Abstract
Dimetilan® (3-methyl-5-pyrazolyl dimethylcarbamate) incorporated in sugar baits was effective against organophos-phorus-resistant house flies (Musca domestica L.) in laboratory tests. In field tests in dairy barns in central Florida, against flies known to be resistant to certain organophosphorus insecticides, 1% Dimetilan baits gave effective control in one of two tests. Ribbons impregnated with a sweet syrup and Dimetilan, and cords impregnated with a mixture of parathion and Diazinon® ( O,O -diethyl O -(2-isopropyl-4-methyl-6-pyrimidinyl) phosphorothioate) gave practical control of house flies in hog parlors at Stoneville, Miss., but not in barns and/or poultry houses at Lincoln, Nebr., Kerrville, Tex., and Orlando , Fla. Piperonyl butoxide gave 2 ½-fold synergism with Dimetilan at a ratio of 10: 1 in contact sprays.
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