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Bt Corn Risk to Monarchs Is 'Negligible'

A much-anticipated report from a consortium of U.S. and Canadian scientists states that the most commonly planted forms of genetically engineered Bt corn pose only a "negligible" risk to monarch butterfly populations.

These types of corn make their own pesticides, nicknamed Bt in honor of the Bacillus thuringiensis bacterium that supplied the toxin's gene. The pesticide rides within corn pollen as it drifts on the wind, sometimes settling on the milkweed plants that monarch caterpillars eat.

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