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Variations of Pesticide Residues in Arizona Milk^{1, 2,}

Departments of Entomology, Agricultural Economics, and Dairy Science respectively, University of Arizona, Tucson

F. M. Whiting

United Dairymen of Arizona, Tempe

ABSTRACT

Information concerning the extent and nature of pesticide residue contamination in milk, produced under Arizona conditions, was obtained in a survey conducted over a period of four years and three months. The residue level exhibited a seasonal cycle, with a maximum in the fall and a minimum in the late spring or early summer. This cyclic pattern could be correlated with practices in pesticide application and the harvesting, storage, and feeding of drift-contaminated forage. Educational and regulatory efforts gave response in reduced insecticide contamination, with the latter apparently being more effective.

DDT and its metabolites DDE and DDD were the major compounds found. The metabolite DDE occurred in concentrations 6 to 12 times higher than DDT.

¹ Arizona Agricultural Experiment. Station Technical Paper no. 1103.

² This work was supported in part by a grant from the United Dairymen of Arizona.