Early research links insecticide, monarch butterfly deaths

February 15, 2015

Vera KrischikNew, local research provides some of the first evidence that a popular group of insecticides might be killing young monarch butterflies. The milkweed plants the butterflies need to survive may also hold neonicotinoid from nearby plants, making the milkweed toxic to monarchs. University of Minnesota entomologist Vera Krischik fed butterflies milkweed plants treated with the amount of the insecticide Imidacloprid that might be found on backyard plants. Adult monarchs and painted lady butterflies were not affected. It appears the adults have the ability to detoxify, she said. Listen to the Story