瓜实蝇不同寄主种群对4种杀虫剂的敏感性

为探索瓜实蝇Zeugodacus cucurbitae不同寄主种群对杀虫剂的敏感性，本研究在室内通过药膜法测定了瓜实蝇节瓜、黄瓜、丝瓜和苦瓜种群4日龄成虫对4种杀虫剂的敏感性，随后将瓜实蝇不同寄主种群致死中浓度LC50进行比较，计算抗性倍数。结果表明，4个寄主种群对甲维盐的敏感性为节瓜 > 苦瓜 > 丝瓜 > 黄瓜，其中节瓜、苦瓜种群对甲维盐最敏感，其次是丝瓜、黄瓜，LC50值分别为0.250、0.391、0.809和1.035 mg/L。4个寄主种群对灭多威的敏感性表现为节瓜 > 黄瓜 > 苦瓜 > 丝瓜，LC50值分别为0.302、0.318、0.652和0.804 mg/L。对多杀菌素的敏感性大小依次为黄瓜、节瓜、丝瓜、苦瓜，LC50值分别为1.157、1.198、1.232和2.029 mg/L。对啶虫脒的敏感性为苦瓜 > 节瓜 > 黄瓜 > 丝瓜，LC50值分别为17.946、20.166、20.190和21.986 mg/L，其中对甲维盐的敏感性差异幅度最大，为4.140倍，其次是灭多威，为2.654倍，对啶虫脒的敏感性差异幅度最小，为1.225倍。表明寄主植物可引起瓜实蝇对杀虫剂的敏感性变化。

Sensitivity of different host populations of Zeugodacus cucurbitae to four insecticides

In order to explore the susceptibility of different host populations of the fruit fly to insecticides, in this sduty, the susceptibilities of the 4-day-old Zeugodacus cucurbitae adults from four host (Benincasa Hispida, Cucumis sativus, Luffa cylindrica, Momordica charantia) populations, to four insecticides were determined by the drug-film method in the laboratory. Then, the lethal concentration LC50 of different host populations of Z.cucurbitae was compared to calculate theresistance ratio. The results showed that the susceptibilities of the four host populations to emamectin benzoate were as in order of B. hispida, C. sativus, L. cylindrica and M. charantia, and with the LC50 values of 0.250, 0.391, 0.809 and 1.035 mg/L, respecyively. The sensitivities of the four host populations to methomyl were as follow: B. hispida, C. sativus, M. charantia, L. cylindrica, and their LC50 values were 0.302, 0.318, 0.652 and 0.804 mg/L, respectively. The sensitivities to spinosad were C. sativus, B. hispida, L. cylindrica and M. charantia, and with the LC50 values of 1.157, 1.198, 1.232 and 2.029 mg/L, respectively. The sensitivities to acetamiprid were in the order of M. charantia, B. hispida, C. sativus and L. cylindrica, and their LC50 value were 17.946, 20.166, 20.190 and 21.986 mg/L, respectively. The largest difference between different host populations was abserved in the sensitivities when they were treated by emamectin benzoate with 4.140 fold, and following treated by methomyl, which was 2.654 fold, the smallest sensitivity difference was abserved in acetamiprid, with 1.225 fold. This implies host plants can cause changes in the susceptibility of Z. cucurbitae to insecticides.