植物灭螺剂“螺威”杀灭湖北钉螺药效试验研究

Efficiency Trials of Plant Molluscicide "Lo-wei" on Killing Oncomelania Hubei

采用室内和现场试验评价植物灭螺剂"螺威"杀灭湖北钉螺药效。室内采用泥盘喷洒、烧杯浸杀法,用敲击法鉴定钉螺死亡数和存活数,观察不同浓度植物灭螺剂"螺威"对湖北钉螺的杀灭效果。结果表明:7.5,5.0,2.5g/m33个浓度的4%螺威粉剂(TDS)室内浸杀湖北钉螺48 h死亡率为100%;室内喷洒试验7.5,5.0,2.5 g/m33个试验浓度中7.5,5.0 g/m3浓度组均达到死亡率95%以上,浓度为2.5 g/m3的4%螺威粉剂(TDS)现场浸杀湖北螺钉72 h死亡率为100%;喷洒湖北螺钉360 h死亡率为90.03%。4%螺威粉剂(TDS)室内浸杀、喷洒试验和现场浸杀、喷洒试验对湖北钉螺药效均达到合格指标。

In this paper laboratory and field tests are introduced to evaluate the effects of plant mulluscicide ＂Lo-wei＂ on killing oncomelania Hubei.In the laboratory,through spraying into a mud tray,immersing in a flask and hammering to identify the mortality and survival number of molluscicide,we have observed the effects of different concentration plant molluscicides ＂Lo-wei＂.In laboratory test,the oncomelania mortality is 100% when immerged in 4% Lo-wei powder（TDS） with 7.5 g/m3,5.0 g/m3 and 2.5 g/m3 concentrations for 48 hours,in which the mortality is more than 95% when sprayed with 7.5 g/m3,5.0 g/m3 concentrations of the same TDS.For the in-situ test,the mortality is 100% when immerged in 4% TDS with 2.5 g/m3 concentration in 72 hours,while when sprayed,the oncomelania mortality is 90.03% in 360 hours.Whether immerging and spraying in laboratory test or in-situ test,the efficiency of 4% TDS on killing oncomelania Hubei has reached the qualified index.