By: Allan J. Cessna, James H. Hunter
In a 2-yr study, residues of 2,4-D and dicamba were monitored in wheat at several times over a complete growing season following g ha postemergence application as a tank mixture at 420 and 140-1, respectively. Both herbicides were gas chromatographically analyzed as their respective methyl esters using electrolytic conductivity detection. Initial wk after residues immediately after application decreased rapidly and, at 5–6 mg kg application, residues of both herbicides were less than 0.1-1. Residues of 2,4-D were not detectable in the straw or seed at maturity in either mg kg year. However, residues of dicamba in the order of 0.03–0.04-1 were detected both years in the mature straw. Residues of dicamba were not detected in the seed in the first year of the study, but were detected at mg kg0.014;±0.065-1 the second year.
In a 2-yr study, residues of 2,4-D and dicamba were monitored in wheat at several times over a complete growing season following g ha postemergence application as a tank mixture at 420 and 140-1, respectively. Both herbicides were gas chromatographically analyzed as their respective methyl esters using electrolytic conductivity detection. Initial wk after residues immediately after application decreased rapidly and, at 5–6 mg kg application, residues of both herbicides were less than 0.1-1. Residues of 2,4-D were not detectable in the straw or seed at maturity in either mg kg year. However, residues of dicamba in the order of 0.03–0.04-1 were detected both years in the mature straw. Residues of dicamba were not detected in the seed in the first year of the study, but were detected at mg kg0.014;±0.065-1 the second year.
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