NUTSEDGE (CYPERUS SPP) CONTROL IN PEANUT (ARACHIS-HYPOGAEA) WITH AC263,222 AND IMAZETHAPYR

Experiments were conducted from 1991 through 1993 to evaluate AC 263,2 22 and imazethapyr for yellow and purple nutsedge control in peanut. A C 263,222 at 0.05 to 0.07 kg/ha controlled purple nut sedge (88 to 99% late season) whether applied preplant incorporated (PPI), preemergenc e (PRE), early postemergence (EPOST) al peanut emergence, or pastemerg ence (POST), Yellow nutsedge control with AC 263,222 was inconsistent at the 0.04 kg/ha rate; however, the 0.05 and 0.07 rate gave 88% early season yellow nutsedge control, but late season control was variable. Yellow nutsedge control with soil-applied treatments of AC 263,222 an d imazethapyr were similar but AC 263,222 provided better postemergenc e control than did imazethapyr. Purple nutsedge control was similar fo r both herbicides across all application methods.