Abstract: Objective To evaluate the short?term effect of the black film covering combined with niclosamide on Oncomela? nia hupensis snail control in marshland and lake regions. Methods A ditch with snails in Anxiang County was selected as the ex? perimental sites. The ditch was divided into 3 groups：a film group，a niclosamide group，and a niclosamide and film group. The snails were surveyed before the test and 1，3，5，7 days after the experiment. Results After the film covering，the highest tem? perature of the surface of soil was 63.7 ℃ on the first day，and the temperature higher than 40 ℃ lasted 4.34 hours. On the second day，the highest temperature was 52.3 ℃，and the temperature higher than 40 ℃ lasted 4.96 hours. On the fourth day and fifth day，the temperature was lower than 30 ℃，while the temperature was lower than 34 ℃ on the sixth day. On the seventh day of the experiment，the snail death rates of the film group，the niclosamide group，and the niclosamide and film group on the soil surface were 16.36%，58.40% and 53.57%，respectively. On the seventh day，the snail death rates of the film group，and the niclosamide and film group under the soil were 20.00% and 40.00%，respectively，while no snails were found under the soil in the niclosamide group 3 days after the experiment. In mesh bags，the snail death rates of the film group，the niclosamide group，and the ni? closamide and film group were 84.00%，95.33% and 95.33%，respectively. Conclusion The short?term effect of the black film covering on snail control is not obvious， and the black film covering does no promote the molluscicidal effect of niclosamide.

Key words: Schistosomiasis；Oncomelania hupensis；Black film；Snail control；Niclosamide；Death rate；Marshland and lake region

摘要： 目的 目的 观察黑色地膜覆盖灭螺及其与氯硝柳胺联合灭螺的近期效果。方法 方法 在安乡县选取一条钉螺密度较高、 钉螺分布比较均匀的沟渠， 依次设为薄膜组、 氯硝柳胺组和氯硝柳胺薄膜组进行试验。于试验开始前和开始后第1、 2、 3、 5、 7 d进行查螺， 鉴定钉螺死亡情况， 并对各数据进行统计分析。结果 结果 地膜覆盖后第1 d土表温度最高达到63.7 ℃， 40 ℃ 以上的温度维持了4.34 h， 第2 d薄膜下土表温度最高为52.3 ℃， 40 ℃以上的温度维持了4.96 h， 试验第4、 5 d薄膜下土表温 度都低于30 ℃， 第6 d薄膜下最高温度没有超过34 ℃。试验后第7 d， 薄膜组、 氯硝柳胺组和氯硝柳胺薄膜组土壤表层钉螺 死亡率分别为16.36%、 58.40%和53.57%； 薄膜组和氯硝柳胺薄膜组土壤下层钉螺死亡率分别为20.00%和40.00%， 氯硝柳 胺组第3 d后在土壤下层未查到钉螺； 薄膜组、 氯硝柳胺组和氯硝柳胺薄膜组袋装钉螺第7 d的死亡率分别为84.00%、 95.33%和95.33%。结论 结论 本次试验未观察到黑色地膜覆盖对钉螺有明显的近期灭螺效果， 也未观察到地膜覆盖对氯硝柳 胺灭螺有明显的促进作用。

关键词: 血吸虫病； 钉螺； 黑色地膜； 灭螺； 氯硝柳胺； 死亡率； 湖沼型地区