Chlorimuron-ethyl is a highly effective postemergence herbicide for control of economically important broadleaf weeds in soybean. It has been developed by E. I. du Pont de Nemours & Co., Wilmington, DE, under the code DPX-F6025 and is marketed in the United States under the trade name of Classic. Chlorimuron-ethyl is a member of a new class of herbicides called sulfonylureas. It is active at extremely low use rates, and soybeans have good tolerance.