The cross-resistance patterns and biochemical characteristics of an imidacloprid-resistant strain of the cotton aphid

Abstract

The imidacloprid-resistant strain of Aphis gossypii (RF₆₀) was further selected with imidacloprid to establish the more resistant strain (RF₇₅). After the selection for 15 generations, the resistance ratio relative to the susceptible strain increased from 66.60 to 72.60. The RF₇₅ strain showed different levels of cross-resistance to all the insecticides tested. Synergistic and metabolic enzyme assays suggested that carboxylesterase and cytochrome P450 may play important roles in the imidacloprid resistance.