南京地区小菜蛾的抗药性检测及初步分析

利用浸叶法对南京郊区小菜蛾Plutella xylostella的抗药性进行了监测，发现其对拟除虫菊酯类药剂的抗性较高，而对氟虫腈、辛硫磷、毒死蜱、多杀菌素和虫酰肼依然处于敏感阶段。利用抗性小菜蛾测试发现，氧化胡椒基丁醚（增效醚，简称PBO）对拟除虫菊酯具有显著的增效作用。室内敏感性恢复实验表明，在不接触药剂的条件下，小菜蛾对拟除虫菊酯的抗性迅速下降，繁殖10代以后，抗性维持在低抗水平。因此, 小菜蛾的抗药性治理，应充分利用不同药剂的轮换使用，避免单一使用某一品种，以延缓抗性的发展，同时可以利用PBO增强拟除虫菊酯的防治效果，保证这类药剂在小菜蛾防治中的作用。

Insecticide resistance in Nanjing population of the diamondback moth and the corresponding strategy for pesticide application

The field diamondback moth, Plutella xylostella collected from Nanjing was found to be resistant to deltamethrin (24.69-fold tested by leaf dipping). But it was still sensitive to phoxim, chlorpyrifos, fipronil, spinosad and tebufenozide. PBO showed significant synergism to deltamethrin in the resistant moth. Laboratory breeding revealed that the deltamethrin resistance decreased quickly when the diamondback moth was reared without contact with insecticides, and kept in low resistance level after breeding for ten generations. Based on these results, it was suggested that rotational use of effective insecticides and using pyrethroid together with PBO should be rational for management of insecticide resistance in this pest.