旅客列车德国小蠊抗药性的调查研究

Studies on Insecticide Resistance in Blattella germanica at Passenger Trains

目的 :了解旅客列车德国小蠊对二氯苯醚菊酯、氯氰菊酯、溴氰菊酯、敌敌畏和残杀威的抗药性。方法 :点滴法。结果 :旅客列车上采集的 5个品系德国小蠊与敏感品系比较 ,对二氯苯醚菊酯、氯氰菊酯和溴氰菊酯的抗性系数分别为 16 .2～ 37.6、4.0～ 15 .7和 4.5～ 2 1.3,对敌敌畏和残杀威的抗性系数分别为 3.0～ 32 .7、1.3～12 .4。所有品系对二氯苯醚菊酯均产生了抗药性 ,尤其南方品系 (SD)对 5种杀虫剂已产生程度不同的抗性。结论 :旅客列车德国小蠊对 5种杀虫剂敏感性和抗药性不一 ,化学防制须合理选择药物。

Objective: To investigate the insecticide resistance of Blattella germanicaat passenger trains. Method: Dropping method. Result: The sensitivity of five field-collected strains (OD、WD、NW、SD、SW) of Blattella germanica to permethrin, cypermethrin, deltamethrin, dichlorovos and propoxur was tested with a topical application method to estimate LD 50 . The results indicated a high level of resistance in these strains to permethrin, the LD 50 resistance ratios (RRS) for permethrin were 23.1 , 16.2 , 18.3 , 37.6 and 20.8 for OD, WD, NW, SD and SW respectively. The results also showed that a different resistance to five-measured insecticides appeared in the SD strain. Conclusions: It was suggested that cockroach control at railway passenger trains by chemical method should suitably select insecticide, employed concentration and ways.