The spread of multiple herbicide resistant weeds brought an end to the era of total postemergence programs in soybean. Unfortunately, a prolonged rainy period prevented applications of preemergence treatments on many planted soybean fields in certain areas of the state. By the time fields are fit for field operations soybeans likely will be emerging and limit herbicide options in those fields. Without careful management and a bit of good fortune, this situation will make it difficult to stay ahead of the weeds for the remainder of the season. Controlling emerged weeds and applying an effective residual herbicide in these fields should be a top priority moving forward.
Iowa State University
Hartzler, Bob, "Preemergence Herbicide Options for Planted Soybean Fields" (2017). Integrated Crop Management News. 2424.
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