New EPA Tolerances for Endothall Residues

The U.S. Environmental Protection Agency announced new regulation, effective December 18, 2009, of the allowable level of endothall residues in or on commodities.  By establishing tolerances for the level of endothall, the EPA has cleared the way for the use of such products in irrigation and livestock watering.

The new tolerances were requested by United Phosphorus, Inc. (“UPI”) who has announced the release two new products, Cascade and Teton, for use in irrigation canal treatments.  These products are designed to help control common pondweed, hydrilla and algae species found in irrigation systems.  UPI called this “the most significant improvement in products approved for control of submerged plants in irrigation canals in the past 40 years.”