Objective To investigate the population distribution and density of flies and the insecticide resistance levels of Musca domestica in Nanjing, China, so as to provide a basis for formulating scientific, rational, and effective prevention and control measures.Methods From March to November, 2022, the cage trapping method was used for fly ecological surveillance, and the topical application method was used to determine the insecticide resistance of M. domestica. The density and composition ratio of flies were calculated using Excel 2010. Using SPSS 23.0 software, a Probit regression analysis was performed to calculate the median lethal dose (LD50), regression equation, and resistance ratio.Results M. domestica was the dominant species of flies in Nanjing in 2022, accounting for 21.85%. The average annual fly density was 2.94 flies/cage in Nanjing. Among the surveillance points, Liuhe District had the highest fly density of 8.85 flies/cage. Among different habitats, farmers' markets had the highest fly density of 3.44 flies/cage. Among different fly species, M. domestica showed the highest density in four habitats, which was 0.64 flies/cage. The fly density showed a unimodal pattern, which reached a peak in July at 5.95 flies/cage. For M. domestica, the LD50 values of deltamethrin, beta-cypermethrin, dichlorvos, phoxim, and propoxur were 0.172 7, 0.288 6, 0.145 2, 0.114 3, and 0.916 7 μg/individual, respectively; the resistance ratios were 863.50, 41.23, 242.00, 36.87, and 3.08, respectively.Conclusions M. domestica was the dominant fly species in Nanjing, with varying degrees of resistance to deltamethrin, beta-cypermethrin, dichlorvos, and phoxim. The use of these four insecticides should be stopped or reduced, and some sensitive and low-resistance insecticides should be selected for rotation gradually.
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