宁夏地区烟粉虱对5种常用杀虫剂的抗药性

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....

Resistance of Bemisia tabaci to five insecticides in Ningxia

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 33.31227.98, and medium to high level of resistance to nitenpyram with the resistance ratios of 12.1469.33. The B. tabaci developed low to medium level of resistance to chlorpyrifos and imidacloprid, and the resistance ratio was 7.6338.85 and 6.0522.43, 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 4.5413.22. 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.