Genetic basis of resistance and studies on cross-resistance in a population of diamondback moth,Plutella xylostella(Lepidoptera:Plutellidae)

摘要

The genetic basis of abamectin resistance was studied in a strain of the diamondback moth,Plutella xylostella(L),following iaboratory selection of a field population collected at Xunhum,Hebei Province,China.Deta from the testing of F_1 progeny from reciprocal crosses between abamectin-resistant and abamectin-susceptible strains indicated that resistance might be autosomal and incompletely recessive with a degree of dominance of -0.13.Chi-squared analyses from the response of a backcross of crossed F~1 progeny and the resistant strain and F~2 progeny were highly significant,suggesting that the resistance was probably controlled by more than one gene.The results of cross-resistance studies showed that there was little cross-resistance between abamectin and four pyrethroid insecticides(deltamethrin,betacypermethrin,fenvalerate and bifenthrin)and no cross-resistance between abamectin and the acylureas chlorfluazuron or flufenoxuron.