Insecticide Resistant Strains of House Flies(Musca domestica)Show Limited Cross-Resistance to Chlorfenapyr

摘要

The toxicity of chlorfenapyr was evaluated against susceptible and pyrethroid resistant strains(laboratory and field collected)of house fly(Musca domestica L.).In one laboratory strain no cross-resistance was detected,2.3-fold cross-resistance was detected in another strain,and a 2-fold negative cross-resistance was found in two strains.In field collected populations cross-resistance levels were also low(1.2-to 1.6-fold).These results suggest that the initial utility of chlorfenapyr for house fly control would not likely be compromised by cross-resistance,and that not all strains that have enhanced monooxygenase-mediated resistance will have negative cross-resistance to chlorfenapyr.The P450 isoform responsible for the activation of chlorfenapyr is discussed.