Herbicide injury in special crops from sprayer tank residues

Non-Peer ReviewedBroad-leaved special crops have long been known to be sensitive to phenoxy herbicides. Field trials were conducted on sunflowers, lentils and mustard. Simulated sprayer tank residues of 2, 1, 0.5, and 0.25 % of the field rate of the broad-leaved weed herbicides were applied alone and with diclofop-methyl and sethoxydim as they would be with the subsequent use of the sprayer in the special crops. The grassy weed herbicides enhanced the effect of 2,4-D, MCPA and dicamba in sunflowers and of clopyralid in lentils while the effect of chlorsulfuron alone in mustard equaled that of the grassy weed herbicide mixtures. Yields losses occurred in all three special crops from the simulated residues of herbicides used in cereal crops. losses ranged from 0 to 92 % depending on the herbicide combination, rate applied, and crop tested