Abstract: Objective Objective To evaluate the effects of 3 molluscicides namely 5% niclosamide ethanolamine granules，4% “Luo? wei”（Tea?seed distilled saponins，TDS）and 50% wettable powder of niclosamide ethanolamine salt（WPN）by spraying and pou? drage methods in marshland and lake regions in dry season. Methods Methods An environment with a high snail density was chosen as the experimental field，then the spraying and poudrage experiments were carried out in the field to assess the molluscicidal effects of 5% niclosamide ethanolamine granules，TDS and WPN delivered by spraying and poudrage methods with a concentration of 30， 6 and 2 g/m2 ，respectively，and the molluscicidal effects of the 3 drugs by the two methods were evaluated and compared in differ? ent time. Results Results After the delivery for 15 d，the adjusted snail death rates of the 5% niclosamide ethanolamine granules，TDS and WPN in the spraying experiment were 79.00%，82.29% and 84.83%，respectively，and those in the poudrage experiments were 97.42%，95.27% and 96.62%，respectively. Conclusion Conclusion The molluscicidal effect of poudrage method is better than the spraying method， and the former is worthy of further extension and application in the marshland in dry season.

Key words: Oncomelania hupensis；5% niclosamide ethanolamine granules；4% “Luo ?wei”（Tea ? seed distilled saponins, TDS）； 50% wettable powder of niclosamide ethanolamine salt（WPN）； Molluscicidal effect； Marshland and lake region

摘要： 目的 目的 观察5%杀螺胺乙醇胺盐颗粒、 4%螺威粉剂 （TDS） 和50%氯硝柳胺乙醇胺盐可湿性粉剂 （WPN） 3种灭螺药 物枯水期在湖沼地区采用不同方法的现场灭螺效果， 为选择安全、 高效的灭螺药物和方法提供依据。 方法 方法 选择钉螺密 度较高的有螺环境， 将3种灭螺药物分别按5%杀螺胺乙醇胺盐颗粒30 g/m2 、 TDS 6 g/m2 、 WPN 2 g/m2 的浓度， 采用喷洒法和 撒粉法灭螺， 比较3种灭螺药物施药后3、 7、 15 d的灭螺效果。结果 结果 施药后15 d ，3种药物采用喷洒法灭螺的钉螺校正死 亡率分别为79.00%、 82.29%、 84.83%， 采用撒粉法的钉螺校正死亡率分别为97.42%、 95.27%、 96.62%， 撒粉法效果优于喷洒 法。结论 结论 撒粉法较喷洒法灭螺效果好， 该方法可在湖沼地区秋季退水后推广应用。

关键词: 钉螺； 5%杀螺胺乙醇胺盐颗粒剂； 4%螺威粉剂； 50%氯硝柳胺乙醇胺盐可湿性粉剂； 灭螺效果； 湖沼型地区