PREEMERGENCE BROADLEAF WEED-CONTROL AND CROP TOLERANCE IN IMIDAZOLINONE-RESISTANT AND IMIDAZOLINONE-SUSCEPTIBLE CORN (ZEA-MAYS)

Field studies were conducted in 1994 and 1995 at Dekalb and Urbana, IL , to evaluate preemergence broadleaf weed control and crop tolerance i n imidazolinone resistant (IR) and susceptible (non-IRI) corn using at razine, imazethapyr, AC 263,222, CGA-152005, MON 12000 with and withou t MON 13900 (a safener), and flumetsulam + clopyralid. When sufficient rainfall occurred within 28 d of application to insure herbicide abso rption, the IR corn variety was more tolerant than the susceptible var iety to imazethapyr, AC 263,222, CGA-152005 at 40 and 80 g/ha, and MON 12000 with and without MON 13900. Overall crop tolerance of IR corn w as equal to that of corn treated with atrazine for all herbicide treat ments except CGA-152005, which injured IR corn. Control of velvetleaf, common lambsquarters, Pennsylvania smartweed, tall morningglory, and jimsonweed for all herbicide treatments was equal or superior to that of atrazine at 1.7 kg/ha. However, control of common cocklebur was sig nificantly greater with atrazine compared to imazethapyr and the low r ate of CGA-152005.