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Imprelis and Investigation of Damage to Trees

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June 2012

In the summer of 2011, the Environmental Protection Agency received reports from numerous states that E. I. du Pont de Nemours and Company's (DuPont) herbicide, Imprelis, which contains the active ingredient aminocyclopyrachlor, may have caused injury to certain species of evergreen trees, particularly Norway spruce and white pine.

Imprelis is no longer on the market because the EPA issued a stop sale order in August 2011: Letter to DuPont on Stop Sale, Use, or Removal Order (PDF) (9 pp, 164k, About PDF). The agency is conducting an independent evaluation and has required the company to expedite submission to the EPA of detailed information related to the situation to determine what caused the injuries.

Imprelis and EPA Registration

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