关键词: 家蝇, 杀虫剂, 抗药性

Abstract: Objective To understand the resistance of Musca domestica to insecticides in the four areas of Shaanxi province for providing evidence for scientific application of insecticides. Methods Insects were collected in the fields in urban areas where flies bred and sensitive insects were reared in laboratory without exposure to insecticides. Topical dropping method was used to determine the death rate by different drug concentrations, with LD₅₀ obtained by POLO software analysis. Results The LD₅₀ of sensitive insects to DDVP, temephos, DDT, propoxur, beta-cypermethrin, deltamethrin, cypermethrin and permethrin was 0.004, 0.113, 0.010, 0.214, 0.003 07, 0.000 63, 0.003 and 0.013 μg/♀, respectively. Different degrees of resistance of M. domestica to the eight commonly used insecticides were observed in Ankang, Weinan, Baoji, Tongchuan city of Shaanxi province. The LD₅₀ of M. domestica in four areas to DDVP, temephos, DDT, propoxur, beta-cypermethrin, deltamethrin, cypermethrin and permethrin was 0.051-0.301, 4.429-14.480, 1.259-1.573, 13.579-33.556, 0.024-0.303, 0.017-0.046, 0.047-0.269 and 0.016-0.053 μg/♀, respectively, with the average LD₅₀ to the eight insecticides from 0.028 to 23.549 μg/♀. The resistance ratio (R/S) was from 2.54 to 140.20, DDT being the highest and permethrin the lowest. Conclusion Insecticides should be applied scientifically to effectively curb the increase of resistance of M. domestica to the insecticides.

Key words: Musca domestica, Insecticide, Insecticide resistance