Illinois Soybeans: Layering Soil-Residual Herbicides

Photo: Liz Stahl, University of Minnesota

Photo: Liz Stahl, University of Minnesota

Applying soil-residual herbicides with non-residual, foliar-applied herbicides can help reduce additional weed emergence following application and, therefore, reduce the need for another application later.

The “lateness” of this year’s soybean crop undoubtedly will decrease the number of acres where layered residuals are applied, but nonetheless keep in mind that labels for most soil-residual herbicides used in foliar applications include soybean growth stages or time intervals beyond which applications cannot be made. Additionally, these labels include time intervals for rotational crops, such as wheat.

A partial listing of soil-residual herbicides sometimes applied postemergence in soybean is presented in Table 1. Be sure to consult the label of any product used to determine maximum crop growth stage and rotational crop intervals.

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