Weed Management in Peanut (Arachis hypogaea) with Flumioxazin Preemergence

Flumioxazin plus metolachlor mixtures preemergence (PRE) were evaluated with or without postemergence (POST) herbicides for weed control and peanut ( Arachis hypogaea ) response in three North Carolina studies. Metolachlor PRE at 2.24 kg ai/ha controlled goosegrass ( Eleusine indica ) and yellow nutsedge ( Cyperus esculentus ) 93 and 80%, respectively, and control was not improved with flumioxazin or norflurazon. Metolachlor plus flumioxazin PRE at 0.07 or 0.11 kg ai/ha controlled common lambsquarters ( Chenopodium album ); entireleaf ( Ipomoea hederacea var. 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 ( Ipomoea 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 acifluorfen plus 2,4-DB or lactofen plus 2,4-DB POST. Peanut injury by flumioxazin and norflurazon was observed at one 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.