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Residues in the Forage and in Milk from Cows Grazing Forage Treated with Esters of 2,4-D

  • Dayton L. Klingman (a1), Chester H. Gordon (a2), George Yip (a3) and H. P. Burchfield (a4)

Abstract

Low-volatile and high-volatile esters of 2,4-dichlorophenoxyacetic 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.

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Residues in the Forage and in Milk from Cows Grazing Forage Treated with Esters of 2,4-D

  • Dayton L. Klingman (a1), Chester H. Gordon (a2), George Yip (a3) and H. P. Burchfield (a4)

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