螺威与杀螺胺现场杀螺效果比较

目的 目的 比较螺威 （TDS） 和四聚?杀螺胺 （MNSC） 的现场杀螺效果。方法 方法 选择有钉螺孳生的小型有螺沟渠环境为 试区， 分别采用浸杀法和喷洒法对TDS和MNSC的杀螺效果进行评价。TDS和MNSC浸杀试验浓度分别为2.5 g/m3 和2ml/m3 ， 喷洒试验剂量分别为3 g/m2 和2 ml/m2 ； 设50%氯硝柳胺乙醇胺盐可湿性粉剂 （WPN） 为对照组， 浸杀浓度和喷洒剂量为2 g/ m3 和2 ml/m2 。结果 结果 TDS浸杀24 h钉螺死亡率为90.70%， 喷洒7 d 死亡率为81.40%， 各观察时点杀螺效果差异均无统计 学意义 （P均＞0.05）。喷洒后1 d ， TDS组钉螺死亡率低于MNSC组 （P＜0.01）， 喷洒3 d后两组死亡率相近 （P＞0.05）。MN? SC浸杀24 h钉螺死亡率为99.17%， 喷洒1 d 为66.07%；WPN浸杀24 h钉螺死亡率为97.51%， 喷洒1 d 为71.43%， 两者差异 均无统计学意义 （P均＞0.05）。结论 结论 TDS具有良好的杀螺活性和药效稳定性， 现场杀螺效果与MNSC相近， 但杀螺敏感 性低于MNSC。

Molluscicidal effect comparison between TDS and MNSC in field

Objective To compare the molluscicidal effects between“Luo-wei”（TDS）,a plant molluscicide in 4 percent, and metaldehyde and niclosamide（MNSC）in the field. Methods A natural ecological environment with Oncomelania hupensis was selected as the test area,the test concentrations of TDS and MNSC were 2.5 g/m3 and 2 ml/m3 respectively by the immersion method;the test doses of TDS and MNSC were 3 g/m2 and 2 ml/m2 respectively by the spray method;the doses of WPN in a control group were 2 g/m3 and 2 g/m2 respectively by the two methods above-mentioned. The molluscicidal effects between TDS and MNSC were compared by using the synchronous design method and parallel comparative method. Results In the TDS group,the death rate of snails was 90.70%by immersion for 24 hours,reached to 81.40%after spraying for 7 days,and there were no significant differences among the observation time points in molluscicidal effects（P＆gt;0.05）. One day after the spraying,the death rate of snails was less in the TDS group compared with that in the MSCN group（P＆lt;0.01）,but the death rates of snails were similar in both groups 3 days after the spraying（P＆gt;0.05）. In the MSCN group,the death rate of snails was 99.17%by immersion for 24 hours,reached to 66.07% by spraying for 1 day. In the WPS group,the death rate of snails was 97.15% by immersion for 24 hours,reached to 71.43%after spraying for 1 day,and there were no significant differences（both P＆gt;0.05）. Conclusion TDS has a good molluscicidal activity and stable efficacy,and the molluscicidal effect of TDS is similar to that of MSCN in the filed, but the molluscicidal sensitivity of TDS is lower than that of MSCN.