CORRECTED-UPDATE 2-EPA asks court to withdraw registration of Dow herbicide

Wed Nov 25, 2015 4:44pm EST
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(Corrects headline and lead to clarify EPA action)

By Karl Plume

CHICAGO Nov 25 (Reuters) - The U.S. Environmental Protection Agency (EPA) is seeking court approval to withdraw registration of Dow Chemical Co's new herbicide Enlist Duo, as the agency studies new information regarding the product's impact on non-target plants, according to court documents filed late Tuesday.

The EPA approved the herbicide for sale and use in several U.S. states more than a year ago, but later found that its assessment of the product's two active ingredients was incomplete.

Enlist Duo, developed by Dow Chemical's Dow AgroSciences unit, is among a group of next generation herbicides designed to combat weeds resistant to glyphosate, a widely used herbicide in the United States and the active ingredient of Monsanto Co's Roundup.

Enlist Duo, which combines an herbicide component known as 2,4-D with glyphosate, is meant for use on corn and soybeans that have been genetically altered to tolerate it while killing surrounding weeds that can drag down crop yields.

The EPA said it discovered claims by Dow AgroSciences - the registrant of Enlist Duo - in its patent filings that the two active ingredients work better in combination, according to a court filing seen by Reuters. The EPA's study had assumed the components did not have such "synergistic effects."

"The information suggests that EPA's analysis may have understated the phytotoxicity of the product, therefore EPA can no longer be confident that Enlist Duo will not cause risks of concern to non-target organisms, including those listed as endangered," the court filing said.

Dow Chemical said it was working with the EPA to provide further assurances for Enlist and it expects a "prompt resolution of all outstanding issues."   Continued...