2007年江浙地区二化螟抗药性检测

 【目的】2007年测定江苏、浙江地区二化螟对杀虫单、三唑磷、氟虫腈、阿维菌素及拟除虫菊酯类等9种杀虫剂的抗性，以及6类20种杀虫剂对东海二化螟的毒力，为指导用药提供科学依据。【方法】采用4龄幼虫点滴法测定。【结果】（1）瑞安、苍南、高淳种群对杀虫单具有极高水平抗性（164.8～248.1倍），连云港和东海种群具有中等水平抗性（18.1和25.1倍）。（2）5个种群对三唑磷的敏感性变化很大，其中瑞安、苍南、高淳种群为极高水平抗性（204.8～1395.2倍），连云港和东海种群未检测到明显的抗性（1.8和3.1倍）。（3）瑞安、苍南种群对氟虫腈为中等水平抗性（12.3和26.8倍），其它3个种群为敏感水平（1.3～2.9倍）。（4）苍南种群对阿维菌素产生低水平的抗性（7.6倍），其它种群尚处于敏感水平（0.9～2.0倍）。（5）瑞安、苍南种群对氯氟氰菊酯、氰戊菊酯、高效氯氰菊酯、高效氟氯氰菊酯及溴氰菊酯为中～高水平的抗性，其它3个种群对除氰戊菊酯以外的4种拟除虫菊酯为低～中水平的抗性（5.3～31.2倍）。（6）测试的20种药剂对东海种群二化螟的毒力次序为：阿维菌素、甲氨基阿维菌素>伊维菌素、高效氟氯氰菊酯＞丁烯氟虫腈、氟虫腈、氰戊菊酯、氯氟氰菊酯、溴氰菊酯、高效氯氰菊酯、虫酰肼≥辛硫磷、喹硫磷、呋喃虫酰肼、三唑磷、哒嗪硫磷＞马拉硫磷、毒死蜱、氟硅菊酯>杀虫单。【结论】不同地区二化螟种群对药剂的抗性存在差异，应根据当地的抗性水平有针对性地进行抗性治理。

Resistance Monitoring of the Striped Stem Borer, Chilo suppressalis,(Lepidoptera Pyralidae)in Jiangsu and Zhejiang Provinces in 2007

【Objective】 This study monitored the resistance to nine insecticides in different populations of the striped stem borer, Chilo suppressalis (Walker), collected from Zhejiang and Jiangsu provinces in 2007, sensitivity of Donghai population to 20 insecticides was evaluated as well. The results have provided useful information for the resistance management strategies of the striped stem borer. 【Method】 Topical application method was used in the experiment. 【Result】 The results showed that Rui’an, Cangnan and Gaochun populations developed extremely high levels of resistance to monosultap (164.8 to 248.1 fold), and Lianyungang and Donghai populations had moderate levels of resistance (18.1 and 25.1 fold respectively). The resistance to triazophos varied greatly in five populations, from having extremely high levels of resistance in Rui’an, Cangnan and Gaochun populations (204.8 to 1395.2 fold), to being susceptible in Lianyungang and Donghai populations (1.8 and 3.1 fold respectively). Moderate resistance levels to fipronil were monitored in Rui’an and Cangnan populations (12.3 and 26.8 fold respectively), while other three populations tested were susceptible to fipronil (1.3 to 2.9 fold). A low level of resistance to abamectin was detected in Cangnan population (7.6 fold), and other four populations tested remained susceptible to abamectin (0.9 to 2.0 fold). Rui’an and Cangnan populations had moderate or high levels of resistance to cyhalothrin, fenvalerate, beta-cypermethrin, beta-cyfluthrin and deltamethrin (22.1-115.6 fold), while Lianyungang, Donghai and Gaochun populations had low or moderate levels of resisitance to cyhalothrin, fenvalerate, beta-cypermethrin, beta-cyfluthrin and deltamethrin (31.2-5.3 fold). The sensitivity to 20 insecticides was evaluated in Donghai population of Jiangsu province. The toxicity sequence of 20 insecticides to the population was as follows: abamectin, emamectin benzoate＞ivermectin, beta-cyfluthrin＞butene-fipronil, fipronil, fenvalerate, cyhalothrin, deltamethrin, beta-cypermethrin, tebufenozide≥phoxim, quinaphos, furan-tebufenozide, triazophos, pyridaphenthion＞malathion, chlorpyrifos, silafluofen＞monosultap. 【Conclusion】 The resistances to insecticides varied significantly with populations of the striped stem borer, so the resistance management strategies should be proposed according to the local situation.