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Dry Weather Affects Herbicides
Dry conditions reduce the weed control from soil-applied herbicides. A herbicide applied to the soil must move from the soil into the weeds as the weeds are growing through the treated zone of soil. If the herbicide is in dry soil, than herbicide is bound to the soil and is not available to kill the weeds.
Weeds may germinate in moist soil below the dry herbicide-treated zone and establish without being controlled. A late rainfall will often activate the herbicide and give good control of weeds germinating after the rain, but weeds that emerged before the rain often will not be controlled.
Herbicides that are incorporated generally give better weed control than surface-applied herbicides. Incorporation improves the chance that the herbicide will be in moist soil. Shallow incorporated herbicides are affected more by weather than deep incorporated herbicides.
Monitor fields and evaluate post emergence herbicide options.
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