河南省濮阳市中华按蚊对杀虫剂敏感性调查

目的　了解河南省濮阳市中华按蚊对马拉硫磷、溴氰菊酯、高效氯氟氰菊酯的敏感性，为当地传疟媒介控制提供科学依据。方法　选择河南省濮阳市濮阳县为调查点，于2018年9月和2020年7月捕捉中华按蚊，采用滤纸接触筒法测定中华按蚊对马拉硫磷、溴氰菊酯、高效氯氟氰菊酯的敏感性，应用WHO抗药性评价标准确定抗性级别。结果　2018年和2020年捕获的中华按蚊对马拉硫磷的半数击倒时间（KT50）分别为91.08 min和40.95 min，60 min击倒率分别为37.50%和60.87%，24 h死亡率分别为90.91%和100%，抗性级别分别为初步抗性（M）和敏感（S）；对溴氰菊酯的KT50分别为415.56 min和341.19 min，60 min击倒率分别为22.92%和16.98%，24 h死亡率分别为22.92%和16.98%，抗性级别均为抗性（R）；对高效氯氟氰菊酯的KT50分别为164.22 min和236.22 min，60 min击倒率分别为30.39%和38.30%，24 h死亡率分别为19.60%和21.28%，抗性级别均为R。结论　河南省濮阳市中华按蚊对马拉硫磷较敏感，但对溴氰菊酯和高效氯氟氰菊酯已产生高度抗性。

Susceptibility of Anopheles sinensis to insecticides in Puyang City,Henan Province

Objective　To investigate the susceptibility of Anopheles sinensis to malathion, deltamethrin and lambda?cyhalothrin in Puyang City, Henan Province, so as to provide the scientific basis for local malaria vector control. Methods　An. sinensis was captured from Puyang County, Puyang City of Henan Province in September 2018 and July 2020, and the susceptibility of field captured An. sinensis to malathion, deltamethrin and lambda?cyhalothrin was tested using the filter?paper bioassay recommended by WHO. The insecticide resistance level was assessed based on the WHO criteria. Results　In 2018 and 2010, the half knock?down times (KT50) of malathion were 91.08 min and 40.95 min for An. sinensis, with knock?down rates of 37.50% and 60.87% 60 min post?exposure to malathion and 24?hour mortality rates of 90.91% and 100%, respectively, and the insecticide resistance levels were moderately resistant (M) and susceptible (S). The KT50 of deltamethrin were 415.56 min and 341.19 min for An. sinensis in 2018 and 2020, with knock?down rates of 22.92% and 16.98% 60 min post?exposure to malathion and 24?hour mortality rates of 22.92% and 16.98%, and the insecticide resistance levels were all resistant (R). The KT50 of lambda?cyhalothrin were 164.22 min and 236.22 min for An. sinensis in 2018 and 2020, with knock?down rates of 30.39% and 38.30% 60 min post?exposure to malathion and 24 h mortality rates of 19.60% and 21.28%, respectively, and the insecticide resistance levels were all R. Conclusion　An. sinensis is relatively susceptible to malathion but has developed high?level resistance to deltamethrin and lambda?cyhalothrin in Puyang City, Henan Province.