Residues in the forage and in milk from cows grazing forage treated with esters of 2,4-D

Journal or Publishing Institution: Weeds

Study: http://www.jstor.org/discover/10.2307/4040954?uid=3739256&uid=2&uid=4&sid=21104930265223

Author(s): Klingman, D.L., Gordon, C.H., Yip, G., and Burchfield, H.P.

Article Type: Peer Reviewed Study

Record ID: 456

Abstract: Low-volatile and high-volatile esters of 2,4-dichloro-phenoxyacetic acid (2,4-D) were sprayed on separate pastures at about double the usual rate. Milk from cows grazing these pastures contained from 0.01 to 0.09 ppm 2,4-D during the first 2 days after spraying and lower amounts thereafter. Residues in milk from cows put into the pastures 4 days after spraying were below 0.01 ppm, the practical limit of precision of the method used. Residues of 2,4-D, in or on forage, declined rapidly during the experiment. Almost all the 2,4-D in or on forage was hydrolyzed to the acid form in samples of forage taken within one-half hour after spraying with the butyl ester of 2,4-D, and about 75% after applying the 2-ethylhexyl ester.

Keywords: Esters, Pastures, Spraying, Forage, Milk, Milking, Chemical analysis, Vegetation, 2,4-D, 2,4-dichloro-phenoxyacetic acid

Citation: Klingman, D.L., Gordon, C.H., Yip, G., and Burchfield, H.P., 1966. Residues in the forage and in milk from cows grazing forage treated with esters of 2, 4-D. Weeds, 14(2), 164-167.