Weed Control Programs in Peanut (Arachis hypogaea) with Diclosulam and Ethalfluralin Combinations

Abstract

Field studies were conducted during the 1998 and 1999 growing seasons to evaluate diclosulam (Strongarm) alone and in combination with ethalfluralin (Sonalan) for devil’s-claw, Palmer amaranth, pitted morningglory, Texas panicum, and yellow nutsedge control.  Diclosulam alone applied preplant incorporated, preemergence, or postemergence controlled Palmer amaranth and pitted morningglory greater than 81%, devil’s-claw at least 80%, Texas panicum 33 to 97%, and yellow nutsedge 48 to 88% four weeks after treatment (WAT).  When ethalfluralin was applied in combination with diclosulam, early-season (4 WAT) Palmer amaranth was controlled at least 97%, devil’s-claw was controlled at least 87%, pitted morningglory was controlled greater than 90%, Texas panicum was controlled greater than 80%, and yellow nutsedge control was at least 72%.  When rated 14 WAT, ethalfluralin applied in combination with or followed by diclosulam controlled Palmer amaranth and pitted morningglory at least 87%, devil’s-claw 100%, and yellow  nutsedge at least 86%. Diclosulam alone controlled no greater than 79% yellow nutsedge regardless of rate or application method.  Texas panicum control (14 WAT) with ethalfluralin in combination with or followed by diclosulam or diclosulam alone was less than 90% regardless of rate or application method.