POSTEMERGENCE BROADLEAF WEED-CONTROL IN CORN (ZEA-MAYS) WITH CGA-152005

Field studies were conducted in 1993 and 1994 to evaluate broadleaf we ed control in corn with the sulfonylurea herbicide CGA-152005. CGA-152 005 was applied at 10 to 50 g ai/ha alone and in combination with 2,4- D, dicamba, or atrazine. No corn injury was observed either year. Meto lachlor plus CGA-152005 controlled redroot pigweed, velvetleaf, and co mmon cocklebur 95% or more in 1993 and 1994. Common lambsquarters and ivyleaf morningglory control was dependent on CGA-152005 rate, weed si ze at application, and growing conditions. In 1994, control of velvetl eaf and ivyleaf morningglory with CGA-152005 at 10 or 20 g/ha was less when applied as a tank-mix with atrazine and dicamba compared with wh en it was applied alone, probably due to antagonism caused by the comp anion herbicide. Generally, corn yield was related to weed control.