Abstract

Field studies were conducted during 2003 and 2004 in the south Texas peanut (Arachis hypogaea) growing region to evaluate herbicides for effective weed control under a strip-tillage production system. Ethalfluralin (Sonalan) plus diclosulam (Strongarm) applied preemergence provided the most consistent control of southern crabgrass, Texas panicum, and yellow nutsedge (> 94%). Ethalfluralin at 2.0 pt/acre plus flumioxazin (Valor) at 3.0 oz/acre applied preemergence controlled southern crabgrass and Texas panicum 75 to 84% while ethalfluralin plus flumioxazin at 2.0 oz/acre controlled those same annual grasses 56 to 76%. Ethalfluralin followed by imazethapyr (Pursuit) or imazapic (Cadre) controlled yellow nutsedge and Texas panicum at least 98% but controlled southern crabgrass only 60 to 78%. Ethalfluralin applied preemergece followed by imazapic or diclosulam applied postemergence provided the highest yields (> 3900 lbs/acre) and net returns.

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