Field studies conducted at six locations in Georgia and one location in Virginia evaluated imazethapyr and imazethapyr mixtures for weed control, crop tolerance, and peanut yield. Imazethapyr applied early postemergence controlled bristly starbur, coffee senna, common cocklebur, Ipomoea species, jimsonweed, prickly sida, and smallflower morningglory at least 91% and controlled yellow and purple nutsedge 88 and 98%, respectively. Paraquat plus bentazon applied early postemergence did not control the aforementioned weeds as well as imazethapyr or imazethapyr mixtures. Paraquat applied with imazethapyr reduced bristly starbur control 15% compared to imazethapyr alone but did not influence control of the other species. Imazethapyr control of bristly starbur was not improved by the addition of bentazon. Sicklepod control was less than 24% with imazethapyr and was at least 58% with imazethapyr plus paraquat. Imazethapyr thus bentazon at three of the four locations evaluated. Imazethapyr did not control Florida beggarweed, while imazethapyr plus paraquat controlled at least 53%. Peanut injury was minimal 30 d after application for all treatments. Nomenclature: Bentazon, 3-(1-methylethyl)-(1H)-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxide; chlorimuron, 2-[[[(4-chloro-6-methoxy-2 pyrimidinyl)amino]carbonyl]amino]sulfonyl]benzoic acid; imazethapyr, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acid; paraquat, 1,1'dimethyl-4,4'-bipyridinium ion; pendimethalin, N-(1-ethylpropyl)-3,4-dimethyl-2,6-dinitrobenzamine; 2,4-DB, (2,4-dichlorophenoxy)butanoic acid; bristly starbur, Acanthospermum hispidum DC. #3 ACNHI; coffee senna, Cassia occidentalis L. # CASOC, common cocklebur, Xanthium strumarium L. # XANST; Florida beggarweed, Desmodium tortuosum (Sw.) DC. # DEDTO; jimsonweed, Datura stramonium L. # DATST; prickly sida, Sida spinosa L. # SIDSP; purple nutsedge, Cyperus rotundus L. # CYPRO; sicklepod, Cassia obtusifolia L. # CASOB; smallflower morningglory, Jacquemontia tamnifolia (L.) Griseb. # IAQTA; yellow nutsedge, Cyperus esculentus L. # CYPES; peanut, Arachis hypogaea L. 'Florunner,' 'Southern Runner,' 'NC 7.'
