大灭微粒胶囊杀虫剂浸泡蚊帐杀灭中华按蚊的效果观察

Residual effect of Demand CS-impregnated bednets to Anopheles sinensis

目的观察微粒胶囊杀虫剂在浸泡尼龙蚊帐上的残效。方法用10、15、20mg/m2的大灭悬浮剂(2.5%高效氯氟氰菊酯)和15mg/m2拜虫杀悬浮剂(12.5%高效氟氯氰菊酯)浸泡尼龙蚊帐;采用WHO推荐的接触筒强迫接触法,观察中华按蚊接触药帐后每分钟的蚊虫击倒数和24h后死亡率。结果大灭悬浮剂10、15、20mg/m2浸泡尼龙蚊帐180d后对中华按蚊的击倒中时(Kt50)分别为21.40、16.20、15.70min,24h后死亡率均为100%;拜虫杀15mg/m2浸泡尼龙蚊帐120d后对中华按蚊的Kt50为16.06min,24h后死亡率为100%。结论2种杀虫剂浸泡的蚊帐均能够有效杀灭疟疾媒介按蚊,但微粒胶囊悬浮剂在尼龙蚊帐上的持效时间较长,效果更好。

Objective To observe the residual effect of Demand CS-impregnated bednets to Anopheles sinensis.Methods The numbers of adult mosquitoes which were knocked down at every minute after treatment were observed by using the enforced contact method recommended by WHO,and the mortality of mosquitoes tested after 24 h was calculated.Results The Kt50 of Demand CS-impregnated bednets with impregnations concentrations of 10,15,20 mg /m^2 to Anopheles sinensis were 21.40,16.20,15.70 min,respectively,and the 24 h mortality was 100%.The Kt50 of Responsar SC（12.5% Beta-cyfluthrin）impregnated bednets with a impregnation concentration of 15 mg /m^2 to Anopheles sinensis was 16.06 min,and the 24 h mortality was 100%,too.Conclusions Both the Demand CS-impregnated bednets and the Responsar SC impregnated bednets can kill Anopheles sinensis.