浙江菜区斜纹夜蛾对几类杀虫剂的敏感性

Sensitivity to several types of insecticides in field populations of Spodoptera litura in Zhejiang Province

为明确浙江菜区斜纹夜蛾对主要杀虫剂的抗药性发展趋势，采集了浙江三门和萧山地区田间斜纹夜蛾，监测其对11种杀虫剂的敏感性水平。结果表明，三门种群和萧山种群对这些杀虫剂的敏感性存在明显差异，且萧山种群对测试药剂的敏感性高于三门种群。参考抗性诊断剂量（田间推荐浓度）处理后存活率和11种杀虫剂LC99致死浓度与田间推荐浓度的比值，推断三门种群对氯虫苯甲酰胺和溴虫腈敏感，对茚虫威、甲氨基阿维菌素苯甲酸盐、啶虫隆、丁醚脲和多杀菌素的敏感性下降，对虫酰肼、乙基多杀菌素、阿维菌素和高效氯氰菊酯已产生抗性；同样，萧山种群对氯虫苯甲酰胺、溴虫腈和多杀菌素敏感，对甲氨基阿维菌素苯甲酸盐、丁醚脲、啶虫隆、乙基多杀菌素、茚虫威、阿维菌素敏感性下降，对虫酰肼和高效氯氰菊酯产生抗性。因此，浙江菜区斜纹夜蛾对大部分监测杀虫剂的抗性正在形成，已产生抗性的高效氯氰菊酯、阿维菌素、虫酰肼应暂停使用1～2年；其余药剂则需要控制用药次数和采用不同种类杀虫剂轮用、混用的方式以延缓抗药性的产生。

To characterize the developmental trend of resistance to insecticides of oriental leafworm moth （ OLM ） , Spodoptera litura, in Zhejiang province , the sensitivities to 11 insecticides of OLMs collected from Sanmen and Xi-aoshan were studied and compared .Significant differences were shown between the data of OLMs from the two cities , i.e.the acquired sensitivities to 11 insecticides of OLMs from Sanmen were higher than those of OLMs from Xiaos-han.Refering to the survival rate of OLMs after treating at discriminating doses , together with the ratio of insecticidal LC99 to field recommended concentration , it could be deduced that OLMs in Sanmen was still sensitive to chlorantra-niliprole, chlorfenapyr; sensitivities to indoxacarb, emamectin benzoate, chlorfluazuron, diafenthiuron, spinosad have declined;and resistances to tebufenozide , spinetoram and beta-cypermethrin have developed .While the OLMs in Xiaoshan were sensitive to chlorantraniliprole , chlorfenapyr and spinosad; sensitivity to emamectin benzoate , diafenthiuron , chlorfluazuron , spinetoram , indoxacarb , abamection had declined , and resistances to beta-cyper-methrin have developed .Therefore, resistance levels of OLMs to most of the insecticides monitored were increasing in Zhejiang province , and beta-cypermethrin , abamection , tebufenozide that OLMs had developed resistance should be stopped using for one or two years , and the rest still can be applied to control OLMs by the methods of limiting the frequency of spraying , rotation or mixture of different kinds insecticides in order to delay the development of resist -ance.