Cross resistance of beta-cypermethrin resistant Musca domestica strains to several kinds of insecticides

Objective To explore the beta-cypermethrin resistance Musca domestica strains development and cross resistance to the other three insecticides,and supply evidence for using insecticides reasonably.Methods Topical application method was used.Results The resistance ratio of Musca domestica to beta-cypermethrin increased to 152.907 9 times after 26 generations'selection,and the ratio of cross resistance to deltamethrin was 44.819 6,there was significant cross resistance,multiple resistance to DDVP was 8.789 9,cross resistance was not obvious,multiple cross resistance to propoxur was 0.607 4 with negative cross resistance.Conclusion Long-term use of the same insecticide will result in resistance and also cross resistance to other insecticides.It is necessary to pay attention to the choice of insecticide kinds.