WEED-CONTROL AND PEANUT (ARACHIS-HYPOGAEA) RESPONSE TO NICOSULFURON AND BENTAZON ALONE AND IN MIXTURE

Field studies in 1990 and 1998 evaluated treatment timings of nicosulf uron and bentazon alone and in mixture for weed control, peanut injury , and yield. The experimental areas were treated with a broadcast PPI application of benefin at 1.68 kg ai ha(-l). Nicosulfuron was applied at 40 g al ha(-1) and bentazon at 560 g ai ha(-)1. Nicosulfuron mixed with bentazon applied 1 wk after crop emergence (WAF) controlled yello w nutsedge 81%. Bentazon or bentazon plus nicosulfuron applied 1 or 3 WAE controlled smallflower morningglory at least 94%. Nicosulfuron con trolled sicklepod at least 76% in 1990. However, control of sicklepod was 71% from 1 WAE nicosulfuron application in 1991 and less than 26% for 3, 5, or 7 WAE application. Bentazon controlled Ipomoea spp. at le ast 70% but did not control Florida beggarweed and sicklepod. Nicosulf uron alone controlled Florida beggarweed and Ipomoea spp. Nicosulfuron reduced early-season peanut growth, but peanut recovered by mid-Augus t. Bentazon reduced nicosulfuron control of Florida beggarweed when ap plied 1, 3, or 5 WAE, but not 7 WAE. Bentazon mixed with nicosulfuron applied 3 WAE in 1990 reduced weed-free peanut yields compared to nico sulfuron alone. Nicosulfuron and bentazon did not significantly reduce peanut yields under weed-free conditions in 1991.