... Number of Herbicides Herbicide Resistance Observed 2,4-D Dalapon Atrazine Picloram Trifluralin Triallate Diclofop 9. 2.2 Year Deployed 194 5 195 3 195 8 196 3 196 3 196 4 198 0 195 4 196 2 196 8 198 8 198 8 198 7 ... activity of CYP enzymes that demethylate chlortoluron by oxidation and hydroxylate the methyl group in the ring (see Burnet et al., 199 3a, 199 3b, 199 4a, 199 4b; Maneechote et al., 199 4) 9. 3.2 Insensitive ... and Willmitzer, 198 9 Streber et al., 199 4 Andrews et al., 199 7 Shiota et al., 199 4; Inui et al., 2000 Chlorsulfuron 9. 3.5.1 Summary Herbicide-resistant crops to other inhibitors of amino acid biosynthesis...