塑料薄膜覆盖法现场灭螺效果

目的 目的 观察塑料薄膜 （塑膜） 覆盖法的灭螺效果。方法 方法 在钉螺孳生的荒地设单纯覆膜、 覆膜辅助碳铵、 覆膜辅助杀螺胺3组； 沟渠设单纯覆膜、 覆膜辅助碳铵2组， 人工除障。每组设4个投螺点， 每点投放钉螺100只， 再将塑膜均匀覆盖封闭试区。分别于灭螺后3、 7、 15 d和30 d观察钉螺死亡情况。结果 结果 荒地单纯覆膜组灭螺后15 d钉螺死亡率为20.77%， 30 d达96.92%； 覆膜辅助杀螺胺组灭螺后3 d钉螺死亡率为80.46%。灭螺后30 d各组钉螺死亡率为96.92%～100%。结论 结论 塑膜覆盖法具有一定的杀螺效果， 可在丘陵亚型、 水网型血吸虫病流行地区合理选用。

Molluscicidal effect of plastic film mulch covering method

Objective To evaluate the molluscicidal effect of the plastic film mulch covering method. Methods In the bar?ren land with a lot of Oncomelania hupensis snails，3 experimental groups were set up，in which respectively using 3 differentmethods：a simple plastic film mulch covering method，film assisted with ammonium bicarbonate，and film assisted with aminemolluscicide. In the canals，two experimental groups were set up，in which respectively using 2 different methods：simple plasticfilm mulch covering method and film assisted with ammonium bicarbonate. In above?mentioned areas，obstacles were cleared artifi?cially. In each experiment group，4 observation spots were set up，and 100 living snails were pot in each spot，and then，the plas?tic film mulch was evenly covered. The status of the snails was observed 3，7，15 and 30 days after the intervention. Results Inthe barren land，the snail death rates of the simple plastic film group were 20.77% and 96.92% 15 days and 30 days after the inter?vention，respectively. The snail death rate of the film assisted with amine molluscicide group was 80.46% 3 days after the interven?tion. In all the experiment groups，the snail death rates were from 96.92 to 100% 30 days after the intervention. Conclusion Theplastic film mulch covering method has a great molluscicide effect in the hill subtype and water network type of schistosomiasis epi?demic areas.