Insecticides are biggest butterfly killers in Midwest, lowering wild diversity

Monarch on milkweed in U.P.

A monarch butterfly lands on a common milkweed plant on June 27, 2024, in a forestry plot owned by Aurora Sustainable Lands near Seney in Michigan's Upper Peninsula. (Sheri McWhirter | MLive.com)Sheri McWhirter

EAST LANSING, MI – Insecticide use is the largest factor contributing to a decline in butterfly abundance and species diversity across the Midwest.

A scientific study completed at Michigan State University concluded that shifts in insecticide use toward neonicotinoid-treated seeds are associated with an 8% decline in butterfly species diversity across the U.S. Midwest.

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