Survey on resistance to insecticides of Musca domestica in Hangzhou city

Objective To investigate the resistance of Musca domestica and provide the scientific information for using insecticides reasonably. Methods The resistance of M.domestica to deltamethrin, beta-cypermethrin, permethrim, cyperimethrin, esbiothrin, DDVP and tetramethrin were determined by topical application methods. Results The resistance of the field strain to seven insecticides was higher in 2005 than that in 1982, the ratio of resistance to beta-cypermethrin was increased 80.80 times (LD50=0.2020 μg/♀), deltamethrin 52.71 times(LD50=0.0369 μg/♀), cyperimethrin 45.48 times(LD50=0.3775 μg/♀), permethrim 20.63 times(LD50=0.1857 μg/♀), tetramethrin 4.86 times(LD50=1.1362 μg/♀), DDVP 4.06 times(LD50=0.4306 μg/♀) and esbiothrin 1.72 times(LD50=0.3946 μg/♀). Conclusion The resistance of the field strain to beta-cypermethrin, deltamethrin, cyperimethrin, permethrim were of high level and these insecticides should be reduced application for the future.