Response of Edamame Soybean Variety AVS 4002 to Herbicides

Abstract

Core Ideas Pyroxasulfone and linuron are acceptable preemergence herbicide options for edamame.Acifluorfen and fomesafen are potential postemergence herbicides.Edamame generally compensates for stand loss from residual herbicides. Edamame (Glycine max L. Merr.) is a vegetable soybean whose consumption is expected to rise in the United States. Although only a few herbicides are currently registered for use in edamame, weeds are a major constraint of this crop. Field experiments were conducted in 2013 and 2014 in Kibler, AR, to evaluate the response of edamame cultivar AVS 4002 to 24 herbicide treatments and their efficacy on prominent crop weeds. Three of the treatments were applied 7 d preplant (PPL), 15 were applied preemergence (PRE), and 6 treatments were applied postemergence (POST). In 2013, fomesafen (0.42 kg ha−1), S‐metolachlor+fomesafen premix (1.39 kg ha−1), linuron (0.84 and 1.68 kg ha−1), pyroxasulfone (PRE) (0.14 kg ha−1), did not affect the stand of edamame. In 2014, all but two soil‐applied treatments, fomesafen and sulfentrazone+carfentrazone, reduced the stand by 24 to 50%. However, yield loss occurred with metribuzin (0.56 kg ha−1; PRE), and sulfentrazone (0.21 and 0.42 kg ha−1; PRE) applied alone or in tank mixture in 2013, and the high rate of sulfentrazone in 2014. Pyroxasulfone and linuron are acceptable PRE herbicide options for edamame. The premixes of flumioxazin+chlorimuron or saflufenacil+dimethenamid‐P applied PPL provided excellent weed control (>89%) at 35 d after planting (DAP). Among the POST treatments (foliar applied), acifluorfen, and fomesafen were the best options for Palmer amaranth (Amaranthus palmeri S. Watson) control, which provided at least 95 and 93% control, respectively, at 35 DAP. None of the foliar‐applied (POST) herbicides caused yield loss.