Many producers may be in a position where they must unexpectedly change from a preemergence-based program for grass control in corn to a postemergence program due to the recent rains. Several products are available that provide effective control of emerged grasses in these situations. These products are based on the sulfonylurea herbicides nicosulfuron and rimsulfuron (Table 1). Nicosulfuron, the lone active ingredient in Accent, has little residual activity but has more foliar activity than rimsulfuron. Rimsulfuron has less foliar activity than nicosulfuron, but provides better residual control.