According to BioCycle the United States Environmental Protection Agency (U.S. EPA) sent a letter to DuPont August 11, 2011, ordering the company “to immediately halt the sale, use or distribution of Imprelis®, an herbicide marketed to control weeds that has been reported to be harming a large number of trees.”
As such, DuPont is implementing a “voluntary” suspension of sale of Imprelis® herbicide, and will soon be conducting a product return and refund program for the product.
The New York Times reported on July 14, 2011, that the new Dupont herbicide Imprelis® is suspected in the deaths of thousands of Norway spruces, eastern white pines and other trees on lawns and golf courses across the country.
On May 25, 2011, the U.S. Composting Council (USCC) began warning composters to watch out for grass clippings contaminated with a new herbicide from DuPont – Imprelis®.
Somewhat ironically; Dupont states in their FAQ that when disposing a tree damaged by Imprelis® “do not chip the tree for use in mulch or compost.”