6%灭得优和25%甲基嘧啶磷对白纹伊蚊的现场控制效果比较研究

目的比较探索快速有效控制白纹伊蚊成虫的药物,为化学防制提供理论依据。方法在轮胎堆放场、居民小区、公园3种场所采用超低容量喷雾(ULV)喷洒6%灭得优和25%甲基嘧啶磷,采用叮人法、挂笼法,孳生地阳性率考核控制白纹伊蚊的效果。结果用6%灭得优油剂(平均应用剂量0.10～0.45ml/m2)喷洒4h后,叮人率指标相关密度指数(RPI)分别为0、2.2和0,但维持时间相差较大,公园持效最短,不超过2d(用药2d后RPI为98.9),轮胎堆放场持效最长,超过4d(用药4d后RPI为53.0),挂笼法试验24h白纹伊蚊死亡率达到99%以上,该药对白纹伊蚊幼虫也有一定的控制作用。25%甲基嘧啶磷乳油对轮胎堆放场所(平均应用剂量0.08ml/m2)白纹伊蚊成虫的控制时间为48h,孳生地阳性率下降50%以上;对居民区室外环境(平均剂量0.03ml/m2)白纹伊蚊的有效控制效果达到96h。结论在白纹伊蚊高密度场所,ULV喷洒6%灭得优和25%甲基嘧啶磷,短期内均能取得较满意的控制成虫效果,对孳生地幼虫也有一定的控制作用。

Studies on Field Control Efficiency of 6% Miedeyou and 25% Pirimiphos-methyl Against Aedes albopictus in Shanghai

Objective To evaluate the field control efficiency against Aedes albopictus with 6% Miedeyou and 25% Pirimiphos methyl. Methods To apply these insectcides against Aedes albopictus with ULV sprayer in park,residential area,tyre cumulated site. The indexes for efficiency analying were human attacked, mosquito cage hanging and larva breeding. Results The RPI were 0, 2.2 and 0 respectively in park, residential area and tyre piling up site contrasted with the control experiment 4 h after dealing with 6% Miedeyou Emulsifiable Solution. The effective maintained time varied in three trial fields, not more than 2 days in park, but more than 4 days in tyre piling up. More than 99% calibrated mortality of Aedes albopictus in cages were observed in three testing areas 24 h after the same trial. The rate of larva breeding after treated with 6% Miedeyou Emulisifiable was lower than control. The control efficiency times for Aedes albopictus after dealing with 25% rimiphos methyl was 48 h at the tyre cumulated site and the rate of larva was decline 50%, the control efficiency times for Aedes albopictus after dealing with 25%rimiphos methyl was 96 h at the residential area. Conclusion 6% Miedeyou emulsifiable solution and 25% Pirimiphos methyl can rapidly kill the adult and larva of Aedes albopictus in field with ULV sprayer. The methods and technology can be provide to the victor emergency control.