Soil Water Content Affects the Activity of Four Herbicides on Green Foxtail (Setaria viridis)

Low soil water content for 10 to 14 days before and 7 days after herbicide application reduced control of green foxtail with fenoxaprop, fluazifop-P, haloxyfop, and sethoxydim. Withholding irrigation for 10 to 14 days before herbicide application did not reduce control of green foxtail with normal use rates of herbicides if plots were irrigated at the time of application. Low soil water content reduced the activity of sethoxydim less than the other herbicides.