Experimental Study on Susceptibility to Insecticides in Musca domestica(Diptera:Muscidae)from Suzhou Urban Districts

Susceptibility to the pyrethroid tetramethrin and ethofen-prox,the organochloride acetofenate,the organophosphorns phoximand,and the carbamate brodan and propoxur 6 different insecticides in Suzhou populations of Musca domestica was investigated with the topical application manipulated method.Susceptibility to tetramethrin in the field strains of M.domestica from Suzhou urban districts was the lowest level,and resistance ratio reached 6.24-fold.Resistance ratios of ethofenprox,acetofenate,phoximand, brodan and propoxur were 2.43,2.07,1,93,1.37 and 1.03 respectively.The results indicated that susceptibility to the insecticides determined in Suzhou populations of housefly was descending Perhaps this is correlated with cross2resistance among insecticides.