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Phosmet residues in milk following treatment of dairy cows for warble-fly.

Persistence of the organophosphorus pesticide, phosmet, in the milk of 10 dairy cows was determined following treatment of the animals for warble-fly. The mean phosmet concentration in the milk was at a peak level (0.04 mg kg−1) 12 h after treatment. The extent of phosmet elimination in milk was related to the milk yield for each cow.