江苏草莓二斑叶螨对5种杀螨剂的抗药性监测

Resistance Monitoring of Tetranychus urticae Koch to Five Acaricides in Jiangsu Province

为明确江苏草莓二斑叶螨田间种群对常用杀螨剂的抗药性,在室内采用叶片浸渍法,分别测定了南京溧水、栖霞、高淳、江宁,镇江白兔,泰州泰兴,常州嘉泽,徐州碾庄等8个地区草莓二斑叶螨田间种群对5种杀螨剂的抗性水平。结果表明,江苏8个地区草莓二斑叶螨田间种群大部分对30%乙唑螨腈悬浮剂、43%联苯肼酯悬浮剂、30%腈吡螨酯悬浮剂、20%丁氟螨酯悬浮剂4种杀螨剂处于敏感水平,部分处于低至中等水平抗性(RR=5.045~36.267),仅江宁种群对43%联苯肼酯悬浮剂属于高水平抗性(RR=62.605)。但各田间种群对3%阿维菌素微乳剂均具有抗性,抗性倍数在6.599~340.995之间,处于低至极高水平抗性。不同杀螨剂的抗性水平存在显著的地区间差异,在草莓二斑叶螨的防治中应根据当地用药背景,注意轮换用药,以延缓抗性的产生。

In order to clarify the resistance status of strawberry Tetranychus urticae to common acaricides in Jiangsu Province,we monitored the resistance level of T.urticae collected from Lishui,Qixia,Gaochun and Jiangning in Nanjing city,Baitu in Zhenjiang city,Taixing in Taizhou city,Jiaze in Changzhou city and Yanzhuang in Xuzhou city to five acaricides using a leaf-dip bioassay.The results showed that most of the field populations in 8 regions were sensitive to four acaricides,including cyetpyrafen 30%SC,bifenazate 43%SC,cyenopyrafen 30%SC and cyflumetofen 20% SC(RR=5.045-36.267),and some were in low to moderate level of resistance.Only Jiangning population had high resistance to bifenazate 43%SC(RR=62.605).However,all the field populations had resistance to avermectin 3% ME,and the resistance ratio ranged from 6.599 to 340.995,which was at a low to very high level of resistance.There were significant regional differences in the resistance levels of different acaricides.In the control of strawberry T.urticae,attention should be paid to the rotation of insecticides according to the local background of insecticide use,to the development of insecticide resistance.