江苏省疟疾媒介中华按蚊对杀虫剂的敏感性

目的了解江苏省疟疾媒介中华按蚊对溴氰菊酯、DDT和马拉硫磷的敏感性。方法从泗洪、扬中、宜兴3县（市）现场捕获野外中华按蚊成蚊并培养子1代成蚊,采用WHO推荐的接触筒强迫接触法,观察计算中华按蚊接触杀虫剂10、15、20、30、40、50、60min的击倒率和24h后死亡率。结果泗洪、扬中、宜兴3县（市）野外中华按蚊子1代接触0.05%溴氰菊酯60min的击倒率分别为28.57%、57.14%和52.38%,24h后死亡率分别为35.71%、57.14%和61.90%,对溴氰菊酯抗性均达到R级;接触4%DDT60min的击倒率分别为9.52%、2.38%和4.76%,24h后死亡率分别为47.62%、50%和40.48%,对DDT的抗性均达到R级;接触5%马拉硫磷60min后击倒率分别为11.90%、28.57%和28.13%,24h后死亡率分别为80.95%、85.71%和93.75%,对马拉硫磷的抗性为M级。宜兴市野外中华按蚊捕获后1、7、15d及其子1代成蚊,接触0.05%溴氰菊酯60min的击倒率分别为54.76%、76.19%、92.86%和52.38%,24h后死亡率分别为54.76%、76.19%、95.23%和61.90%,捕获后1d与子1代成蚊24h后的死亡率差异无统计学意义（χ2=0.44,P〉0.05）。泗洪县中华按蚊子1代雌、雄成蚊接触0.05%溴氰菊酯60min的击倒率分别为28.57%和40.48%,24h后的死亡率为35.71%和42.86%,2种按蚊24h后的死亡率差异无统计学意义（χ2=0.45,P〉0.05）。结论江苏省野外中华按蚊已对溴氰菊酯、DDT产生高度抗性,对马拉硫磷已产生初步抗性。在媒介防制时应采取综合治理措施,以防止抗性进一步升高。

Sensitivity of Anopheles sinensis to insecticides in Jiangsu Province

Objective To understand the sensitivity of Anopheles sinensis to deltamethrin, DDT and malathion in Jiangsu province. Methods The adult mosquitoes were captured from the fields of Sihong, Yangzhong and Yixing counties (cities) and cultured, and by using the method recommended by WHO, their first filial generations knocked down at 10, 15, 20, 30, 40, 50, and 60 min after exposure with insecticides aforementioned were counted, and the mortality of mosquitoes tested after 24 h was recorded. Results The knock d...