M.S. Department of Zoology, University of Maryland, College Park, MD.
Ph.D. Department of Entomology, University of Maryland, College Park, MD.
ENT 4015 Ornamental and Turf Entomology, from 2000 to 2014
ENT 5009/previously HORT 5009, Pesticides, from 2005 to 2014
Integrated pest management programs (IPM) promote the use of cultural, biological and chemical tactics to manage pest insects, while conserving pollinators and beneficial insects.
Nursery and landscape industries contribute around $147 billion each year to the U.S. economy and support over 600,000 workers. Over the last 20 years, public demand for high-quality ornamental plants has more than tripled, with more than $20 billion spent each year at retail and mail order stores on plants and associated products for lawns, parks, urban forests, golf courses, and athletic fields.
Beyond their economic value, these plants are integral to human health, recreation, and community pride. Properly placed and maintained landscapes absorb noise and air pollutants, purify water, reduce soil erosion, and provide wildlife habitat. Well maintained landscapes reduce crime and violence.
Concerns about environmental and human health risks have led to restrictions on many available insecticides and fungicides. For example, there are critical concerns about the impacts of insecticides on honey bees and native pollinators. In addition, heavy use of pesticides also increases the potential that pests and pathogens will develop resistance. For examples, golf courses along the East Coast have populations of annual bluegrass weevils that are resistant to pyrethroid insecticides.
Nurseries, greenhouses, landscapers, homeowners, and state agencies embrace IPM as an environmentally sensitive and economical approach combining natural plant resistance with available control tactics. These include monitoring, thresholds, biorational insecticide use, and judicious conventional insecticide use. Conserving pollinators and beneficial insects are vital part of IPM.
Krischik, V., M. Rogers, G. Gupta, and A. Varshney. 2015.Soil-applied imidacloprid is translocated to ornamental flowers and reduces survival of adultColeomegilla maculata, Harmonia axyridis, and Hippodamia convergens ladybeetles, and larval Danaus plexippus and Vanessa cardui. PLoS ONE, March 26
Scholer, J. and V. Krischik. 2014. Chronic exposure of imidacloprid and clothianidin reduce queen survival, foraging, and nectar storing in colonies of Bombus impatiens. PLoS ONE 9(3): e91573. doi:10.1371/journal.pone.0091573
Tenczar, E. G., and V. A. Krischik. 2007. Comparison of standard (granular and drench) and novel (tablet, stick soak, and root dip) imidacloprid treatments for cottonwood leaf beetle (Coleoptera: Chrysomelidae) management on hybrid poplar. J. Econ. Entomol. 100: 1611-1621.
Krischik, V. A., A .Landmark, and G. Heimpel. 2007. Soil-applied imidacloprid is translocated to nectar and kills nectar-feeding Anagyrus pseudococci (Girault) (Hymenoptera: Encyrtidae) Environ. Entomol. 36(5): 1238-1245.
Tenczar, E. G., and V. A. Krischik. 2007. Effects of new cultivars of ninebark on feeding and ovipositional behavior of the specialist ninebark beetle,Calligrapha spiraeae (Coleoptera: Chrysomelidae). HortScience 42(6): 1396-1399.
Rogers, M. A., V. A. Krischik, and L. A. Martin. 2007. Effect of soil application of imidacloprid on survival of adult green lacewing, Chrysoperla carnea(Neuroptera: Chrysopidae), used for biological control in greenhouse. Biological Control 42(2): 172-177.
Tenczar, E. G., and V. A. Krischik. 2006. Management of cottonwood leaf beetle (Coleoptera: Chrysomelidae) with a novel transplant soak and biorational insecticides to conserve coccinellid beetles. J. Econ. Entomol. 99(1): 102-108.
Smith, S. F. and V. A. Krischik. 2000. Effects of biorational pesticides on four coccinellid species (Coleoptera: Coccinellidae) having potential as biological control agents in interiorscapes. J. Econ. Entomol. 93(3): 732-736.
Findlay, S, M Carreiro, VA Krischik, and CG Jones. 1996. Leaf damage affects leaf litter quality. Ecological Applications 6(1): 269-275.
Website on tree insects
Website on turf insects
Website on beneficial insects
Select Extension Publications
Krischik, Vera A. and E. Tenczar. 2014. Pollinator conservation bulletin.
Krischik, Vera A. 2014. Insecticides used in greenhouse and landscapes and toxicity to pollinators bulletin
Krischik, Vera A. and E. Tenczar. 2014. Save the Bees poster (2.5 M PDF)
Krischik, Vera. 2013. Butterfly Gardening
Krischik Vera and Doree Maser. 2011. UM MDA Japanese Beetle Management in Minnesota
Krischik Vera, Catherine C. Reed, and Serena E. Willey 2005. Native Plants for Sustainable Landscapes
Krischik Vera and Kathryn J. Bevacqua. 2005. Sustainability in Urban Ecosystems
Krischik Vera and Jeffrey D. Hahn. 2003. Insecticide Suggestions to Manage Landscape Tree and Shrub Insects
Krischik Vera and Mark E. Ascerno. 2000. Managing Lawn and Turf Insects
Hahn Jeff, Vera A. Krischik, and Steven J. Seybold. 2000. Forest Tent Caterpillars in Minnesota
Kyhl John, Mary H. Meyer, and Vera A. Krischik 1998. Establishing and Maintaining a Prairie Garden
Wawrzynski Robert, Vera A. Krischik, and Steve Katovich. 1997. The Bronze Birch Borer and Its Management
Krischik Vera, Kathryn J. Bevacqua, and Anne Hanchek. 1997. Selecting Hardy Roses for Northern Climates
Stroom Kevin, Jody Fetzer, and Vera A. Krischik. 1997. Insect Pests of Roses
Vera A. Krischik, Raymond M. Newman, and John F. Kyhl. 1997. Managing Aquatic Plants in Minnesota Lakes
Jameson Scholer, 2013
Mary Rogers, 2008
Emily Tenczar, 2007
Emory Matts, 2005
Scott Smith, 2000
Luis Martin, MAG 2005, co-advisor for research
Alyson Landmark, MAG 2000, co-advisor for research
Barb Gregerson, MAG 1999, co-advisor for research
Marcus Zbinden, MLS 1997, co-advisor for research
UROP undergraduate students
Tyler Obermoller, 2013
Rafael de los Rios Bolton, 2012
Emily Tenczar, 2005