Abstract: Objective To evaluate the molluscicidal effect of a novel plant molluscicide“Luo?wei” （Tea?seed distilled sapo? nins，TDS）against Oncomelania hupensis in hilly regions. Methods The molluscicidal effect of TDS at a dose of 5 g/m2 by the spraying method against Oncomelania snails was assessed in a setting with a high snail density in Hushan Village，Jiangning Dis? trict of Nanjing City，and the effect was compared with that of 50% wettable powder of niclosamide ethanolamine salt（WPN）at a dose of 2 g/m2 at different time after spraying. Results After1，3，7 and 15 day（days）of the spraying experiment，the snail death rates of the TDS group were 56.47%，57.32% ，90.58% and 93.41% respectively，while those of the WPN group were 49.22%，53.37%，95.92% and 97.26%，respectively. The differences between the rates of the 2 groups 1，7，15 day（days）after the spraying were statistically significant（all P＜0.05） . Fifteen days after the spraying，the density of living snails reduced from 20.30±16.20 snails/0.1 m2 and 23.67±21.22 snails/0.1 m2 to 2.28±2.17 snails/0.1 m2 and 1.27±0.76 snails/0.1 m2 in the TDS group and WPN group，respectively，with the reduction rates of 88.77% and 94.63%，respectively. Conclusion TDS can be used as an alternative molluscicide for the control of Oncomelania snails in hilly areas，which deserves further popularization.

Key words: Oncomelania hupensis；Tea?seed distilled saponins（TDS）；Niclosamide ethanolamine salt（WPN）；Plant mol? luscicide；Molluscicidal effect

摘要： 目的 目的 评价植物杀螺剂4%螺威 （TDS） 在山丘地区现场灭螺效果， 为现场应用提供科学依据。方法 方法 在南京市江 宁区湖山村选择钉螺密度相对较高的环境， 采用5 g/m2 TDS和2 g/m2 50%氯硝柳胺乙醇胺盐 （WPN） 进行喷洒灭螺试验， 比 较不同时间不同药物的现场灭螺效果。结果 结果 灭螺后1、 3、 7、 15 d TDS组钉螺死亡率为56.47%、 57.32%和90.58%、 93.41%， WPN组钉螺死亡率为49.22%、 53.37%、 95.92%和97.26%， 灭螺后1、 7 d和15 d两组钉螺死亡率之间差异有统计学 意义 （P均＜0.05）； 灭螺后15 d， TDS组和WPN组活螺密度分别由20.30±16.20只/0.1 m2 和23.67±21.22只/0.1 m2 下降至 2.28±2.17只/0.1 m2 和1.27±0.76只/0.1 m2 ， 钉螺密度下降率分别为88.77%和94.63%。结论 结论 TDS可作为山丘地区的备选灭 螺药物之一， 值得进一步推广应用。

关键词: 钉螺； 螺威； 氯硝柳胺； 植物杀螺剂； 灭螺效果