DETROIT – Arguments will be heard Sept. 20 on a motion to require DuPont to notify property owners and lawn care professionals who bought the now banned- herbicide Imprelis of the steps necessary to preserve evidence of tree damage, a federal judge ordered Tuesday.

The order to hear the motion for a preliminary injunction follows a letter that DuPont sent to lawn care professionals and golf course superintendents Friday. Michael McDermott, global business leader for DuPont Professional Products, said in the letter that the company would be emailing details about the claims process Tuesday.

McDermott directed letter recipients to submit "information about any possible Imprelis-related damage on your or your customers' properties."

The chemical giant, based in Wilmington, Del., stopped selling Imprelis earlier this month after acknowledging that the herbicide caused certain species of trees, including the white pine, to curl and brown, and in many cases, die.

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