EPA proposes to cancel tolerances for chlorpyrifos insecticide

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The Environmental Protection Agency is accepting comments through Jan. 5, 2016, on whether to revoke all tolerances for chlorpyrifos, a broad-spectrum insecticide marketed as Lorsban and a handful of other brands.

Chlorpyrifos, a restricted-use pesticide, is labeled to control insect pests on soybeans, corn, cotton, wheat, sugar beets, legume vegetables and Christmas trees, among other other crops. Dow AgroSciencies received the first registration for the active ingredient in 1965 and has since marketed it to agriculture as Lorsban.

Other companies have since received registrations for chlorpyrifos under brands, such as Eraser, Whirlwind Saurus, Stallion, Nufos, Bolton, Warhawk and Vulcan.

The EPA’s actions are in response to a decision by the U.S. Court of Appeals for the Ninth Circuit in San Francisco, which ordered the agency to respond to an administrative petition to revoke all tolerances.

The petition was originally filed by the Natural Resources Defense Council and PANNA—Pesticide Action Network North America. They questioned the EPA’s new methodologies for evaluating the pesticide that went into the reregistration process and particularly the dietary exposure and drinking water assessments.

Read the full Federal Register notice.

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