Are farmers seeding trouble in their fields?

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Farmers use insecticides on many crops. Often they’re sprayed, either from vehicles driven through fields or by workers with tanks on their backs and applicator nozzles. But over the past decade, a new technique has entered wide use: pre-coating seeds with pesticides, ready to plant.

This approach may seem targeted, but as Penn State University entomologist John Tooker explains, it’s delivering large quantities of pesticides onto fields, and plants only take up a small fraction. Many scientists and conservation groups argue that the unused portion is harming bees and other beneficial insects, and may threaten mammals and birds. Tooker reviews the latest research and makes a case for relying more on integrated pest management, an approach that minimizes use of agricultural chemicals.

Also today:

Jennifer Weeks

Senior Environment + Energy Editor

Planting corn near Dwight, Ill., April 23, 2020. Virtually all corn seeds planted in the U.S. are coated with neonicotinoid insecticides. Scott Olson/Getty Images

Farmers are overusing insecticide-coated seeds, with mounting harmful effects on nature

John F. Tooker, Penn State

Studies suggest that seeds coated with neonicotinoid insecticides may harm nontarget insects, mammals and birds. In response, states are starting to restrict use of these products.

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