Abstract
A cooperative study was made by the U. S. Department of Agriculture and Geigy Agricultural Chemicals to determine the residues of diazinon in the fat of cattle after repeated spray applications. Hereford cattle were sprayed 16 times, at weekly intervals, with 0.1 or 0.05% suspensions of the insecticide and samples of omental fat were taken by omentectomy and analyzed for residues. The fat from cattle sprayed at each rate contained small amounts of diazinon 1 and 7 days after the last spraying but none was present after a postspray interval of 14 days.
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