Clyphosate-resistant weeds, especially Palmer amaranth, have soybean growers in the South once again pondering their early season weed control options. Before the introduction of Roundup Ready soybeans, weed control in soybeans began with the selection of a residual herbicide that best fit the grower's needs. At that time, total postemerge weed control in soybeans was possible, but much more difficult than a two-pass Roundup system later would become. Residuals all but went the way of the dinosaurs during the 2000s. The occurrence of glyphosate-resistant weeds, especially Palmer amaranth or Palmer pigweed, has switched that focus back on early season options. The need to start clean and stay clean has never been greater.
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