The agency’s decision could delay the introduction of corn, soybeans and cotton developed by Dow Chemical to be resistant to the herbicide 2,4-D. But Dow said it did not anticipate a significant delay.
In a court filing on Tuesday, the E.P.A. said it had discovered new information suggesting that the herbicide, which Dow calls Enlist Duo, could be more toxic than previously believed.
“E.P.A. can no longer be confident that Enlist Duo will not cause risks of concern to nontarget organisms, including those listed as endangered, when used according to the approved label,” the agency said in its filing to the United States Court of Appeals for the Ninth Circuit in San Francisco.
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