A dual tank precision sprayer to overcome antagonism of mixing dicamba and clethodim for control of volunteer corn in soybean

The mixing of clethodim and dicamba in the same tank could lead to reduced grass weed control, suggesting antagonism. Recently commercialized precision dual tank sprayers can apply two herbicides simultaneously through different boom systems, which may reduce potential herbicide antagonism for effective grass weed control. The objective of this study was to evaluate the interaction of dicamba and clethodim applied through tank mixing or using the dual tank/boom system for control of glyphosate‐/glufosinate‐resistant volunteer corn ( Zea mays L.) in dicamba‐resistant soybean [ Glycine max (L.) Merr.]. Mixing clethodim at the two rates of 54 and 76 g active ingredient (ai) ha −1 with dicamba in the same tank resulted in 21% and 28% volunteer corn control, respectively, 28 days after application. Clethodim and dicamba applied in a dual tank/boom provided similar control (97%–99%) as clethodim applied alone. The dual tank application of clethodim at 76 g ai ha −1 and dicamba had a similar volunteer corn density and soybean yield to that of clethodim alone. The results suggest that the dual tank/boom system of a sprayer was helpful in reducing antagonism of mixing clethodim and dicamba in the same tank to control volunteer corn in dicamba‐resistant soybean.