdale)
1984 World Soybean Conference - III Ames, Iowa. "Bean pod mottle virus and soybean yield: Effects of inoculation data and infection rate." (Ragsdale)
1986 North Central Branch, Entomological Society of America: "Serological detection of Acarapis woodi a honeybee parasite." (Ragsdale)
1986 North Central Branch, Entomological Society of America: "Use of Reflective mulches in carrot to control aster leafhopper and aster yellows." (Setiawan & Ragsdale)
1986 North Central Branch, Entomological Society of America: "Overwintering survival of bean leaf beetles in southern Minnesota." (Loughran & Ragsdale)
1986 North Central Branch, Entomological Society of America: "Spread of Potato leafroll virus in Minnesota potato seed production." (Hanafi, Ragsdale & Radcliffe)
1987 Annual Meeting, Potato Association of America: "Effect of storage conditions and time on serological evaluation of potato foliage for potato leafroll virus." (Ragsdale)
1987 Annual Meeting, Potato Association of America: "Secondary spread of potato leafroll virus in relation to aphid numbers." (Radcliffe, Ragsdale & Hanafi)
1987Annual Meeting, Entomological Society of America: "Monoclonal antibody based assay for detection of honey bee tracheal mite." (Kjer & Ragsdale)
1988 North Central Branch, Entomological Society of America: "Effect of aphid density on secondary spread of potato leafroll virus" (Ragsdale, Radcliffe, & Hanafi)
1988 North Central Branch, Entomological Society of America: Transmission of potato leafroll virus by green peach aphid, Myzus persicae: correlation between foliar and tuber infection. (Flanders, Ragsdale, & Radcliffe)
1989 North Central Branch, Entomological Society of America: "Use of Neem to control grasshoppers/locusts on millet and sorghum in Niger, Africa. (Radcliffe, Ragsdale, Sani, Noetzel, & Strzok)
1989 Integrated Pest Management Symposium, Las Vegas "Action thresholds for an aphid vector of potato leafroll virus" (Flanders, Radcliffe, Ragsdale, & Hanafi)
1989 Pacific Chemical Society: "Use of Neem to Control Grasshoppers/Locusts on Millet and Sorghum in Niger, Africa" (Strzok, Radcliffe, Ragsdale, Sani, Khoury, Noetzel)
1990 Aphid-plant interactions: populations to molecules an international symposium, Stillwater, Oklahoma: "Spread of potato leafroll virus in relation to densities of green peach aphid: implications for management thresholds for Minnesota seed potatoes" (Flanders, Ragsdale & Radcliffe)
1990 North Central Branch, Entomological Society of America: "Green peach aphid (Homoptera: Aphididae) action thresholds for management of potato leafroll virus in potato" (Flanders, Radcliffe and Ragsdale)
1990 North Central Branch, Entomological Society of America: "Differential spread of potato leafroll virus in two potato cultivars" (DiFonzo, Ragsdale, Radcliffe)
1991 International Conference on Potato Pest Management: "Breeding for green peach aphid resistance" (Longtine, Radcliffe, Ragsdale, Lauer)
1991 International Conference on Potato Pest Management: "Inoculation load and mature plant resistance effects on potato leafroll virus infection in tubers" (DiFonzo, Ragsdale, Radcliffe, & Banttari)
1991 International Conference on Potato Pest Management: "Insecticidal control of green peach aphid and spread of PVY" (Connelly, Vaadeland, Ragsdale, & Radcliffe)
1991 Annual Meeting, Entomological Society of America: "Action threshold for Myzus persicae, a vector of potato leafroll virus in differentially resistant cultivars" (DiFonzo, Ragsdale, Radcliffe & Banttari)
1991 Annual Meeting, Entomological Society of America: "A species-specific enzyme-linked immunosorbent assay (ELISA) for Nosema furnacalis (Microspora: Nosematidae). (Oien & Ragsdale)
1992 Agricultural Research Service Cooperators Meeting: Colorado Potato Beetle and Aphids Research (October 8, 1992): "Action thresholds for aphid vectors of PLRV" (Ragsdale, Radcliffe, DiFonzo, Connelly)
1992 Agricultural Research Service Cooperators Meeting: Colorado Potato Beetle and Aphids Research (October 8, 1992): "Incorporation of resistance to green peach aphid, potato leafroll virus and potato virus Y" (Longtine, Radcliffe, Lauer, & Ragsdale)
1993 North Central Branch, Entomological Society of America: "Management of potato virus Y in Minnesota and North Dakota: Epidemiology and cultural control" (DiFonzo, Ragsdale, Radcliffe, Banttari, Gudmestad, Secor)
1993 North Central Branch, Entomological Society of America: "Incorporation of resistance to green peach aphid, potato leafroll virus, and potato virus Y" (Longtine, Radcliffe, & Ragsdale)
1993 North Central Branch, Entomological Society of America: "Susceptibility of nontarget hosts to Nosema furnacalis {Microsporida: Nosematidae}, a potential biological control agent of the European corn borer, Ostrinia furnacalis {Lepidoptera: Pyralidae} (Oien & Ragsdale)
1993 Potato Association of America: "Incorporation of resistance to green peach aphid, potato leafroll virus and potato virus Y from exotic Solanum sources" (Longtine, Radcliffe, Ragsdale, and Lauer)
1993 Potato Association of America: "Regional importance of the major insect pests of potato in the U.S. and Canada" (Radcliffe, Flanders, Ragsdale & Noetzel)
1994 Potato Association of America: "Use of crop borders to reduce potato virus Y incidence in Red River Valley Seed Potato" (Ragsdale, DiFonzo, Radcliffe, Gudmestad, Secor)
1994 USDA/National Potato Council Cooperators Meeting: "Crop Borders: A novel management strategy for early generation seed potato" (Ragsdale, Radcliffe, DiFonzo)
1994 Potato Association of America: "Epidemiology of potato virus Y in the Red River Valley of Minnesota and North Dakota" Poster: (DiFonzo, Ragsdale, Radcliffe, Gudmestad, Secor).
1994 Potato Association of America: "Use of Exotic Solanum species for control of green peach aphid, potato leafroll virus and potato virus Y" Poster: (Longtine, Radcliffe, Lauer, Ragsdale)
1994 Entomological Society of America: "Use of crop borders to reduce potato virus Y incidence in Red River Valley seed potato” Poster: (DiFonzo, Ragsdale, Radcliffe, Gudmestad, Secor, Holen, Preston.)
1994 Second International Symposium - The Ecology of Agricultural Pests: Biochemical Approaches. "An Environmental Risk Assessment for Release of an Exotic Microsporidium for European Corn Borer Control" (Ragsdale & Oien)
1995 Sixth International Symposium on Plant Virus Epidemiology: "Control of PVY spread in seed potato production in Minnesota and North Dakota". (Ragsdale, DiFonzo, Radcliffe, Gudmestad, Secor).
1995 Potato Association of America: “Aphid Species Associated with Potato Virus Y Spread in the Red River Valley, 1992-1994 Field Seasons” (Ragsdale, DiFonzo, Radcliffe, Gudmestad, Secor).
1995 Ragsdale, D. W. User action thresholds for potato leafroll virus (PLRV). Formal Conference on Vegetable Entomology, 1995 ESA Annual Meeting, December, 1995.
1996 Ragsdale, D. W. The impact of plant biotechnology on potato pest management and the potato industry - The ecological impacts of insect and virus resistance in potatoes. Potato Association of America, August, 1996.
1998 Suranyi, R., E. B. Radcliffe, and . W. Ragsdale. Aphid thresholds for potato leaf roll virus control (AURI-PRO 205), ESA Annual Meeting, November 1998.
1998 Ruano-Rossil, J. D. W. Ragdale, and E. B. Radcliffe. Interference of Potato Late Blight Fungicides with Fungal Entomopathogens of Green Peach Aphid. ESA Annual Meeting, November 1998.
1998 Ragsdale D. W., E. B. Radcliffe, and C. M Donaldson. Effects of Late Blight Fungicides on Entomopathogenic Fungi of the Green Peach Aphid, ESA Annual Meeting, November 1998.
1998 Ruano-Rossil, J. [presenter], D. W. Ragsdale, and E. B. Radcliffe. Interference of potato late blight fungicides with fungal entomopathogens of green peach aphid. North Central Branch of Entomological Society of America, poster, Sioux Falls, SD, March 1998.
1998 Ragsdale, D. W., C. Donaldson, and E. B. Radcliffe. Sensitivity of entomopathogenic fungi to fungicides, paper, Potato Association of America, Fargo, ND July 1998.
1998 Novy, R., E. B. Radcliffe, D. W. Ragsdale, and C. A. Longtine. Aphid and virus resistance in potato clones derived from Solanum etubersum, paper, Potato Association of America, , Fargo, ND July 1998.
1998 Longtine C. A., J. Backlund, C. A. Thill, D. W. Ragsdale, and E. B. Radcliffe. Breeding potatoes resistant to potato leafhopper, poster. Potato Association of America, poster, Fargo, ND July 1998.
1998 Ruano-Rossil, J, D. W. Ragsdale and E. B. Radcliffe. Interference of potato late blight fungicides with fungal entomopathogens of green peach aphid. Potato Association of America, poster, Fargo, ND July 1998.
1998 DiFonzo, C. D., D. W. Ragsdale, and E. B. Radcliffe Management of vectors and virus in seed potatoes, paper in Formal Conference: Vegetable Entomology: Management of Diverse Vector-Disease Associations in Vegetable Crops. Entomological Society of America, Las Vegas, November 1998.
1998 Ragsdale, D. W. and E. B. Radcliffe, A North American Aphid Trapping Network: Utility? Feasibility, Reality? Presentation on Minnesota Rapid Response Project and Aphid Alert newsletter. Entomological Society of America, Las Vegas, November 1998.
1998 Ragsdale, D. W, C. Donaldson, and E. B. Radcliffe. Effects of late blight fungicides on entomopathogenic fungi of the green peach aphid, paper, Entomological Society of America, Las Vegas, November 1998.
1998 Suranyi, R. A., E. B. Radcliffe, and D. W. Ragsdale. Aphid thresholds for potato leafroll virus control (AURI-PRO 205), poster, graduate student competition Entomological Society of America, Las Vegas, November 1998.
1998 Ruano-Rossil, J., E. B. Radcliffe, and D. W. Ragsdale. Interference of potato late blight fungicides with fungal entomopathogens of green peach aphid, poster, graduate student competition in Section Cd. Entomological Society of America, Las Vegas, November 1998. NOTE: First place award in Section Cd.
1999 Suranyi, R. A., E. B. Radcliffe, and D. W. Ragsdale. Seasonal abundance of aphid vectors of potato viruses in the Red River Valley. Entomological Society of America – North Central Branch, Des Moines, March 1999. NOTE: First Place Award, Ph.D. presentation.
1999 Katovich E. J. S., A. J. Milles, D. W. Ragsdale and R. L. Becker. 1999. Feeding and oviposition preference of Galerucella spp. in Lythrum., International Symposium on Weed Biocontrol, Bozeman, Montana, July 1999.
1999 Newman, R.M., D.W. Ragsdale A. Milles, and J. Foley. Factors influencing the success of the native milfoil weevil to control Eurasian watermilfoil in Minnesota, International Symposium on Weed Biocontrol, Bozeman, Montana, July 1999.
2000 Novy, R., Ragsdale, D. W., Radcliffe, E. B., and Nasruddin, A. Introgression of Virus and Aphid Resistance From Solanum etuberosum to Cultivated Potato. Potato Association of America Annual Meeting, New Jersey, July 1999.
2000 Newman, R. M., D. D. Biesboer, D. W. Ragsdale, and A. Milles. Use of a native weevil to control the exotic aquatic Eurasian watermilfoil. North Central Branch ESA Annual Meeting, Minneapolis, March 2000
2000 Suranyi, R. A., E. B. Radcliffe, D. W. Ragsdale, and I. V. MacRae. Aphid Alert: Multimedia Delivery of Near Real Time Information on the Population Dynamics of Aphid Vectors of Potato Viruses in the Red River Valley of Minnesota and North Dakota., North Central Branch, ESA, Minneapolis, March 2000
2000 Suranyi, R. A., E. B. Radcliffe, D. W. Ragsdale, I. V. MacRae, B. E. Lockhart & D. McLaren. Aphid Alert: Research/Outreach addressing potato virus problems in the northern central U.S. and Canada. International Congress of Entomology, Igazu Falls, Brazil, August 2000.
2000 Newman, R.M., D.W. Ragsdale, A. Milles, and C. Oien. 2000. Overwinter habitat and the relationship of overwinter to in-lake densities of the milfoil weevil, Euhrychiopsis lecontei, a Eurasian watermilfoil biological control agent. Aquatic Plant Management Society, Annual Meeting, San Diego, July 2000.
2000 Legg, D., S. Van Vleet, D. Ragsdale, R. Hansen, J. Lloyd. 2000. Phenology models for first emergence of adult Apthona nigriscutis Foudras. Entomological Society of America, National Meeting, Montreal, December 2000.
2000 Ragsdale, D. W., R. Suranyi, E. B. Racliffe, M. Carroll, and I. V. MacRae. 2000. Regional monitoring system for aphid vectors of potato viruses in Minnesota and North Dakota. Entomological Society of America, National Meeting, Poster Display Section F: Crop Protection Entomology, Montreal, December 2000.
2000 M. Carroll, I. V. MacRae, Ragsdale, D. W., E. B. Racliffe. 2000. Site specific management of green peach aphids in seed potato – window of opportunity for targeted application. Entomological Society of America, National Meeting, Student Competition Section F: Crop Protection Entomology, Montreal, December 2000.
2000 Suranyi, R., I. V. MacRae, Ragsdale, D. W., E. B. Racliffe. 2000. Site specific management of green peach aphids in seed potato – locations for targeted application. Entomological Society of America, National Meeting, Student Competition Section F: Crop Protection Entomology, Montreal, December 2000.
2000 Zhu, M., I. V. MacRae, Ragsdale, D. W., E. B. Racliffe M. Carroll, and R. Suranyi. 2000. Local dispersal of aphid vectors of potato viruses in Minnesota and North Dakota. Entomological Society of America, National Meeting, Poster Display Section F: Crop Protection Entomology, Montreal, December 2000.
2001 R. C. Venette, D. Ragsdale, K. Ostlie, W. Hutchison and I. MacRae. 2001. Invasion of the soybean aphid: perspectives from risk assessment. Entomological Society of America, North Central Branch, Fort Collins, March 2001
2001 Robert A. Suranyi, Matthew W. Carroll, David W. Ragsdale, Edward B. Radcliffe and Ian V. MacRae. 2001. The role of canola in the summer migration of green peach aphid, Myzus persicae (Sulzer) (Hemiptera: Aphididae) in the Red River Valley of the North. Entomological Society of America, North Central Branch, Fort Collins, March 2001
2001 David W. Ragsdale, Jorge Ruano-Rossil and Edward B. Radcliffe. 2001. Conservation of natural enemies of green peach aphid in potato production. Entomological Society of America, North Central Branch, Fort Collins, March 2001
2001 Matthew W. Carroll, Ian Macrae, Robert Suranyi, Ted Radcliffe and Dave Ragsdale. 2001. Temporal and Spatial Aspects of Site Specific Management for the Green Peach Aphid, Myzus persicae (Sulzer), in potatoes. Entomological Society of America, North Central Branch, Fort Collins, March 2001
2002 Zhu, M., E.B. Radcliffe, D.W. Ragsdale and I.V. MacRae. 2002. The possible source areas and over-wintering hosts of green peach aphid, Myzus persicae, in the Red River Valley, pp. 249-251, In: 15th Conference on Biometerology and Aerobiology. American Meterological Society, Boston, MA
2002 Matthew W. Carroll, I.V. MacRae, R.A. Suranyi, D.W. Ragsdale, E.B. Radcliffe. 2002. Site-specific management of green peach aphids in seed potato – windows of opportunity for targeted application. Joint meeting of the Entomological Society of Manitoba and the Entomological Society of Canada, Winnipeg, Manitoba, 5-9 October.
2002 Ian V. MacRae, D. Ragsdale, R. Venette. 2002. Remote sensing of buckthorn and early season scouting of soybean aphid. Joint meeting of the Entomological Society of Manitoba and the Entomological Society of Canada, Winnipeg, Manitoba, 5-9 October.
2002 Robert A. Suranyi, I.V. MacRae, M.W. Carroll, D.W. Ragsdale, E.B. Radcliffe. 2002. Green peach aphid, Myzus persicae (Sulzer) (Hemiptera: Aphididae) development on harvested canola. Joint meeting of the Entomological Society of Manitoba and the Entomological Society of Canada, Winnipeg, Manitoba, 5-9 October.
2002 Edward B. Radcliffe, D.W. Ragsdale, R.A. Suranyi, I.V. MacRae . 2002. Aphid Alert. Joint meeting of the Entomological Society of Manitoba and the Entomological Society of Canada, Winnipeg, Manitoba, 5-9 October.
2002 D. W. Ragsdale and D. B. Hogg (moderators). Introduction. Update on Soybean Aphid Research and Management. Annual Meeting, Entomological Society of America, Ft. Lauderdale, 17-21 November 2002.
2002 D. W. Ragsdale. Soybean aphid: Its impact on soybean production and soybean pest management in North America. Annual Meeting, Entomological Society of America, Ft. Lauderdale, 17-21 November 2002.
2002 Robert A. Suranyi, Edward B. Radcliffe, David Ragsdale, and Ian V. MacRae. Aphid Alert: region-wide surveillance of virus vector aphid species of potato in the Northern Great Plains. Annual Meeting, Entomological Society of America, Ft. Lauderdale, 17-21 November 2002.
2002 Program Symposium: “Using Risk Assessment To Integrate Systematics, Ecology And Management Of Invasive Species”. Moderators and Organizers: Susan J. Weller, Robert C. Venette, and David W. Ragsdale. Annual Meeting, Entomological Society of America, Ft. Lauderdale, 17-21 November 2002.
2002 Brian P. McCornack, Luke C. Skinner, David Ragsdale. Landscape-scale and within wetland movement of Galerucella spp. introduced for management of purple loosestrife (Lythrum salicaria L.), Poster Presentation, Annual Meeting, Entomological Society of America, Ft. Lauderdale, 17-21 November 2002.
2002 Min Zhu, Edward B. Radcliffe, David Ragsdale, Ian V. MacRae. Possible origins and pathways of green peach aphid, Myzus persicae (Sulzer), migration to the Red River Valley of Minnesota and North Dakota, Annual Meeting, Entomological Society of America, Ft. Lauderdale, 17-21 November 2002.
2002 Matthew W. Carroll, Ian V. MacRae, Robert A. Suranyi, Edward B. Radcliffe, David Ragsdale. Landscape based threat index for the aphid vectored viruses potato leafroll virus and potato virus Y. Annual Meeting, Entomological Society of America, Ft. Lauderdale, 17-21 November 2002.
2002 Erin Hodgson, Ian MacRae, Ken Ostlie, Robert C. Venette, David Ragsdale. Comparing spatial and temporal colonization of soybean aphid. Annual Meeting, Entomological Society of America, Ft. Lauderdale, 17-21 November 2002.
2002 Luke C. Skinner, David Ragsdale, Monika Chandler. Development of phenological models for Aphthona spp. introduced to control leafy spurge. Annual Meeting, Entomological Society of America, Ft. Lauderdale, 17-21 November 2002.
2002 Robert J. O'Neil, George Heimpel, David Voegtlin, David Ragsdale, Zhishan Wu, Keith R. Hopper, David R. Prokrym, and Ken-ichiro Honda. Possibilities for classical biological control of the soybean aphid. Annual Meeting, Entomological Society of America, Ft. Lauderdale, 17-21 November 2002.
2002 George Heimpel, David Ragsdale, David Hogg, Zhishan Wu, and Bob Ellingson. Parasitoid releases against soybean aphid: pros, cons & data. Annual Meeting, Entomological Society of America, Ft. Lauderdale, 17-21 November 2002.
2002 Ian V. MacRae, David Ragsdale, Robert C. Venette, and Bruce Potter. Remote sensing of buckthorn and early season scouting of soybean aphid. Annual Meeting, Entomological Society of America, Ft. Lauderdale, 17-21 November 2002.
2003 Carroll, Matthew W., Min . Zhu, Edward B. Radcliffe, Ian V. MacRae, David W. Ragsdale and Robert A. Suranyi. Migration, local dispersal and colonization behavior of green peach aphid, Myzus persicae, North Central Branch, Entomological Society of America, Madison, WI, March 2003.
2003 Hodgson, Erin W., Robert C. Venette and David W. Ragsdale. Summer alatae production of soybean aphid in Minnesota, North Central Branch, Entomological Society of America, Madison, WI, March 2003.
2003 Davis, Jeffrey A., David W. Ragsdale and Edward B. Radcliffe. Soybean aphid (Aphis glycines Matsumura) is a vector of PVY. North Central Branch, Entomological Society of America, Madison, WI, March 2003.
2003 Radcliffe, Edward B., Robert A. Suranyi and David W. Ragsdale. Predicting the risk of current season spread of the aphid-transmitted viruses, Potato leafroll virus and Potato virus Y, in seed potatoes, North Central Branch, Entomological Society of America, Madison, WI, March 2003.
2003 Carroll, Matthew W., Ian V. MacRae, Robert A. Suranyi, Edward B. Radcliffe and David Ragsdale. Landscape based threat index for the aphid vectored virus potato virus Y. North Central Branch, Entomological Society of America, Madison, WI, March 2003
2003 Novy, Richard G., J. M. Alvarez, D. L. Corsini, A. Nasruddin, E. B. Radcliffe and D.W. Ragsdale. Resistance to PVY, PLRV, PVX, green peach aphid, Colorado potato beetle, and wireworm in the progeny of a tri-species somatic hybrid. Potato Association of America, Spokane, WA, 10-14 August 2003.
2003 Skinner, Luke, David W. Ragsdale, Roger Becker, and Monika Chandler. Establishment and control success of Aphthona lacertosa and A. nigriscutis (Coleoptera: Chrysomelidae) introduced to control leafy spurge, Euphorbia esula L., in Minnesota. Annual Meeting, Entomological Society of America, Cincinnati, 26-30 October 2003.
2003 Hodgson, Erin W., Robert C. Venette, and David W. Ragsdale. Spring colonization and summer migration of soybean aphid. Annual Meeting, Entomological Society of America, Cincinnati, 26-30 October 2003. (First Place Award Winner in Student Competition, Section F)
2003 McCornack, Brian P., David W. Ragsdale, and Robert C. Venette. Temperature and moisture effects on fecundity and survivorship of the soybean aphid (Homoptera: Aphididae). Annual Meeting, Entomological Society of America, Cincinnati, 26-30 October 2003. (poster presentation)
2003 Carroll, Matthew, Ian V. MacRae, David W. Ragsdale, and Edward B. Radcliffe. Influence of the surrounding landscape on incidence of the aphid-transmitted viruses potato virus Y and potato leafroll virus in seed potato on incidence of the aphid-transmitted viruses potato virus Y and potato leafroll virus in seed potato. (Second Place in Student Competition, Section F). Annual Meeting, Entomological Society of America, Cincinnati, 26-30 October 2003.
2003 Davis, J. A., E. B. Radcliffe and D. W. Ragsdale. 2003. A new vector of PVY: Soybean aphid, Aphis glycines (Matsumura). Potato Association of America, Spokane, WA, 10-14 August 2003.
2004 Carroll, M.W., E.B. Radcliffe, I.V. MacRae, K.D Olson and D.W. Ragsdale. 2004. Site-specific Management of Green Peach Aphid, Myzus persicae (Sulzer), in Seed Potato. International Conference on Precision Agriculture, St. Paul, July 2004
2004 E.B. Radcliffe, M.W. Carroll, I.V. MacRae, D.W. Ragsdale, K.D. Olson, and R.A.Suranyi Targeted control of Myzus persicae (Sulzer) in N. American seed potato production., XXII International Congress of Entomology, Brisbane, Australia, August 2004.
2004 Hladilek, E.E., R.A. Suranyi, E.B. Radcliffe, D.W. Ragsdale and I.V. MacRae. 2004. Flight activity of aphid vectors of Potato virus Y in Minnesota and North Dakota seed potato fields. North Central Branch, ESA, Kanas City, Missouri, March 2004.
2004 Wu, Z., G.E. Heimpel, D.W. Ragsdale, K.R. Hopper, and D. Voegtlin. 2004. Classical Biological Control of Soybean Aphid. North Central Branch, ESA, Kanas City, Missouri, March 2004.
2004 Davis, J.A., E.B. Radcliffe, D.W. Ragsdale and C.A. Thill. 2004. Identifying resistance to aphids and aphid-transmitted viruses in potato. North Central Branch, ESA, Kanas City, Missouri, March 2004.
2004 Carroll, M.W., I.V. MacRae, E.B. Radcliffe and D.W. Ragsdale. 2004. Influence of the surrounding landscape on incidence of the aphid-transmitted viruses potato virus Y and potato leafroll virus in seed potato. North Central Branch, ESA, Kanas City, Missouri, March 2004.
2004 Hodgson, E.W., E.C. Burkness, D.W. Ragsdale and W.D. Hutchison. 2004. Development of enumerative and binomial sampling plans for soybean aphid. North Central Branch, ESA, Kanas City, Missouri, March 2004.
2004 DiFonzo, C. D., W. Bailey, T. Baute, L., Bledsoe, E. Cullen, P. Glogoza, M. Gray, B. Eisley, R. Hammond, T. Hunt, D. Johnson, K. Ostlie, D. Ragsdale, M. Rice, and D. Voegtlin. 2004. A consensus recommendation for soybean aphid control - 2004 field season. North Central Branch, ESA, Kanas City, Missouri, March 2004.
2004 Carroll, M. W., I. V. MacRae, E. B. Radcliffe, and D. W. Ragsdale. 2004. Reduction of methamidophos applied for Myzus persicae control in seed potato by targeted sprays. Entomological Society of America, annual meeting, Salt Lake City, Utah, Nov. 2004.
2004 Davis, J. A., E. B. Radcliffe, and D. W. Ragsdale. 2004. Probing behavior of aphid species differing in PVY transmission efficiency. Entomological Society of America, annual meeting, Salt Lake City, Utah, Nov. 2004.
2004 Hodgson, E. W., E. C. Burkness, W. D. Hutchison, and D. W. Ragsdale. Speed scouting for soybean aphid. 2004. Entomological Society of America, annual meeting, Salt Lake City, Utah, Nov. 2004.
2004 Skinner, L., D. W. Ragsdale, and M. Chandler. Effect of competition and release size on establishment of Aphthona lacertosa and A. nigirscutis, two flea beetles introduced to control leafy spurge, Euphorbia esula. 2004. Entomological Society of America, annual meeting, Salt Lake City, Utah, Nov. 2004.
2004 Ragsdale, D. W. and B. P. McCornack. 2004. Efficacy of thiamethoxam to suppress soybean aphid (Homoptera: Aphididae) populations. Entomological Society of America, annual meeting, Salt Lake City, Utah, Nov. 2004.
2004 Wu, Z., G. E. Heimpel, K. R. Hopper, D. W. Ragsdale, and D. J. Voegtlin. 2004. Host specificity of soybean aphid parasitoids. Entomological Society of America, annual meeting, Salt Lake City, Utah, Nov. 2004.
2004 McCornack, B. P., D. W. Ragsdale, and R. Venette. 2004. Demography of soybean aphid (Homoptera: Aphididae) at fluctuating temperatures. Entomological Society of America, annual meeting, Salt Lake City, Utah, Nov. 2004.
2004 M. Zhu, E.B. Radcliffe, D.W. Ragsdale, and I.V. McRae. Weather patterns Influence seasonal abundance of green peach aphid (Myzus persicae (Sulzer)) and spread of Potato leafroll virus in the Red River Valley Aerobiology.
2005 R. L. Becker, E.J.S Katovich, D.W. Ragsdale, University of Minnesota and C. Skinner - Minnesota Department of Natural Resources. Success of Biological Control of Purple Loosestrife With Insects (Galerucella species) in Minnesota, Weed Science Society of America, February 2005.
2005 E. J. S. Katovich, R. L. Becker, D. W. Ragsdale and L. C. Skinner. 2005. Host range testing of garlic mustard (Alliaria petiolata) biocontrol insects in Minnesota. Biology, Ecology and Management of Garlic Mustard and European Buckthorn. 17-18 March 2005, University of Minnesota, St. Paul, MN.
2005 M. VanVeldhuizen-Yoder, D. W. Ragsdale, and L. C. Skinner. 2005. Survey of insect fauna on common buckthorn, Rhamnus cathartica, in Minnesota. Biology, Ecology and Management of Garlic Mustard and European Buckthorn. 17-18 March 2005, University of Minnesota, St. Paul, MN.
2005 Skinner, L. C. and D. W. Ragsdale. Future needs in developing biological control for buckthorn. Biology, Ecology and Management of Garlic Mustard and European Buckthorn. 17-18 March 2005, University of Minnesota, St. Paul, MN.
2005 R. J. O’Neil, D. Voegtlin, K. L. Steffey, M. O’Neal, G. Heimpel, D. Ragsdale, K. Hopper, K. Hoelmer, D. Mahr, C. Gratton, E. Cullten, D. Landis, and C. DiFonzo. 2005. Importation biological control of the soybean aphid in the USA. 2 – 7 October 2005, 7th International Symposium on Aphis, Fremantle, Western Australia, Australia.
2005 E. W. Hodgson, E. C. Burkness, W. D. Hutchison, and D. W. Ragsdale. 2005. Speed scouting – a sequential sampling plan for soybean aphid in North America. 2 – 7 October 2005, 7th International Symposium on Aphis, Fremantle, Western Australia, Australia.
2005 David W. Ragsdale, Brian P. McCornack, Robert L. Koch. 2005. In-field sex determination of Harmonia axyrdis (Coleoptera: Coccinellidae) using readily accessible morphological characters. Entomological Society of America, Annual Meeting, 15-18 December 2005, Fort Lauderdale, FL
2005 Jeffrey A. Davis, Edward B. Radcliffe, David W. Ragsdale, Christian A. Thill. Identifying and mapping mechanisms of host plant resistance to aphids in potato. Entomological Society of America, Annual Meeting, 15-18 December 2005, Fort Lauderdale, FL
2005 Michele Yoder, David W. Ragsdale, Luke Skinner. Assessing the establishment of two Galerucella spp. (Coleoptera: Chrysomelidae) introduced to control purple loosestrife, Lythrum salicaria, in Minnesota. Entomological Society of America, Annual Meeting, 15-18 December 2005, Fort Lauderdale, FL
2005 Robert L. Koch, George E. Heimpel, Paul M. Porter, Matthew M. Harbur, David W. Ragsdale. Evaluation of fall-seeded rye cover crops for insect pest management in organic soybeans. Entomological Society of America, Annual Meeting, 15-18 December 2005, Fort Lauderdale, FL
2005 Hodgson, E. W., D. W. Ragsdale, B. P. McCornack, K. A. Koch, C. D. DiFonzo, M. Jewett, E. Cullen, H. Kraiss, M. O’Neal, and K. Johnson. 2005. Field validation of speed scouting for soybean aphid. Entomological Society of America, Annual Meeting, 15-18 December 2005, Fort Lauderdale, FL.
2005 Matthew W. Carroll, Ian V. MacRae, Edward B. Radcliffe and David W. Ragsdale The influence of landscape composition on the incidence of the aphid-transmitted viruses Potato leafroll virus and Potato virus Y. ESA-NCB Meeting, March 20-23, 2005, West Lafayette, Indiana
2005 Jeffrey A. Davis, Edward B. Radcliffe and David W. Ragsdale. Fluctuating temperature effects on the green peach aphid, Myzus persicae (Sulzer). ESA-NCB Meeting, March 20-23, 2005, West Lafayette, Indiana
2005 Mario A. Carrillo, Robert L. Koch, Eric C. Burkness, Kathleen Bennett, William D. Hutchison and David W. Ragsdale Overwintering survival of bean leaf beetle, Cerotoma trifurcata (Foster), in southern Minnesota. ESA-NCB Meeting, March 20-23, 2005, West Lafayette, Indiana
2005 K. Koch, D. Ragsdale, B. Potter, and J. Kurle. Suppression of Entomopathogens of Soybean Aphid by Foliar Fungicides. National Soybean Rust Symposium, 15-16 November 2005, Nashville, TN. http://www.plantmanagementnetwork.org/infocenter/topic/soybeanrust/symposium/posters/44.asp
2005 Jeffrey A. Davis, Edward B. Radcliffe and David W. Ragsdale. Crop Borders Revisited. Potato Association of America Annual Meeting, 17 – 21 July 2005, Calgary, Alberta, Canada
2005 Jeffrey A. Davis, Edward B. Radcliffe, David W. Ragsdale and Christian A. Thill. Identifying resistance to aphids in crosses with somatic fusions of Solanum tuberosum L. and Solanum bulbocastenum. Potato Association of America Annual Meeting, 17 – 21 July 2005, Calgary, Alberta, Canada
2005 Edward B. Radcliffe, Matthew W. Carroll, Ian V. MacRae, David W. Ragsdale and Kent D. Olson. Border application to reduce insecticide use in seed potato production: a biological, economic, and managerial analysis. Potato Association of America Annual Meeting, 17 – 21 July 2005, Calgary, Alberta, Canada
2005 David W. Ragsdale, Min Zhu, Edward B. Radcliffe, and Ian V. MacRae. Immigration of green peach aphid, Myzus persicae (Sulzer) and spread of Potato leafroll virus in the Red River Valley. Potato Association of America Annual Meeting, 17 – 21 July 2005, Calgary, Alberta, Canada
2006 Edward B. Radcliffe, I. V. Macrae, D. W. Ragsdale, M. Zhu, and M. W. Carroll. And they lived happily ever after – Marrying meteorological models and site specific management to control green peach aphid, Myzus persicae (Sulzer), in seed potatoes. 54th Entomol. Soc. Am., Indianapolis, IN, 12 Dec 2006.
2006 Jeffrey A. Davis, Edward B. Radcliffe, David W. Ragsdale and Christian A. Thill. Identifying and mapping resistance to green peach aphid, Myzus persicae (Sulzer), in potato. Potato Association of America, Annual Meeting 23-27 July 2006, Madison, WI
2006 David W. Ragsdale, Erin W. Hodson, Brian P. McCornack, Robert C. Venette and Lisa M. Behnken, Matthew O'Neal, Kevin Johnson, Eileen Cullen, Heidi Kraiss, Christia D. DiFonzo, Karrie Koch, Tom Hunt, Bruce Potter, Phil Glogoza, Robert O'Neil. Soybean Aphid: A Regional Approach to Management of an Invasive Insect. North Central Branch, Entomological Society of America. 25-29 March 2006, Bloomington, IN, pp. 103-110. http://www.ipm.uiuc.edu/conferences/cptc/proceedings.pdf
2006 David W. Ragsdale, Erin W. Hodson, Brian P. McCornack, Karrie A. Koch, Robert C. Venette and Bruce Potter. Soybean Aphid and the Challenge of Integrating Recommendations within an Integrated Pest Management System. National IPM Symposium. 4-6 April 2006, St. Louis, MO.
2006 Jeffrey A. Davis, Edward B. Radcliffe and David W. Ragsdale. The Role of PVYN:O in Sustaining the Current Potato Yirus Y Epidemic in Minnesota Seed Potatoes. North Central Branch, Entomological Society of America. 25-29 March 2006, Bloomington, IN
2006 David J. Voegtlin, Eileen Cullen, Entomology Department, Chris DiFonzo, Matthew E. O,Neal, Robert J. O'Neil, David W. Ragsdale. Making Itself at Home: The Soybean Aphid Settles In. North Central Branch, Entomological Society of America. 25-29 March 2006, Bloomington, IN
2006 Karrie A. Koch and David W. Ragsdale. The Effect of Foliar Fungicides on Fungal Entomopathogens of Soybean Aphid in Minnesota. The Soybean Aphid Settles In. North Central Branch, Entomological Society of America. 25-29 March 2006, Bloomington, IN http://esa.ent.iastate.edu/confreg/?gridaction=viewonepresentation&year=2006&presnum=068
2006 Jeffrey A. Davis, Edward B. Radcliffe and David W. Ragsdale. Impaired Stand Favors PVY Spread in Potato North Central Branch, Entomological Society of America. 25-29 March 2006, Bloomington, IN
2006 Olson, Kent D., Thaddee Badibanga, Edward B. Radcliffe, and David W. Ragsdale. 2006. The Value of Crop Borders for Management of Potato Virus Y (PVY) in Seed Potatoes. International Association of Agricultural Economists, Brisbane, Australia, August 12-18, 2006
2006 Katovich, Elizabeth Jean, Roger Becker, Esther Gerber, Hariet Hinz, David Ragsdale, Luke Skinner. 2006. The Garlic Mustard Biocontrol Story: Past, Present, and Future. Northcentral Weed Control Conference, Invasive Plants in The Midwest Symposia, Dec. 11-14, Milwaukee, WI
2006 Davis, J. A., D. W. Ragsdale, and E. B. Radcliffe. Section F Symposium: Ecology and Management of Insect Vectors of Plant Pathogens in Vegetable Crops: Why PVY can no longer be controlled in seed potatoes. 54th Entomol. Soc. Am., Indianapolis, IN, 11Dec 2006.
2007 Sezen, Zeynep, R. L Koch, G. E. Heimpel, P. M. Porter, D. W. Ragsdale, and B. D. Potter. Effects of a fall-seeded rye cover crop on soybean aphid suppression in organic systems. Annual Meeting Entomological Society of America, 9-12 December 2007, San Diego, CA.
2007 McCornack, B. P., A. C. Costamagna, E. C. Burkness, W. D. Hutchison, and D. W. Ragsdale. Within-plant distribution of soybean aphid (Hemiptera: Aphididae) and development of node-based sample units for estimating whole-plant densities in soybean. Annual Meeting Entomological Society of America, 9-12 December 2007, San Diego, CA
2007 Costamagna, A. C., B. P. McCornack, and D. W. Ragsdale. Incorporating natural enemies into current economic thresholds for soybean aphid. Annual Meeting Entomological Society of America, 9-12 December 2007, San Diego, CA
2007 K. A. Koch and D. W. Ragsdale. The effect of soybean rust fungicides on artificially-induced soybean aphid fungal epizootics. Annual Meeting Entomological Society of America, 9-12 December 2007, San Diego, CA
2007 Skinner, L. C., and D. W. Ragsdale. Population dynamics and long-term effects of Galerucella spp. on purple loosestrife, Lythrum salicaria L., and non-target native plant communities in Minnesota. Annual Meeting Entomological Society of America, 9-12 December 2007, San Diego, CA
2007 Ragsdale, D. W., E. W. Hodson, B. P. McCornack, R. C. Venette, L. M. Behnken, M. O'Neal, K. Johnson, E. Cullen, H. Kraiss, C. D. DiFonzo, K. Koch, T. Hunt, B. D. Potter, P. Glogoza, and R. J. O'Neil. Soybean Aphid: A Regional Approach to Management of an Invasive Insect. North Central Branch Entomological Soc. of Amer., March 25-28, 2007, Winnipeg, MB Canada.
2008 Ian V. MacRae, Edward B. Radcliffe and David W. Ragsdale. Site Specific Management Resulting in Conservation of Natural Enemies. North Central Branch Entomological Soc. of Amer., March 24-27, 2008, Columbus, OH.
2008 David W. Ragsdale. Learning to Manage the Soybean Aphid: Assessing Biological Control and Establishing Economic Thresholds. North Central Branch Entomological Soc. of Amer., March 24-27, 2008, Columbus, OH.
2008 McCornack, B.P., K.A. Koch, and D.W. Ragsdale. Thiamethoxam and soybean phenology effects on soybean aphid (Aphis glycines) population dynamics. Poster. Entomological Society of America Annual Meeting, 16-19 November 2008, Reno, NV
2008 Costamagna, A.C., B.P. McCornack, and D.W. Ragsdale. Changes in within-plant quality mediate predator impacts on aphids. Ten-minute talk. Entomological Society of America Annual Meeting, 16-19 November 2008, Reno, NV
2008 Koch, K.A. and D.W. Ragsdale. Effects of fungicide timing and active ingredient on soybean aphid fungal epizootics. Ten-minute talk. Entomological Society of America Annual Meeting, 16-19 November 2008, Reno, NV
2008 Ragsdale, D.W. Robert O'Neil's contribution to soybean aphid biological control. IOBC Symposium. Entomological Society of America Annual Meeting, 16-19 November 2008, Reno, NV
2008 Koch, K.A. and D. W. Ragsdale. Secondary effects of fungicides on fungi infecting the invasive soybean aphid. Minnesota Invasive Species Conference. 26-29 October. Duluth, MN
Invited Symposia and Seminars (41 Total)
Ragsdale, D. W. 1981. Development of an enzyme-linked immunosorbent assay for determining the predators of Nezara viridula eggs and nymphs. Symposium "Serological Methods in Insect Ecology". Entomol. Soc. Amer., Annual Meeting San Diego, Calif. November 29 - December 3, 1981.
Ragsdale, D. W. 1979. Isolation and identification of microorganisms associated with the feeding process of Nezara viridula (L.). Louisiana State University, Department of Microbiology.
Ragsdale, D. W. 1980. Development and use of an ELISA for a quantitative determination of predation on the southern green stink bug. Louisiana State University, Department of Microbiology.
Ragsdale, D. W. 1981. Soybean Integrated Pest Management. Point Loma College. Biology Department.
Ragsdale, D. W. 1981. Epidemiology of bean pod mottle virus within its vector, the bean leaf beetle in Louisiana.
Ragsdale, D. W. 1983. The bean leaf beetle - a Minnesota soybean pest?. University of Minnesota, Entomology Department.
Ragsdale, D. W. 1986. Serological detection of Acarapis woodi parasitism using monoclonal antibodies. University of Minnesota, Entomology Department.
Ragsdale, D. W. and B. Furgala. 1986. Progress on New Detection Methods for Acarapis woodi. Honey Bee Tracheal Mite (Acarapis woodi, R.) Scientific Symposium. July 8-9 1986. Saint Paul, MN.
Ragsdale, D. W. 1986. Update on a serological test for tracheal mites. Minnesota Honey Producers Summer Meeting, Fergus Falls, Minnesota
Ragsdale, D. W. & E. B. Radcliffe. 1988. Pest, pesticides and importance: The Aldicarb Story. University of Minnesota, Soil Science Department.
Ragsdale, D. W. 1989. Evaluation of an immunological test for diagnosing low level tracheal mite infestation. American Assoc. of Professional Apiculturists. Honey Bee tracheal mite symposium. Weslaco, Texas. Oct. 1-2, 1989.
Ragsdale, D. W. 1989. Serological analysis - applications to entomological research. University of Arizona, Carl Hayden Bee Research Center and Center of Insect Science, Tuscon Arizona.
Ragsdale, D. W. 1990. Action thresholds for an aphid vector of potato leafroll virus. Potato Integrated Pest Management in the North Central United States. Accomplishment and Priorities for the 1990's. St. Paul, Minn. June 20-21, 1990.
Ragsdale, D. W. 1991. Evaluate the impact of insects established for biological control of leafy spurge. Leafy Spurge Control Coordination/Planning Meeting (CPM). Minneapolis, Minn. April 23-25, 1991.
Ragsdale, D. W. 1991. Spread of potato viruses in the field with reference to PLRV and potato virus Y. International Conference on Potato Pest Management. Jackson, Wyoming October 12-17, 1991.
Ragsdale, D. W. 1992. Research directions - how decisions are made and who funds the vector biology program. Minnesota Institute for Sustainable Agriculture - Board Meeting, University of Minnesota. April 8, 1992.
Ragsdale, D. W. 1992. Environmental assessment for release of an exotic pathogen of the European corn borer, Department of Agronomy and Plant Genetics, University of Minnesota. November, 1992.
Ragsdale, D. W. 1994. A decade of research with aphid vectored potato viruses - what have we learned, what can we apply? Department of Plant Pathology, University of Minnesota. October, 1994.
Ragsdale, D. W. 1994. Biological control research at the Unversity of Minnesota. Minnesota Extension Service, Annual Conference. October, 1994.
Ragsdale, D. W. 1995. Epidemiology and control of aphid transmitted potato viruses in the Red River Valley of Minnesota and North Dakota, University of Maine, February, 1995.
Ragsdale, D. W. 1995. Current status of collaboration in Russia: ConAgra Project, May, 1995.
Ragsdale, D. W. 1995. Use of Crop Borders to Reduce potato virus Y in seed potato. New Brunswick 1995 Potato Conference, February, 1995.
Ragsdale, D. W. 1995. User action thresholds for potato leafroll virus (PLRV). Formal Conference on Vegetable Entomology, 1995 ESA Annual Meeting, December, 1995.
Ragsdale, D. W. 1996. The impact of plant biotechnology on potato pest management and the potato industry - The ecological impacts of insect and virus resistance in potatoes. Potato Association of America, August, 1996.
Ragsdale, D. W. 1996. Rearing Gallerucella spp. for purple loosestrife control. Minnesota DNR, Resource Managers Training Workshop, January, 1996.
Ruano-Rossil, J. [presenter], D. W. Ragsdale, and E. B. Radcliffe. 1998. Interference of Potato Late Blight Fungicides with Fungal Entomopathogens of Green Peach Aphid, British Mycological Society, “The Future of Fungi in the Control of Pests, Weeds, and Diseases” section, poster presentation), 5-9 April 1998, Southampton University, United Kingdom
Ragsdale, D. W. 1998. Purple loosestrife biological control: Minnesota cooperator rearing program. North Central Branch, Entomological Society of America. March 1998. Biological Control of Weeds Symposium.
Ragsdale, D. W. 1998. “Potato Fungi: The Good and the Bad,”, Department of Plant Pathology, North Dakota State University, 20 February 1998. (D. W. Ragsdale [presenter] with E. B. Radcliffe)
Ragsdale, D. W. 1998. Interactions of Late-Blight Fungicides with Entomopathogenic Fungi. Department of Plant Pathology, University of Minnesota, 26 October, 1998. (D. W. Ragsdale [presenter] with C. Donaldson, J. Ruano-Rossil, C. Longtine, and E. B. Radcliffe)
Ragsdale, D. W. 1999. University of Wisconsin, 3 December 1999. (D. W. Ragsdale) [presenter]. Is Integrated Pest Management of Green Peach Aphids Possible?
Ragsdale, D. W. 1999. Is Integrated Pest Management of Green Peach Aphid in Potatoes Possible? December 3, 1999. University of Madison, Wisconsin, Entomology Department.
Ragsdale, D. W. 1999. Aphid Biology and Virus Spread. December 2, 1999. National Seed Seminar, Madison, WI.
Ragsdale, D. W. 2000. Current Research and Trends in Insect Vectors of Plant Pathogens. BCE Symposium. National ESA Meeting, Montreal, Canada, December 2000.
Ragsdale, D. W. 2002. Biology, Distribution, and Control of Soybean Aphid. American Seed Trade Association. Annual Meeting, Chicago, Illinois, December 2002.
Ragsdale, D. W. 2003. University of Minnesota, Department of Plant Pathology Graduate Student Symposium, The Future of Plant Health: A Multidisciplinary Vision. Understanding the role of vector ecology in the spread of aphid transmitted potato viruses. 8 September 2003.
Ragsdale, D. W. 2003. Managing insect-vectored diseases through trap cropping. In Insect Behavior, Plant Biology, and Landscape Management to Control Insect Pests. Annual Meeting, Entomological Society of America, Cincinnati, 26-30 October 2003.
Ragsdale, D. W. 2006. National IPM Symposium. Soybean Aphid IPM. Indianapolis, IN, 4-7 April, 2005.
Koch K. A. and D. W. Ragsdale. 2007. Potential impact of soybean rust disease management on soybean aphid populations. Annual Meeting Entomological Society of America, 9-12 December 2007, San Diego, CA.
Ragsdale, D.W. 2007. Application of vector ecology in management of PVY and PLRV in seed potato. 63rd Annual Meeting of the Entomological Society of Manitoba. 3 November 2007. Winnipeg, MB, Canada.
Ragsdale, D. W. 2007. Soybean Seed Treatment – Does thiamethoxam to control soybean aphid in Minnesota. Soybean Seed Treatment Symposium. 7-9 March 2007. Tucson, AZ
Ragsdale, D. W. 2008. Role of Climate Change on Virus/Vector Relations. Ames, IA, 30 October 2008. Soybean Virus Diseases NCERA 200.
Ragsdale, D.W. 2008. Robert O'Neil's contribution to soybean aphid biological control. IOBC Symposium. Entomological Society of America Annual Meeting, 16-19 November 2008, Reno, NV
Ragsdale, D.W. and L. C. Skinner. 2009. Purple loosestrife biocontrol: A cooperative rearing program that helped Minnesota conquer this invasive weed. North Central Branch, Entomological Society of America, 15-18 March 2009, St. Louis, MO
Ragsdale, D.W. 2009. Soybean Aphid: From Thresholds to Biocontrol. Symposium: Integrating strategies for invasive species management: Capacity, Compatibility, and Operational Challenges. 6th International Integrated Pest Management Symposium, 24-26 March 2009, Portland, OR.
Extension Meetings, presentations, seminars, and workshops (10% appointment began in 1998):
1998
“Aphids and Seed Potato Production” Red River Valley Potato Growers Meeting, 6 January 1998, Minnesota Seed Potato Growers Annual Meeting, (D. W. Ragsdale [presenter] with E. B. Radcliffe)
“Interactions among Late Blight Fungicides, Insecticides, and Green Peach Aphids” Potato Extension Meeting, Grafton, ND, 17 February, (D. W. Ragsdale [presenter] with E. B. Radcliffe)
“Interactions among Late Blight Fungicides Insecticides, and Green Peach Aphids”, Valley Potato Expo, Grand Forks, ND, 18 February, (D. W. Ragsdale [presenter])
“Research Update: Aphids, Colorado Potato Beetle and Potato Leafhoppers” Area II Potato Growers Annual Meeting, Monticello, 5 March, (D. W. Ragsdale [presenter] with E. B. Radcliffe)
“Purple Loosestrife Biological Control Program”, State Department of Transportation, 1 April, (Alyson Loose [presenter] with D. W. Ragsdale and L. Skinner)
“Purple Loosestrife Training Workshop on Rearing Biological Control Agents”, 22 April (Twin Cities), 23 April, Brainerd, MN, (Alyson Loose [presenter] with D. W. Ragsdale and L. Skinner)
“Purple Loosestrife Biological Control – Training Workshop for Blackhawk Middle School” 28 April, (D. W. Ragsdale [presenter])
“Purple Loosestrife Biological Control – Training Workshop for School of Environmental Studies” 18 May, (D. W. Ragsdale [presenter])
Scout training school, RDO company, 1 June, Park Rapids, MN, (D. W. Ragsdale [presenter])
“Aphids and Seed Potato Production” Wisconsin Seed Potato Producers, 15 June, Stevens Point, Wisconsin (E. B. Radcliffe [presenter] with D. W. Ragsdale)
In field presentation at Area II Potato Growers Association, Field Day, 16 July, Becker, MN. (D. W. Ragsdale and E. B. Radcliffe, co-presenters)
“Update on Aphids and Potato Viruses in Seed Potato Production” Minnesota Seed Potato Growers Summer Meeting, 20 July, Fergus Fall, MN, (D. W. Ragsdale, E. B. Radcliffe, and R. Suranyi jointly presented the aphid trapping network, Aphid Alert and Rapid Response Program)
Presentation “Impact of Fungicides on Green Peach Aphid on Potatoes,” 13 August, Field Day, Staples, MN, (D. Ragsdale [presenter] with E. B. Radcliffe)
Presentation, Potato Research Farm Field Day, Grand Forks, ND, 20 August, Red River Valley Potato Growers Association, (D. W. Ragsdale [presenter] with E. B. Radcliffe)
Presentation, Minnesota Certified Seed Potato Growers Association, 20 November, 1997, (D. W. Ragsdale [presenter] with E. B. Radcliffe)
Presentation to Area II Potato Growers Research Update Meeting, St. Paul, Hayes Hall, 24 November 1998 (D. W. Ragsdale [presenter] with E. B. Radcliffe)
1999
Small grain and potato Expo, Fargo, 10 February 1999. Green peach aphids, a new threat from an old pest” (E. B. Radcliffe [presenter] with D. W. Ragsdale, and R. Suranyi)
Area II Potato Growers Annual Meeting, “Mid-season insecticide applications, the trigger for exploding green peach aphid populations”, 5 March 1999 Monticello, Minnesota (D. W. Ragsdale [presenter]).
Area II Potato Growers Annual Meeting. 1999. “Mid-season insecticide applications, the trigger for exploding green peach aphid populations”, D. W. Ragsdale [presenter], with E. B. Radcliffe. 4 March Monticello, Minnesota (75 growers, crop consultants and ag professionals)
Scout training school, RDO company. 1999. D. W. Ragsdale [presenter] and R. Suranyi. June 1. Park Rapids, MN (20 crop consultants who manage 40 acres of potatoes in 3 states)
Tri-Campbell farms, Field day. 1999. D. W. Ragsdale [presenter]. 12 July, Perham, MN. In field demonstrations and informal discussions with area growers, consultants, aerial applicators and field scouts (60 attendants).
Minnesota Seed Potato Growers Summer Meeting, Warroad, MN “Update on Aphids and Potato Viruses in Seed Potato Production”, E. B. Radcliffe and R. Suranyi. 19 July. (40 growers, ag professionals, MDA staff)
Area II Potato Growers Association, Field Day. 1999. D. W. Ragsdale and E. B. Radcliffe, co-presenters, 20 July, Becker, MN. (60 growers, ag professionals and crop consultants)
Red River Valley Potato Growers Association, Potato Research Farm Field Day. 1999. R. Suranyi [presenter], D. W. Ragsdale and E. B. Radcliffe, 20 August, Grand Forks, North Dakota (90 growers, ag professionals, crop consultants)
Novartis Potato Solutions Field Day, K & O Farms, Clear Lake, Minnesota. 1999. D. Ragsdale, Aphid control practices. 25 August, Clear Lake, Minnesota. Presentation and distribution of 1999 insecticide trials, highlighting Novartis products. (20 growers, crop consultants, ag professionals)
SMVGA (Hollandale Marketing Association) Field Day. 1999. D. Ragsdale, Aphid control practices. 26 August, Hollandale, Minnesota. Presentation and distribution of 1999 insecticide trials. (30 growers, crop consultants, ag professionals)
Red River Valley Potato Growers Association, Annual Meeting and Potato Health Workshop. 1999. D. Ragsdale [presenter]. 19-20 November, Fargo, North Dakota. Aphid Biology and Virus Spread. (200 growers, crop consultants, ag chemical professionals).
Red River Valley Potato Growers Association, Annual Meeting and Potato Health Workshop. 1999. R. Suranyi [presenter], D. Ragsdale, E. Radcliffe, I. MacRae and B. Lockhart. 19-20 November, Fargo, North Dakota. Monitoring Aphid Flight Activity in Minnesota and North Dakota. (200 growers, crop consultants, ag chemical professionals).
Novartis Potato Seminar. 1999. D. Ragsdale [presenter], E. B. Radcliffe. 29-30 November. Fulfill (pymetrozine) and PLRV Research at the University of Minnesota. Tucson, AZ. (75 research scientists, crop consultants and company representatives from North America).
2000
Idaho Crop Improvement Association. 2000. D. Ragsdale [presenter]. Management of Aphid Transmitted Viruses, 18 January. Pocatello, Idaho.
Idaho Potato School Seminar. 2000. D. Ragsdale [presenter]. Management Practices for PLRV and Net Necrosis, 19 January. Pocatello, Idaho.
Idaho Potato School Workshop. 2000. D. Ragsdale [presenter]. Insect Management. 20 January. Pocatello, Idaho. (2 sessions with 125 growers each session).
Wisconsin Seed Potato Improvement Association, Inc. 2000. D. Ragsdale [presenter]. IPM for aphid transmitted viruses in seed potato. 9 February. Antigo, Wisconsin (keynote speaker with 100 seed growers, consultants and industry representatives in attendance).
Valley Potato Expo. 2000. Concerns and questions on late blight, pink rot and viruses – open panel discussion. Panel Members: Gudmestad, Secor, Miller, Radcliffe and Ragsdale.
Valley Potato Expo. 2000. D. Ragsdale [presenter]. Aphid update in the Red River Valley. 16 February, Fargo North Dakota (300 growers, consultants and industry representatives in attendance).
Minnesota Seed Potato Growers Annual Meeting. Aphids and virus control in the Valley. . 16 February, Fargo North Dakota (50 growers and industry representatives in attendance).
Prince Edward Island Potato Virus Workshops. 2000. D. Ragsdale [presenter]. Aphid population dynamics and factors affecting the spread of PVY (mosaic) and PLRV (leafroll). 21 February Prince Edward Island, Canada. 4 presentations in 2 days to over 800 growers, consultants and industry representatives.
Area 2 Potato Growers, winter meeting. “Aphid trapping network and insecticide efficacy reports”. Big Lake, MN 9 March 2000. (D. W. Ragsdale [presenter] & E. B. Radcliffe). 75 growers and industry representatives
Washington State Potato Growers, processor meeting. “Aphid response to new insecticides for PLRV control”. 15-17 March. 3 presentations in 2 days, with 200 growers and industry representatives, D. W. Ragsdale [presenter]
Zeneca Ag. Products, Industry Update. “Fulfill and PLRV spread”, 30 March - 2 April, 2000. Cabo San Lucas, Mexico. D. W. Ragsdale [presenter] and E. B. Radcliffe [presenter].
Cooperator Insect Rearing Training Session, Brainerd, Minnesota, 26 April 2000, Luke Skinner [presenter], Alyson Milles [presenter], and D. W. Ragsdale. 100 cooperators given rearing kits for beetle rearing.
Scout training school, RDO Company. 2000. D. W. Ragsdale [presenter]. 12 June, 2000. Park Rapids, MN (20 crop consultants who manage 40,000 acres of potatoes in 3 states)
Field tour for Novartis Crop Protection, Management group from Basil Switzerland. 14-15 August, Rosemount, Minnesota. 10 local product reps and 4 Senior Managers from Basil, Switzerland and Greensboro, North Carolina corporate office.
Red River Valley Potato Growers Association, Potato Research Farm Field Day. 2000. R. Suranyi [presenter], D. W. Ragsdale and E. B. Radcliffe, 24 August, Crookston, Minnesota (90 growers, ag professionals, crop consultants)
Minnesota Soybean Producers, on-campus meeting with staff. D. Ragsdale [presenter] “Soybean aphid in Minnesota”. 8 September, 2000. Update on soybean aphid situation to date in Minnesota. Work on prioritizing soybean initiative for 2001 legislature
School of Environmental Science, Apple Valley, Minnesota. “BioBlitz” Helped students collect, pin and identify insects for teaching collection at the school. 21 September, 2000. 3 groups of 30 students.
Frenate, “How to prepare slides for a seminar” D. Ragsdale [presenter]
Novartis Potato Seminar. 2000. D. Ragsdale [presenter], E. B. Radcliffe. 6-9 November 2000. Fulfill (pymetrozine) and PLRV Research at the University of Minnesota. Fort Meyers, Florida (75 research scientists, crop consultants and company representatives from North America).
Red River Valley Potato Growers, Annual Meeting, 17-18 November Fargo, ND. D. W. Ragsdale, E. B. Radcliffe, R. Suranyi [presenter], M. Carrol [presenter].
Area II fall research report meeting, 20 November 2000. D. W. Ragsdale [presenter] with E. B. Radcliffe and J. Munyaneza, R. Suranyi, M. Carrol.
National Potato Council, Seed Seminar, 1 December, 2000. “Managing Aphid Transmitted Viruses” D. W. Ragsdale [presenter] 600 seed growers from around the nation.
National Potato Council, Seed Seminar, 2 December, 2000. “Entomopathogenic Fungi and late blight fungicides”. D. W. Ragsdale [presenter] 600 seed growers from around the nation.
2001
Michigan Seed Potato Growers. 1 February 2001. “Aphid Alert program in Minnesota and North Dakota. R. Suranyi [presenter], D. W. Ragsdale, E. B. Radcliffe, and I. V. MacRae.
Minnesota Seed Potato Growers Winter Meeting. 1 February 2001. “Aphid Alert update”. E. B. Radcliffe [presenter], M. Carroll, R. Suranyi, I. V. MacRae, and D. W. Ragsdale.
Ontario Horticultural Crops Conference. 13 February 2001. “New insecticides for Colorado potato beetle and aphid control. D. W. Ragsdale [presenter].
Red River Valley Potato Growers, 6 March 2001. “Potato research in the Red River Valley – update”. D. W. Ragsdale [presenter], E. B. Radcliffe, I. V. MacRae, R. Suranyi, and M. Carroll.
Minnesota Area II Potato Research and Promotion Council Potato Workshop. 13 March 2001. “Potato research update”. E. B. Radcliffe [presenter], D. W. Ragsdale, I. V. MacRae, R. Suranyi, and M. Carroll.
2002
Illinois Crop Protection Technology Conference 2002. 8 January 2002. Insect Vectors of Plant Pathogens: Implications for Crop Protection. D. W. Ragsdale [presenter]
Soybean Production Conference 2002. 29 January 2002. Catching Up to the Soybean Aphid: Its Spread, Damage, Management & Prognosis for 2002. Ken Ostlie, Dave Ragsdale [presenter], Fritz Breitenbach, Bruce Potter, and Rob Venette. Wilmar, Minnesota.
Minnesota Soybean Growers, Research and Promotion Council. 6 February 2002. Soybean Aphid: Its Spread, Damage, Management & Prognosis for 2002. D. W. Ragsdale [presenter], Ken Ostlie, Fritz Breitenbach, Bruce Potter, Erin Hodson, and Rob Venette. St. Paul, Minnesota
Chisago County Soybean Production Update. 12 February 2002. Soybean Aphid in Minnesota - A new threat to soybean production. D. W. Ragsdale [presenter], Ken Ostlie, Erin Hodson, and Rob Venette, North Branch, Minnesota
Regional Soybean Committees Joint Meeting, 17 February 2002. Biological Control of Soybean Aphid. D. W. Ragsdale [presenter], Bob O’Neil, George Heimpel, Dave Voegtlin, and Keith Hopper, St. Louis, Missouri.
North Central Research Committee, NC200, Soybean breeding. 18 February 2002. Soybean Aphid, Aphis glycines- A new threat to soybean production. D. W. Ragsdale [presenter]. St. Louis, Missouri
Commodity Classic, North Central Soybean Research Program, Research Board. 19 February 2002. Assessing and Managing Risks from Soybean Aphid in the North Central US. D. W. Ragsdale [presenter], R. Venette, B. O’Neil, C. DiFonzo, R. Hammond. Nashville, Tennessee.
Potato and Small Grain Expo. 21 February 2002. Research update on insects pests of potato. E. B. Radcliffe [presenter], D. W. Ragsdale, R. Suranyi, M. Carroll, and M. Zhu. Fargo, North Dakota.
Area II Potato Growers Annual Conference. 26 February 2002. Insecticide Efficacy Trials, 2001 and update on Soybean Aphid in Minnesota. Joseph Munyaneza [presenter], D. W. Ragsdale, and E. B. Radcliffe. Monticello, Minnesota.
West Central Inc. Winter Meeting. 26 February 2002. Soybean Aphid: Its Spread, Damage, Management & Prognosis for 2002. D. W. Ragsdale [presenter], Ken Ostlie, Fritz Breitenbach, Bruce Potter, Erin Hodson, and Rob Venette.
Prince Edward Island Potato Conference. 27-28 February 2002. Suppression of virus spread in seed potato production. D. W. Ragsdale [presenter], E. B. Radcliffe, R. Surany, M. Carroll, and M. Zhu. Charolettetown, P.E.I. Canada.
RDO Corporation, Scout Training. 12 June 2002. Insect Pests of Potato. D. W. Ragsdale [presenter]. Park Rapids, MN.
2002 Ag Professional Field School, 16 July 2002. Soybean aphid in 2002. D. W. Ragsdale [presenter on 16 July], K. Ostlie, F. Breitenbach, B. Potter. Lamberton, MN
Ridgetown Potato School. 19 June 2002. Suppression of virus spread in seed potato production. D. W. Ragsdale [presenter], E. B. Radcliffe, R. Surany, M. Carroll, and M. Zhu. Ridgetown, Ontario, Canada.
Midwest Soybean Conference. 2-3 August 2002. Aphids and bean leaf beetles. D. W. Ragsdale [presenter], R. Venette, K. Ostlie, C. DiFonzo, R. O’Neil, & R. Hammond. Minneapolis, Minnesota.
Crop Pest Management Short Course, 25 November 2002. Soybean Aphid Update: The 2002 Story. Panel Members, Ian MacRae, Bruce Potter, Dave Ragsdale, Fritz Breitenbach. St. Paul, Minnesota.
Northern Plains Potato Growers. Aphid Alert update. R. Suranyi [presenter], E. B. Radcliffe, D. W. Ragsdale, I. V. MacRae. Fargo, North Dakota, 15 November 2002.
Cruiser COI Meeting, Soybean Aphid. Soybean Aphid – Biology & Yield Component Analysis. D. W. Ragsdale [presenter], B. McCornack, R. Venette, K. Ostlie, I. V. MacRae, B. Potter. Syngenta Crop Protection, Chicago, Illinois, 9 December 2002.
Management Strategies for PLRV and PVY, two aphid-transmitted potato viruses. Edward B. Radcliffe [presenter], David W. Ragsdale, and Robert A. Suranyi. National Potato Council, Seed Seminar. Portland, Maine, 5 December 2002.
2003
Invasion Biology Research Consortium. Damage Potential of the Soybean Aphid. D. W. Ragsdale [presenter], K. Ostlie, R. Venette, B. P. McCornack, E. Hodgson. Chanhassen, MN 15 January 2003
Invasion Biology Research Consortium. Overwintering Biology of Soybean Aphid. R. Venette, [presenter], I. MacRae, D. W. Ragsdale, B. McCornack. Chanhassen, MN 15 January 2003
Invasion Biology Research Consortium. Parasitoid Release Against Soybean Aphid. G. Heimpel, [presenter], Z. Wu, L. Weiser, D. W. Ragsdale, B. P. McCornack, I. V. MacRae, E. Hodgson. Chanhassen, MN 15 January 2003
Area II Potato Grower Association, Winter Educational Meeting. Aphid update, soybean and potato pest management. D. W. Ragsdale [presenter], E. B. Radcliffe, J. Davis, R. Suranyi, M. Carroll, M. Zhu, B. McCornack, E. Hodgson. Monticello, MN. 4 February 2003
Northern Plains Potato Growers Association. 2003 Potato Reporting Conference. Aphid Alert and Insecticide Issues. D. W. Ragsdale [presenter], E. B. Radcliffe, I. V. MacRae, R. Suranyi, M. Carroll, M. Zhu, J. Davis. Grand Forks, ND. 18 February 2003.
North Central Soybean Research Program. 2003. Management of soybean aphid in the North Central U.S., D. W. Ragsdale [presenter]. Charlotte, NC. 25-26 February 2003.
Quad State Potato Meeting. 2003. Minnesota Potato Research Reporting Conference. Madison, WI. 2-3 April 2003.
Biological Control: Risks and Benefits: A Research Symposium. Organized by the IBRC. Coordinating Committee: D. Ragsdale, G. Heimpel, R. Newman, and D. Larson co-organizers. St. Paul, MN, 27-29 May 2003.
Dedication of the High Security Containment Facility. Speakers: Gene Hugoson - Commissioner, MN Department of Agriculture, Chuck Musoplat - Dean of COAFES, Christine M. Maziar, Executive Vice President and Provost, David Ragsdale - Professor and Quarantine Officer, Dharma Sreenviasam - MN Depart of Ag (former). 30 May 2003
Minnesota Soybean Research and Promotion Council, SE Minnesota Listening Session. Presentation of insecticide efficacy data, D. W. Ragsdale and K. Ostlie [both presenters]. 31 July. Owatonna, MN
Minnesota Department of Finance executive budget office, with Scott Masters - Dept. of Finance; Becky Leschner, Gerald Heil, Mary Hanks, MDA, F. Pfleger, Plant Pathology, Bev Durgan, COAFES administration. Tour and presentation [by D. W. Ragsdale] of the High Security Containment Facility. 1 October 2003. St. Paul, MN
Legislative Commission on Minnesota Resources, Metro Tour. The institutional investment in the High Security Containment Facility [D. W. Ragsdale, presenter]. 7 October 2003. St. Paul, MN
23rd Annual Crop Pest Management Short Course. 2003. Progress in development of thresholds for the soybean aphid. D. W. Ragsdale [presenter], R. C. Venette, B. P. McCornack, K. Ostlie, B. Potter, I. V. MacRae. St. Paul, MN. 24 November 2003.
Northern Plains Potato Grower Association. 2003. The Former Aphid Alert Program. D. W. Ragsdale and M. Carroll. Fargo, ND. 14 November 2003.
Syngenta Potato Technical Meeting – COI. 2003. Insecticide performance in Minnesota. E. B. Radcliffe [presenter], J. A. Davis and D. W. Ragsdale. Vero Beach, FL. 12-15 Nov 2003.
Iowa Independent Crop Consultants. 2003. Management of soybean aphid in the north central U.S. D. W. Ragsdale [presenter], R. C. Venette, B. P. McCornack, K. Ostlie, B. Potter, I. V. MacRae. 2 December 2003. Ames, IA
Delegation from Chongqing, China. 2003. Virtual Tour of Quarantine Facility and Biological Control of Soybean Aphid. 3 December 2003. St. Paul, MN.
United Soybean Board and NCSRP Board of Directors meeting. Management of soybean aphid in the north central U.S. D. W. Ragsdale [presenter], R. C. Venette, B. P. McCornack, K. Ostlie, B. Potter, I. V. MacRae. 4-5 December 2003. St. Louis, MO.
North Central Soybean Aphid Extension Conference. D. W. Ragsdale [presenter]. Economic thresholds established using the NCSRP funded project. 10-11 December 2003. Chicago, IL.
2004
3rd Annual IBRC Retreat and Symposium, Garlic mustard biocontrol, D. W. Ragsdale, R. Becker, and J. Katovich (presenter), 8 January 2004, Landscape Arboretum
Invasive Species Conference, Presentation on BL2 facility in Minnesota and opening for a quarantine officer. 27-28 January 2004. Denver, CO.
Minnesota Certified Seed Potato Growers Association, D. W. Ragsdale and M. Carroll. – Update on the Aphid Alert Program. Fargo, ND
Advanced Crop Advisors Workshop. Soybean Aphid Management in the North Central States. D. Ragsdale [presenter], 19 February 2004, Fargo, ND
Northern Plains Potato Growers Association, Annual Meeting. Minnesota Seed Growers Assoc. Meeting. 23 February 2004. East Grand Forks, ND
Minnesota Area II Potato Growers 14th Annual Educational Workshop. 24 February 2004. Alida Event Center, Big Lake, MN. Soybean aphid – what every grower needs to know. D. Ragsdale (presenter)
West Central Inc. Owatonna Spring Agronomy Update. Soybean Aphid Management in the North Central States. D. Ragsdale [presenter], 25 February 2004, Owatonna, MN
Legislative Update on BL3. Use of the current BL2 facility [D. Ragsdale, presenter]. Minnesota legislative staff. St. Paul Campus, 21 April 2004.
Potato Scout School, RDO corporation, Potato Insects – thresholds, insecticide choice and chemical rotation for resistance management. Park Rapids, MN. 8 June 2004.
Minnesota Area II Potato Council Field Day, Becker Sand Plains Experiment Station. 27 July 2004. Poster presentation (no field plots available).
Northern Plains Potato Growers Association, Annual Field Days, 29 July 2004, Grand Forks, ND. In-field presentation by Ragsdale.
Minnesota Soybean Research and Promotion Council Research Tours. Rosemount Field Tour, 8 Sep 2004. D.Ragsdale [presenter].
Crop Pest Management Short Course. Lethal and Sublethal Effects of a seed treatment for soybean aphid, D. Ragsdale [presenter] and B. McCornack. 22 November 2004, St. Paul, MN
North Central Soybean Research Program – Results Meeting, 2004. Minnesota Update [D. Ragsdale, presenter]. 2 December 2004, Chicago, IL
Crop Pest Management Short Course. How extreme hot and cold temperature affect soybean aphid survival. B. McCornack [presenter] and D. Ragsdale. 22 November 2004, St. Paul, MN
2005
Minnesota Soybean Research and Promotion Council, Board Meeting. COAFES and MDA Biocontainment Facility. D. Ragsdale [presenter] and Z. Wu. 28 January 2005, St. Paul, MN
Wisconsin Annual Potato Meeting. Viruses, Vectors, & Vegetation – Aphids and Leafhopper Challenges in Potato, D. Ragsdale [presenter]. 15 February 2005, Stevens Point, WI
Wisconsin Annual Potato Meeting. Insect Management in Seed Potato Production, D. Ragsdale [presenter]. 16 February 2005, Stevens Point, WI
Minnesota Area II Potato Growers 15th Annual Educational Workshop. Insecticide Resistance Management, “Why we need it!”, D. Ragsdale [presenter]. 22 February 2005, Salida Center, Big Lake, MN
Spud Solutions meeting. Syngenta Crop Protection Producer meeting. At-planting treatments on potato insect pests & insecticide resistance management, D. Ragsdale [presenter]. 24 February 2005, Salida Center, Big Lake, MN
UMore Park Open House. Soybean aphid and biological control, D. Ragsdale [presenter]. 18 August 2005. Rosemount, MN
New and Emerging Virus Diseases of Soybeans in the North Central States, Biology of the soybean aphid, Aphis glycines, in the North Central States, D. W. Ragsdale [presenter]. 24 October 2005, Ames, IA
Montana Seed Potato Certification Program Annual Seed Potato Seminar, NCERA 200 invited speaker. Insect Management in Seed Potato Production, D. W. Ragsdale [presenter]. 11 November 2005, Missoula, MT.
Potato Growers of Alberta, Seed Potato Annual General Meeting. Insect Management in Seed Potato Production, D. W. Ragsdale [presenter]. 15 November 2005, Calgary, Alberta, Canada
2006
Biosafety Level 2 and 3 Tour and Presentation on Research Activity in BSL2, D. W. Ragsdale [presenter]. 9 January 2006. Legislative Aids, State of Minnesota.
Minnesota Soybean Research and Promotion Council, Board Meeting. D. Ragsdale [presenter] and G. Heimpel. Soybean Aphid Research in Minnesota, 2006. 18 January 2006, St. Paul, MN
Minnesota Area II Potato Growers 16th Annual Educational Workshop. Impaired stand favors PVY spread in potato. J. Davis, [presenter], D. Ragsdale and E. B. Radcliffe. 21 February 2006, Salida Center, Big Lake, MN
North Central Soybean Research & Promotion Council. D. Ragsdale [presenter] and R. O’Neil. Soybean Aphid Management in the North Central States & Biological Control of the Soybean Aphid. 1 March 2006, Anaheim Convention Center – Corn and Soybean Classic, Anaheim, CA.
Bayer Crop Sciences. D. Ragsdale [presenter]. Insecticide Resistance Management in Minnesota. 7-9 March 2006, San Antonio, TX
WERA 89. D. Ragsdale [presenter]. Potato Virus Y in Minnesota Seed Potatoes. 16 March 2006
IPM Symposium, D. Ragsdale [presenter]. Soybean Aphid and the Challenge of Integrating Recommendations within an Integrated Pest Management System. 3 March 2006, St. Louis, MO.
Disease and Insect Tour. D. Ragsdale [presenter]. Soybean Aphid Economic Thresholds Customized to Fit Your Production System. Southern Research and Outreach Center, 3 August 2006, Waseca, MN.
Biocontainment Quarantine Facility, presentation and tour. D. Ragsdale [presenter], Minnesota Agri Growth Council, 10 August 2006, St. Paul, MN
Soybean Aphid and Their Natural Enemies, B. McCornack [presenter], D. Ragsdale, A. Costamagna. Crop Professional Field School, 18-19 July 2006, Rosemount, MN
CPM Research Update, Soybean Aphid Economic Thresholds Customized to Fit Your Production System, Minnesota REE and IPM Specialists, Holiday Inn, 20 Nov 2006, Roseville, MN
Crop Pest Management Short Course, Soybean Aphid Economic Thresholds Customized to Fit Your Production System, D. Ragsdale [presenter]. Minneapolis Convention Center, 7 Dec 2006, Minneapolis, MN
Area II and Northern Plains Potato Growers Association, Reporting Conference, Holiday Inn, Alexandria, MN 21 November 2006.
Montreal Soybean Producers Association. Soybean Aphid Economic Thresholds. D. Ragsdale [presenter]. Montreal, Quebec CANADA, 5-6 Dec, 2006.
2007
Soybean Production Conferences. Overwintering models, suction trap data, soil and field locations – the Minnesota aphid story unfolds. Thresholds to predicting outbreaks - What we know, what we think we know and what we don't know. D. W. Ragsdale & B. C. McCornack.
• 17 January 2007 Jackpot Junction – B. McCornack – Score, 2.9 (4 pt scale, range 2.9-3.5)
• 18 January 2007, Owatonna – D. Ragsdale – Score, 3.4 (4 pt scale, range of all speakers 2.6-3.6)
• 24 January 2007, Princeton – D. Ragsdale – Score, 3.2 (4 pt scale, range of all speakers 3.0-3.8)
• 25 January 2007, Fergus Falls – D. Ragsdale – Score, 3.5 (4 pt scale, range of all speakers, 2.0 – 4.0)
Resistance Management for the Colorado Potato Beetle. International Crop Expo 2007. Grand Forks, ND, 22 February 2007.
Resistance Management for the Colorado Potato Beetle. Minnesota Area II Potato Growers Fifteenth Annual Educational Workshop. 27 February 2007, Big Lake, MN
Soybean Aphid Management Guidelines. Advanced Crop Advisors Workshop, NDSU Extension. Fargo, ND, 23 February 2007.
Managing Soybean Aphids in 2007: How Will Biological Control Contribute? On line course sponsored by the North Central Soybean Research Program. 6 March 2007. D. Ragsdale: Review of the situation with soybean aphids in the Midwest.
Protecting Crops from Insect and Disease Threats – The Value of the Insect and Plant Pathogen Quarantine Facilities. 1 June 2007, Congressman Tim Waltz and Staff, St. Paul, MN
Invasive Species Threats and the Use of the Quarantine Facility to Counter these Species using Biological Control. 19 June 2007. Legislative –Citizen Commission on Minnesota Resources, St. Paul, MN.
What’s New with Soybean Aphid. Crop Production Field Day, 12 July 2007. Southwest Research and Outreach Center, Lamberton, MN
Soybean Aphid Economic Thresholds. Lincoln County Plot Day, 20 July 2007. Lake Benton, MN.
Biological Control of Soybean Aphid. Disease and Insect Field Tour, 19 July 2007. Southern Research and Outreach Center, Waseca, MN
Soybean Aphid Research Update. NCSRP Board Meeting, 17 July 2007. Fargo, MN
Minnesota Soybean Day on Campus and MNSR&PC Board Meeting. BL2 Facility Tour and Update on Soybean Aphid Biological Control. 31 January 2007, St. Paul, MN
Minnesota Agriculture and Rural Leadership (MARL) Program. Biological Control of Soybean Aphid Using Asian Parasitoids and Tour of the BL2 Quarantine Facility. 19 January 2007, St. Paul, MN
Field Scout Training for Potato Insects. RDO Agronomy School. 7 June 2007. Park Rapids, MN
Classical Biological Control – Soybean Aphid and Purple Loosestrife – case studies. USDA Foreign Ag Service Junior Professionals. 19 September 2007. St. Paul Campus.
2008
Illinois Crop Protection Technology Conference. Fungicides: Do they adversely affect beneficial insect pathogens in multiple cropping systems? 10 January 2008. Urbana-Champaign, IL, ca. 650 in attendance
Winter Crops Day. Management of Soybean Aphid: Chemical, Cultural and Biological Control Methods. D. Ragsdale and A. Costamagna. Approx. 250 in total in attendance in 5 sessions.
• January 16, Waseca - D. Ragsdale and A. Costamagna.
• January 16, Lake Crystal - D. Ragsdale and A. Costamagna. Sc
• January 17, Kasson - D. Ragsdale and A. Costamagna.
• January 17, Wycoff - D. Ragsdale and A. Costamagna.
• January 18, Arlington – D. Ragsdale
Minnesota Organic Conference and Trade Show. From breeding to export: Organic Soybeans panel. Soybean Aphid Biology and Control. 18-19 January , St. Cloud, MN.
Institute for Ag Professionals. Crop Pest Management Short Course. What’s new with soybean aphid: from RagI resistant lines, to the ET for narrow row soybeans. 17 December 2008. Minneapolis, Minnesota. ca. 650 in attendance.
Indiana Certified Crop Agronomist Annual Meeting. What is an appropriate Economic Threshold (ET) as soybean prices fluctuate?. 15-16 December 2008. Indianapolis, Indiana. ca. 600 in attendance.
Northern Great Plains Soybean IPM Forum. Integrated Pest Management of Soybean Aphid. D. Ragsdale.
• 7 February 2008, Fargo/Moorhead, ND/MN – approx 100 in attendance
• 8 February 2008, Brookings, SD – approx 150 in attendance
AFE Crops Staff Development. Soybean Entomology Issues. 20 March 2008, St. Paul, MN.
Gates Foundation, Yvonne Pinto, Project Officer and Julian Smith, Consultant. Invasive species research and their importance to agriculture in Minnesota. 18 June 2008.
Global Forum on the Vigor Effect of Cruiser. Soybean aphid in North America. March 4-7 Lucerne, Switzerland.
Monsanto Soybean Aphid Summit. Soybean Aphid Biology. March 21-22, St. Louis, MO.
Monsanto Multifunctional Agricultural & Food System Fellowship. 14-15 July 2008. Creve Coeur, MO.
Soybean Disease and Insect Tour, Southern Research and Outreach Center, Waseca, Minnesota. , Soybean Aphid IPM. 12 August 2008.
National Soybean Leaders Tour, University of Minnesota. Soybean Aphid Field Research. 28 July 2008.
2009
