宁夏地区烟粉虱对5种常用杀虫剂的抗药性

Resistance of Bemisia tabaci to five insecticides in Ningxia

采用浸叶法分别测定了宁夏8个地区烟粉虱成虫田间种群对4类5种杀虫剂的抗性。结果表明,供试烟粉虱种群对高效氯氰菊酯已产生了中等至极高水平抗性,抗性倍数为33.31~227.98倍;对烯啶虫胺产生了中等至高水平抗性,抗性倍数为12.14~69.33倍;对毒死蜱和吡虫啉产生了低至中等水平抗性,抗性倍数分别为7.63~38.85倍和6.05~22.43倍,个别地区种群对吡虫啉尚处于敏感水平;对阿维菌素处于敏感性降低至中等水平抗性,抗性倍数为4.54~13.22倍。烟粉虱对5种杀虫剂的抗性有明显的区域性,抗性最为普遍且严重的地区为贺兰新平和吴忠,其次为贺兰产业园、石嘴山大武口、中卫和永宁,而西夏区军马场、固原烟粉虱种群的抗性则相对较低。对银川3地烟粉虱抗药性监测结果表明,在5种杀虫剂中,其对高效氯氰菊酯的抗性发展最为迅速,其次为烯啶虫胺,对阿维菌素和吡虫啉的抗性发展相对较慢,而西夏区军马场和贺兰产业园种群对毒死蜱敏感性有所恢复。

Resistance of eight populations of Bemisia tabaci collected from Ningxia to five insecticides was determined by leaf dipping method.The results showed that these populations of B.tabaci showed medium to extremely high level of resistance to beta-cypermethrin,with the resistance ratios of 33.31-227.98,and medium to high level of resistance to nitenpyram with the resistance ratios of 12.14-69.33.The B.tabaci developed low to medium level of resistance to chlorpyrifos and imidacloprid,and the resistance ratio was 7.63-38.85 and 6.05-22.43,respectively.However,some populations still kept sensitive to imidacloprid.Decreased sensitivity of B.tabaci to abamectin was found in some populations,and medium resistance in other populations,with resistance ratio of 4.54-13.22.The results of this study showed that the resistance of B.tabaci to the five insecticides was regionally distributed,and the Xinping,Helan and Wuzhong populations showed the most serious resistance,followed by Helan Industrial Park,Dawukou,Zhongwei and Yongning populations,while Xixia and Guyuan populations showed the lowest resistance.The results also showed that the three populations from Yinchuan developed resistance to beta-cypermethrin most quickly,followed by nitenpyram,and the development of resistance to abamectin and imidacloprid was relatively slow,while the sensitivity to chlorpyrifos in populations from Xixia Military Horse Farm and Helan Industrial Park was recovered to some extent.