广州市白云区2017年白纹伊蚊幼虫对常用杀虫剂的抗药性调查

目的 初步了解广州市白云区不同片区白纹伊蚊幼虫对常用卫生杀虫剂的抗药性现状,分析成因,提出治理对策。方法 在广州市白云区各街镇采集白纹伊蚊幼虫,在实验室繁殖1代后,采用幼虫浸渍法进行测定。结果 本区白纹伊蚊对5种常用杀虫剂均产生了不同程度的抗药性,LC₅₀介于0.007~3.789 mg /L,抗性倍数介于2.66~18.12倍。其中高效氯氰菊酯抗性最高,除东片区为低抗外,其它均为中抗;其次为双硫磷,除西、北片区为低抗外,其它均为中抗;抗性最弱的是残杀威,除南片区为低抗外,其它均为敏感;氯菊酯除西片区为中抗外,其它均为低抗;溴氰菊酯除北片区为中抗外,其它均为低抗。LC₅₀分别为介于0.039~0.098,0.007~0.014,2.372~3.789,0.110~0.358,0.016~0.030 mg /L;抗性倍数分别为介于7.21~18.12,7.08~14.17,2.66~4.26,3.38~11.01,6.37~11.95。结论 白纹伊蚊抗性产生的根本原因在于各镇街消杀站及PCO公司的不规范用药,为延缓抗性产生,政府部门需做好药物配比、施药步速、消杀频次等方面的质量把控。

Investigation on resistance of Aedes albopictus larvae to common insecticides in Baiyun District,Guangzhou, 2017

Objective To understand the current status of the resistance of Aedes albopictus larvae to common insecticides in different areas of Baiyun District, analyze the causes and put forward the countermeasures. Methods The larvae of Ae. albopictus were collected in the streets, towns of Baiyun District. After breeding one generation in laboratory, the larvae were used for the determination. Results The Ae. albopictus larvae had different degrees of resistance to five commonly used insecticides. The LC₅₀ was between 0.007 and 3.789 mg/L and the resistance multiple was between 2.66 and 18.12. Among the five insecticides, the resistance of Ae. albopictus larvae to beta-cypermethrin was the highest, and except in the east area, Ae. albopictus larvae had the low resistance to beta-cypermethrin, and the larvae had moderate resistance in other areas. Secondly, for abat, in the west and north areas, Ae. albopictus larvae had the low resistance to it, and in the other areas, the Ae. albopictus larvae had moderate resistance. The resistance of Ae. albopictus larvae to propoxur was the weakest, and in the southern area, the larvae had low resistance to propoxur, and in the other areas, the Ae. albopictus larvae were sensitive to propoxur. For permethrin, in the west area, the Ae. albopictus larvae had moderate resistance to it and in the other areas, the larvae had low resistance. For deltamethrin, in the north area, the Ae. albopictus larvae had moderate resistance to it, and in the other areas, the larvae had low resistance. The LC₅₀(s) of the five common insecticides were between 0.039 and 0.098, 0.007 and 0.014, 2.372 and 3.789, 0.110 and 0.358, 0.016 and 0.030 mg/L, respectively; and the resistance multiples were between 7.21 and 18.12, 7.08 and 14.17, 2.66 and 4.26, 3.38 and 11.01, 6.37 and 11.95, respectively. Conclusion The primary cause of Ae. albopictus larvae having the resistance to the commonly used insecticides is that the disinfection stations of the streets and towns and PCO company lack of the standardization medication, and therefore, the authorities should complete the quality control of the drug ratio, pace of application, frequency, and others in order to delay the resistance.