氯硝柳胺悬浮剂浸杀钉螺螺卵和幼螺效果的研究

目的了解氯硝柳胺悬浮剂(SCN)杀灭钉螺螺卵、幼螺等不同生长发育阶段的效果。方法分别称取SCN和氯硝柳胺乙醇胺盐可湿性粉剂(WPN),采用实验室螺卵、幼螺浸杀法,并比较两者对杀灭螺卵和幼螺的不同效果。结果SCN0.25mg/L浸杀螺卵24h,螺卵死亡率为100%;WPN0.50mg/L浸杀24h,螺卵死亡率为100%。SCN浸杀螺卵24、48、72h的LC50值分别为0.0506、0.0496、0.0473mg/L;WPN浸杀螺卵24、48、72h的LC50值分别为0.1030、0.0962、0.0869mg/L。SCN和WPN0.25mg/L浸杀幼螺死亡率均为100%;SCN浸杀幼螺24、48、72h的LC50值分别为0.0625、0.0474、0.0442mg/L;WPN浸杀幼螺24、48、72h的LC50值分别为0.1088、0.0825、0.0825mg/L。结论氯硝柳胺悬浮剂对钉螺螺卵、幼螺均具有较好的杀灭作用。

Molluscicidal effect of suspension concentrate of niclosamide against Oncomelania snail eggs and young snails

Objective To observe the molluscicidal effect of 25% suspension concentrate of niclosamide (SCN) against snail eggs and young snails. Methods The experiments with SCN and 50% wettable powder of niclosamide ethanolamide salt (WPN) against the snail eggs and young snails were carried out by the immersion method in laboratory. Results The death rates of snail eggs were both 100% in 0.25 mg/L active content of SCN and in 0.50 mg/L of WPN for 24 hours. The LC_~50(s) of SCN against Oncomelania snail eggs were 0.0506, 0.0496 mg/L and 0.0473 mg/L by immersion for 24, 48 hours and 72 hours respectively, while the LC_~50(s) of WPN were 0.1030, ~0.0962 mg/L and 0.0869 mg/L. The death rates of young snails were both 100% in 0.25 mg/L active content of SCN and WPN for 24 hours. The LC_~50(s) of SCN were 0.0625, 0.0474 mg/L and ~0.0442 mg/L for 24, 48 hours and 72 hours respectively, while the LC_~50(s) of WPN were 0.1088, 0.0825 ~mg/L and 0.0825 mg/L. Conclusion The SCN has high molluscicidal effect against Oncomelania snail in its different developmental stages: egg and young snail.