A commonly used neonicotinoid pesticide may harm monarch butterflies, University of Guelph research has revealed. The findings could help explain the recent massive decline in the North American monarch population. Led by U of G integrative biologist Dr. Ryan Norris, two studies examined effects on monarch caterpillars raised on milkweed treated with the insecticide clothianidin,
Neonic-treated milkweed an ‘ecological trap’ for monarchs
