Abstract
Field studies were conducted from 1995 to 1997 to evaluate the potential for sethoxydim to control woolly cupgrass [Eriochloa villosa (Thunb.] Kunth.] in sethoxydim-resistant (SR) corn (Zea mays L.) and to identify potential interactions among sethoxydim and selected broadleaf herbicides. A single preemergence (PRE) application of acetochlor did not provide adequate season-long control of woolly cupgrass at 60 d after the postemergence (POST) timing. Sequential applications of acetochlor followed by sethoxydim or nicosulfuron improved woolly cupgrass control and plant density reduction. Sethoxydim controlled woolly cupgrass equal to or greater than acetochlor or nicosulfuron in all years. Split POST applications of sethoxydim provided 87% or greater woolly cupgrass control and 93% or greater plant density reduction. Dicamba, atrazine plus dicamba, bromoxynil, or halosulfuron did not reduce woolly cupgrass control by sethoxydim. However, atrazine plus bentazon and primisulfuron plus prosulfuron reduced woolly cupgrass control by sethoxydim resulting in greater plant densities compared with sethoxydim applied alone. These studies suggest that sethoxydim can be used as an effective tool in SR corn for control of woolly cupgrass.
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