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分别于2010和2011年采用点滴法测定了辽宁省辽阳地区张台子、柳壕和大石桥3个稻水象甲Lissorhoptrus oryzophilus Kuschel田间种群对吡虫啉等6种杀虫剂的敏感性。发现不同种群对同一药剂的敏感性相差可达4.2～49.4倍;2011年大石桥种群对阿维菌素等3种药剂的敏感性较2010年有所下降。通过室内毒力测定筛选出了5种可有效防治稻水象甲的药剂组合:阿维菌素和三唑磷、氯虫苯甲酰胺和三唑磷分别按质量比1∶1和1∶3组合,多杀菌素和辛硫磷按质量比1∶3组合。比较了3个种群稻水象甲成虫羧酸酯酶(CarE)、乙酰胆碱酯酶(AChE)和谷胱甘肽S-转移酶(GSTs)的活性,初步探讨了其敏感性不同的可能机制。研究结果可为该地区稻水象甲的有效控制提供参考。
The sensitivity of 6 populations of imidacloprid to three field populations of Lissorhoptrus oryzophilus Kuschel in Zhangtaizi, Liuhao and Dashiqiao areas in Liaoyang of Liaoning Province in 2010 and 2011 were determined respectively. The sensitivity of different populations to the same agent was found to be 4.2 ~ 49.4 times. In 2011, the sensitivity of Dashiqiao population to 3 agents including abamectin decreased compared with that of 2010. Five kinds of drug combinations that can effectively prevent and treat water weevil were screened out through indoor toxicity determination: avermectin, triazophos, chlorantraniliprole and triazophos were respectively mixed at the mass ratio of 1: 1 and 1: 3 Combination, spinosad and phoxim at a mass ratio of 1: 3 combination. The activities of carboxylesterase (CarE), acetylcholinesterase (AChE) and glutathione S-transferase (GSTs) in three species of rice waterfly were compared, and the possible mechanisms of their different sensitivities were discussed. The results can provide reference for the effective control of the rice water weevil.