Jia Tie-Wu, Sun Le-Ping, Hong Qing-Biao, Tao Bo, Cai Jian-Xin, Li Yue-Sheng, Lin Dan-Dan, Yu Xin-Lin, Zhou Xiao-Nong
National Institute of Parasitic Diseases, Chinese Center for Disease Control and Prevention, WHO Collaborating Centre for Malaria, Schistosomiasis and Filariasis, Shanghai 200025, China.
Zhongguo Xue Xi Chong Bing Fang Zhi Za Zhi. 2013 Apr;25(2):125-8.
To evaluate the field effect of a novel plant molluscicide "Luo-wei" (Tea-seed distilled saponins, TDS) against Oncomelania hupensis in the lake and marshland regions.
A spraying experiment was carried out in the grassland of two schistosomiasis endemic counties, including Xingzi in Jiangxi Province and the Huarong in Hunan Province, to assess the molluscicidal effect of 4% TDS comparing with 50% wettable powder of niclosamide ethanolamine salt (WPN). The chi2 test was used to examine the differences between regions, molluscicides, or days after spraying.
Following 1, 3, 7, and 15 days of test, the snail mortality showed a simultaneous increase both in TDS group (70.43%-86.88%) and WPN group (70.21%-85.35%). There is no significant difference between TDS and WPN of day 1, 7 and 15 (all P values > 0.05), but except for day 3 (chi2 = 3.910, P = 0.048). By the end of day 15, the snail mortality for TDS was 86.53% in Xingzi and 88.28% in Huarong, while for WPN was 83.04% in Xingzi and 93.69% in Huarong respectively; the decline rate of snail density for TDS was 85.29% in Xingzi and 93.53% in Huarong, while for WPN was 85.29% in Xingzi and 93.53% in Huarong respectively. The adjusted mortality of different days ranged from 69.63% to 86.54% in the the TDS group, and 69.41% to 86.54% in the WPN group.
The molluscicidal effect of TDS by spraying is similar to that of WPN. It is time to popularize this new plant molluscicide (TDS) in a wider field.
评估新型植物杀螺剂“螺威”（茶籽蒸馏皂甙，TDS）在湖沼地区对钉螺的现场防治效果。
在江西省星子县和湖南省华容县这两个血吸虫病流行县的草地开展喷洒试验，以4% TDS与50%氯硝柳胺乙醇胺盐可湿性粉剂（WPN）作对比，评估杀螺效果。采用卡方检验分析地区、杀螺剂或喷洒后天数之间的差异。
试验1、3、7和15天后，TDS组（70.43%-86.88%）和WPN组（70.21%-85.35%）的钉螺死亡率均同步上升。第1、7和15天，TDS与WPN之间无显著差异（所有P值>0.05），但第3天除外（卡方=3.910，P=0.048）。至第15天结束时，星子县TDS的钉螺死亡率为86.53%，华容县为88.28%；WPN在星子县为83.04%，华容县为93.69%。星子县TDS的钉螺密度下降率为85.29%，华容县为93.53%；WPN在星子县和华容县均为85.29%和93.53%。TDS组不同天数的校正死亡率为69.63%至86.54%，WPN组为69.41%至86.54%。
喷洒TDS的杀螺效果与WPN相似。该新型植物杀螺剂（TDS）值得在更广泛领域推广应用。
