Susceptibility of Four Strains of the Diamondback Moth, Plutella xylostella L., against Insecticides

Abstract

As the first step to clarify the mechanism of insecticide resistance, the susceptibility of 4 strains of the diamondback moth against 4 organophosphorus and 2 carbamate insecticides, cartap and fenvalerate were assessed by the topical application method. The results showed that the resistant strains were highly resistant to 3 organophosphorus compounds (phenthoate, prothiophos and cyanophos), moderately to 2 carbamate insecticides (acephate and methomyl) and cartap, but no obvious resistance was observed for dichlorvos and fenvalerate.