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AbstractTwo dinitroaniline herbicides, Prowl and Treflan, were tested in field experiments with cotton to determine their differences, if any, in terms of weed control and crop injury potential. Plots treated with the lowest rate of Treflan (0.125 lb a.i./A at one location and 0.25 lb a.i./A at a second location) exhibited reduced weed control in comparison to the other herbicide treatments. Although root inhibition was slight, lateral root growth of cotton was inhibited more by the higher rates of Treflan (0.75 and 1.0 lb a.i./A) than by the higher rates of Prowl (1.0 and 1.25 lb a.i./A). However, differences in weed control and crop injury were not reflected in differences in cotton stand counts, height measurements and yield as there were no significant differences in these parameters between treatments.