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目的 :对舰船上德国小蠊的抗药性研究、抗性虫株实验室饲养 2年后的抗性消退研究。方法 :采用WHO规定的果酱瓶法 ,测定溴氰菊酯、高效氯氰菊酯和残杀威对德国小蠊敏感品系、舰船上的现场品系和抗性消退组的上海虫株、大连虫株的药效。结果 :敏感品系KT50 分别为4.48、5 .2 3、13.49min ;现场品系分别为上海 9.67、13.0 0、11.90min ,大连 16.18、15 .35、17.37min ,抗性系数分别为 0 .88～ 2 .49和 1.2 9～ 3.61;抗性消退组KT50 分别为上海 4.85、4.68、8.77min ,大连4.47、6.12、10 .2 0min ,抗性系数降为 0 .65～ 1.0 8和 0 .76～ 1.17,抗性消退率为 91.2 1%～ 10 7.0 8%。结论 :舰船上的德国小蠊具低至中等抗药性 ,在实验室正常饲养 2年后 ,抗性基本可以消退。
OBJECTIVE: To study the resistance of Blattella germanica to domestic cockroaches and to study the resistance regression of resistant strains in laboratory two years later. Methods: The effects of deltamethrin, beta-cypermethrin and carbofuran on sensitive strains of Blattella germanica, on-line strains on ships and strains of Shanghai and Dalian were determined by the WHO jam jar method . Results: The susceptible lines KT50 were 4.48,5.22 and 13.49 min respectively. The on-site lines were 9.67, 13.0 0 and 11.90 min in Shanghai, 16.18, 15.35 and 17.37 min in Dalian, respectively. The resistance coefficients were 0.88 ~ 2 .49 and 1.2 9 ~ 3.61, respectively. The KT50 of resistant regression group were 4.85,4.68 and 8.77min in Shanghai and 4.47,6.12,10.200min in Dalian respectively, the resistance coefficients decreased to 0.65-1.08 and 0.76-1.17 , The rate of resistance regression was 91.2 1% ~ 10 7.0 8%. CONCLUSIONS: German cockroaches on ships have low to moderate resistance, and after two years of normal laboratory uptake, resistance may subside.