Weed management in peanut (Arachis hypogaea) with flumioxazin preemergence

Flumioxazin plus metolachlor mixtures preemergence (PRE) were evaluated wit h or without postemergence (POST) herbicides for weed control and peanut (A rachis hypogaea) response in three North Carolina studies. Metolachlor PRE at 2.24 kg ai/ha controlled goosegrass (Eleusine indica) and yellow nutsedg e (Cyperus esculentus) 93 and 80%, respectively, and control was not improv ed with flumioxazin or norflurazon. Metolachlor plus flumioxazin PRE at 0.0 7 or 0.11 kg ai/ha controlled common lambsquarters (Chenopodium album); ent ireleaf (Ipomoea hederacea vat: integriuscula), ivyleaf (I. hederacea), and pitted morningglory (I. lacunosa); and prickly sida (Sida spinosa) better than metolachlor plus norflurazon PRE at 1.34 kg ai/ha. Morningglories (Ipo moea spp,) were controlled 77 and 86% with flumioxazin PRE at 0.07 and 0.11 kg/ha, respectively, and control was increased to nearly 100% with acifluo rfen plus 2,4-DB or lactofen plus 2,4-DB POST. Peanut injury by flumioxazin and norflurazon was observed atone location in 1997; however, yields were not reduced. Peanut treated with metolachlor plus flumioxazin PRE at either rate yielded at least 3,750 kg/ha compared to 3,120 kg/ha with metolachlor plus norflurazon PRE or 1,320 kg/ha with metolachlor PRE.