Susceptible Crop Response to Soil Residues and Foliar Exposure of Dicamba

Dry bean, soybean, sugarbeet, and sunflower were tested for tolerance to dicamba residue in soil. Visible injury was seen on dry bean and soybean depending on location, but yield differences were not present. Increasing rates of glyphosate and dicamba caused injury to dry edible bean; however, final bean weight only differed from the nontreated when 18 g ha-1 dicamba was included. Dicamba applied at 1.8 g ha-1 caused a consistent delay in physiological maturity. Dicamba concentration in plants did not predict yield loss. Across the four market classes in the field, dicamba caused yield loss, but glyphosate did not. Effects of the herbicide on yield was the same in each market class.Monsanto and Northarvest Bean Grower