イエバエ成虫に対する合成ピレスロイド系薬物シフルトリンの殺虫効果

Abstract

A synthetic pyrethroid, cyfluthrin, was evaluated for its insecticidal effect on adult house flies, Musca domestica. The house flies used were of the susceptible Takatsuki strain, pyrethroid and organophosphateresistant Kyushu and Komagane strains, and organophosphate-resistant Yumenoshima-87 strain. Thrity female flies, 3-5 days old, of each strain were respectively put in 10 trapezoid-hexahedral cages, made of cardboard, measuring 30cm × 30cm in the upper open area covered with stainless mesh, 19cm × 19cm in the bottom area, and 8cm in depth. One cage was assigned as a non-treated control, and another was sprayed with tap water in a volume of 50ml/m2. Four cages were sprayed with 125-, 250-, 500-, and 1000-fold dilutions of cyfluthrin 5%(W/W) emulsion at a rate of 50ml/m2. To the other 4 cages, 100-, 200-, 400-, and 800-fold dilutions of a mixture (at a ratio of 1: 5 calculated as active ingredients) of cyfluthrin 5% emulsion and piperonyl butoxide as a synergist were sprayed at a rate of 50ml/m2. These 4 dilutions were equivalent to those of the 125-, 250-, 500-, and 1000-fold dilutions of the 5% emulsion. As a result, cyfluthrin had a nearly 100% efficacy against Takatsuki and Yumenoshima-87 strains of house flies, when used both singly or mixed with piperonyl butoxide. On the other hand, for pyrethroid-resistant Kyushu and Komagane strains, cyfluthrin was less effective when applied singly, but it showed a high knock down and low revival rates on flies when mixed with piperonyl butoxide.