Objective To investigate the insecticide resistance of Musca domestica in Wuhan, China, and to provide a scientific basis for rational use of insecticides. Methods During 2009-2015, wild M. domestica was collected from residential areas, farmers’ markets, and refuse transfer stations in four districts (Jiang'an, Jianghan, Hanyang, and Wuchang) in Wuhan; they were bred in the laboratory for 1-2 generations and then were tested for the median lethal dose (LD50) of seven commonly used insecticides using the micro-drip method; the resistance ratios were calculated and the Kruskal-Wallis H test was used to compare the inter-population differences between different districts. Results The resistance ratios to DDVP, azamethiphos, chlorpyrifos, deltamethrin, cypermethrin, beta-cypermethrin, and tetramethrin of the M. domestica populations in the four districts in Wuhan were 11.26-20.72, 23.21-72.69, 49.28-108.20, 251.50-454.50, 66.85-129.24, 91.43-115.54, and 4.84-6.80, respectively. There were no statistical differences in the resistance to the seven insecticides between the M. domestica populations in the four districts (all P>0.05). Conclusion The M. domestica in Wuhan has intermediate resistance and low resistance (or sensitivity) to DDVP and tetramethrin, respectively, and has high resistance or extremely high resistance to azamethiphos, chlorpyrifos, deltamethrin, cypermethrin, and beta-cypermethrin; the levels of insecticide resistance are associated with the usage degree of insecticides and are affected by regions to a minor degree. Therefore, it is suggested to apply insecticides rationally in the future fly control in each district, thus delaying the development of insecticide resistance of M. domestica.
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