Abstract: Objective To valuate the mollusicidal effects of some plants cultivated in the hilly and mountainous areas on On? comelania hupensis and screen the plants against O. hupensis snails. Methods The mollusicidal effects of water extracts of plant materials were tested in laboratory. Result The LC50 of all the species in 24 h，48 h，and 120 h reached the middle noxious level against O. hupensis snails. According to the taxis of LC50 （s）in 120 h，Eucalyptus camaldulensis was best with a LC50 of 0.013%， and Ailanthus altissima，Zanthoxylum bungeanum，Juglans regia，Melia azedarach，Nerium indicum，Pterocarva stenobtera，Cin? namomum camphora，Vetiveria zizanioides，and Citrus reticulata were the second with LC50 （s）between 0.020% and 0.370%，and Zingiber officinale had a lower effect on snail control with a LC50 of above 0.500%. There was a correlation between the death rate of snails and soak time. Conclusion The resources of snail?restrained plants are very abundant，and four plants，such as Euca? lyptus camaldulensis， Ailanthus altissima，Cinnamomum camphora，and Vetiveria zizanioides have some mollusicidal effect.

Key words: Oncomelania hupensis；Hilly and mountainous area；Plant；Mollusicidal effect；Forestry ecological program of snail control and schistosomiasis prevention

摘要：

目的 评估山丘型血吸虫病流行区血防林建设中所栽植物的抑螺效果， 筛选适合于该类地区的灭螺植物。方法 采用植物材料水浸物作室内浸泡法杀螺试验。 结果 所试验的13种植物材料浸泡钉螺24、 48、 120 h的LC50值均达到对钉螺的中等毒性水平。依照综合排序， 桉树叶灭螺效果最好， 120 h LC50为0.013%， 其次是臭椿叶、 花椒叶、 核桃叶、 苦楝叶、 香根草叶、 夹竹桃叶、 枫杨叶、 香樟叶、 柑橘叶皮， LC50 为0.020%～0.370%， 生姜枝和叶LC50＞0.500%。钉螺死亡率与浸泡时间存在线性相关关系。 结论 在山丘型钉螺分布地区， 抑螺植物资源丰富， 其中桉树叶、 臭椿叶和香根草叶均有较好的杀螺作用。

关键词: 钉螺； 山丘地区； 植物； 杀螺效果； 林业血防