There are questions regarding the value of tank mixing an insecticide for soybean aphids with the application of glyphosate for weed control in glyphosate-resistant soybeans. This seems like a logical approach to reduce cost, however it is probably impractical because of timing and application issues. The optimum timing for soybean aphids has historically been between mid- or late July and early August; the optimum timing for glyphosate in soybean is when the weeds are less than 4-inches tall which is most likely to be in June.
Iowa State University
Rice, Marlin E., "Soybean aphid insecticide and herbicide tank mixing" (2004). Integrated Crop Management News. 1588.
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