土埋氯硝柳胺缓释法在高原山区的灭螺效果

Molluscicidal effect of buried niclosamide sustained-release method in plateau mountainous areas

目的观察土埋氯硝柳胺缓释法在云南山区梯田环境的灭螺效果。方法在云南山区选择一块梯田,分隔后随机分成A、B、C、D 4组,其中A、B、C 3组为实验组,D组为对照组。实验组分别按剂量6、12、24 g/m2实施土埋氯硝柳胺缓释法灭螺,对照组50%氯硝柳胺乙醇胺盐可湿性粉剂2 g/m2喷洒灭螺。结果施药6个月和1年后活螺平均密度下降率、土埋氯硝柳胺缓释法24 g/m2组分别为89.90%和96.80%,对照组为40.35%和59.11%,两者差异有统计学意义(χ20.5年=151.24,χ21年=117.14,P均<0.01)。结论土埋氯硝柳胺缓释法灭螺效果较好,适用于缺水的山区梯田等环境灭螺。

Objective To evaluate the molluscicidal effect of the buried niclosamide sustained-release method in Oncomela- nia snail-infested terraced environments of mountainous areas in Yunnan Province. Methods A piece of relatively isolated snail- infested terraced environment was selected as experimental plot and randomly divided into four groups. The buried niclosamide sus- tained-release methods were performed in Group A, B, C with the doses of 6 g/m2, 12 g/m2, 24 g/m2 respectively, and Group D was sprayed with 50% niclosamide ethanolamine salt wettable powder （2 g/mE） as the control. Results In Group C （with the bur- ied niclosamide sustained-release method of 24 g/mS）, the half-year reduction of living snail density was 89.90%, and one-year re- duction of living snail density was 96.80%, which were significantly higher than those of Group D （40.35% and 59.11% ） （Both P 〈 0.01 ） Conclusion The buried niclosamide sustained-release method is effective and suitable for snail control in mountainous terrace areas.