Fly Control in Dairy Barns Sprayed with Dimethoate and the Determination of Dimethoate Residues in Milk 1

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Abstract
During the summer of 1959, dairy barns and loafing pens were sprayed with 0.5% and 1% dimethoate (0,0, dimethyl S-N- methylcarbamoylmethyl) phosphorodithioate) in water emulsion. The sprays gave excellent control of the horn fly (Haematobia irritans (L.)) and the house fly (Muscadomestica (L.)), their residual effect lasting from 5 to 9 weeks. The stable fly (Stomoxys calcitrans (L.)) appeared in the barns for a brief period during which it was effectively checked by the sprays. Analysis of milk samples collected during June, July, August, and September showed no detectable amounts of dimethoate residues.

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