“螺威”植物杀螺剂现场灭螺效果研究与示范Ⅲ山丘地区喷洒灭螺效果

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/m2TDS和2 g/m250%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。

Field evaluation of a novel plant molluscicide Luo-wei against the snail On- comelania hupensis III Molluscicidal effect by spraying method in hilly regions

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 Oncornelania 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 etharlolamine salt （WPN） at a dose of 2 g/m2 at different time after spraying. Results Afterl, 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 l, 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.