Study on the Differences of Three key Enzyme Activities of Different Geographical Populations of Aphis gossypii in Xinjiang and Their Correlation with Resistance

【Objective】 Objective to explore the difference of three enzyme activities and drug resistance of different geographical populations of Aphis gossypii in Xinjiang. 【Methods】 The activities of carboxylesterase, glutathione-S-transferase and acetylcholinesterase of Aphis gossypii and laboratory sensitive populations in Korla, Wujiaqu, Shihezi, Kuitun and Hami of Xinjiang were determined, and the relationship between the activities of the three enzymes and imidacloprid resistance was analyzed. 【Results】 The specific activity ratios of acetylcholinesterase and glutathione-S-transferase in Korla, Wujiaqu, Shihezi, Kuitun and Hami were 4.2, 2.7, 2.3, 2.5, 2.1 times and 2.3, 1.5, 1.3, 2.5, 2.1 times, respectively（P < 0.05）; the specific activity ratios of carboxylesterase were 6.5, 4.2, 3.4, 2.7, 1.2 times, except Hami, the other areas were significantly higher than 1.2 times There was a certain correlation between two key detoxification enzymes and one key neurotransmitter enzyme of Aphis gossypii and drug resistance. 【Conclusion】 The results showed that the activities of three kinds of enzymes in different populations were significantly higher than those in sensitive populations（P <0.05）, and there were differences among them. Carboxylesterase may play an important role in the process of Aphis gossypii feeling imidacloprid stress.