Abstract
Individual Dermanyssus gallinae were collected from 72 poultry farms in 20 prefectures, and the development of resistance by D. gallinae to commercial acaricides was studied. In this study, commercial acaricides that were used to target the control of D. gallinae (two kinds of carbamate, organophosphate and one kind of pyrethroid) and to target the control of flies (two kinds of pyrethroid, two kinds of a combination pyrethroid and organophosphate) were examined. The development of resistance by D. gallinae was observed for each acaricides, but carbamate acaricide, carbaryl, and a combination acaricide (fenitrothion, permethrin and phthalthrin) showed lower rates of the development of resistance compared to other acaricides. However, the development of resistance by D. gallinae to each of these three kinds of compound used to target its control could be confirmed in 12 poultry farms out of 72. The development of resistance differs by individual poultry farm, and this difference is considered to be related to the farm's history of chemical control methods.
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