4种不同液体蚊香在野外对流行性乙型脑炎媒介控制效果研究

目的研究4种电热液体蚊香[0．12％四氟甲醚菊酯（A），0．17％四氟甲醚菊酯（B），0．86％四氟苯菊酯（C），0．86％四氟丙炔菊酯（D）]在野外对流行性乙型脑炎（乙脑）媒介的控制效果。方法采用人诱法，比较测定控制蚊虫前、后密度的下降率，调查蚊虫密度。结果试验主要蚊虫为传播乙脑的三带喙库蚊和致倦库蚊。蚊香样品中仅有样品A使三带喙库蚊的密度下降率〉80％，样品B、C和D使三带喙库蚊密度下降率均〈80％；蚊香样品A、C、D使致倦库蚊的密度下降率〉80％，样品B使其密度下降率在70％-80％之间。结论4种蚊香样品在现场有良好的驱避致倦库蚊和三带喙库蚊的效果，但是蚊香B的驱蚊效果要差于蚊香样品A、C、D，野外试验结果与实验室药效有差别。

Research on the efficacy of four kinds of electric liquid repellents for the Japanese encephalitis vectors in the field

Objective To test the efficacy of four kinds of electric liquid repellents (A 0.12% dimefluthrin, B 0.17% dimefluthrin, C 0.86% transfluthrin, D 0.86% prallethrin) for the Japanese encephalitis(JE) vectors in the field. Methods The landing count method was used to the investigation of mosquito density before and after treatment by electric liquid repellent.Results The main species caught in the field were Culex pipiens quinquefasciatas and Cx. tritaeniorhynchas, which were the JE vector. Only sample A reached >80% population reduction of Cx. tritaeniorhynchus. Both sample B, C and D caused <80% population reduction of Cx. tritaeniorhynchas. Both sample A, C and D caused >80% population reduction. However, only sample B led to 70%-80% population reduction. Conclusion The tests suggest that four samples have a good repellent effect on mosquito, but the efficacy of sample B is less than that of sample A, C and D. There axe different for the control efficacy of different electric liquid repellent in the lab and the field.