[Molluscicidal effect of simple black film mulching in mountainous areas of Yunnan Province].

Objective: To evaluate the molluscicidal effect of black plastic mulching in mountainous areas of Yunnan Province.

Methods: In Leqiu Village, Nanjian County, Yunnan Province, the terraced fields with Oncomelania hupensis snails were divided into A, B, C, D, E groups, and of which, A, B, C, D groups, as the experimental groups, were administered with simple black plastic mulching for 30 days, 60 days, 90 days and 120 days respectively; Group E, as the control group, was administered with 50% niclosamide ethanolamine salt wettable powder spraying.

Results: In Group C and D (simple black film mulching for 90 days and 120 days), no snails were found after the administration, the average density of living snails decreased by 100%, and the cost of one year was similar to that of the control group.

[Investigation on infection sources of schistosomiasis in mountainous regions, Nanjian County, Yunnan Province].

Objective: To understand the types of schisotsome infection sources and their roles in schistosomiasis transmission in mountainous endemic regions in Yunnan Province, so as to provide the evidence for implementing the comprehensive control measures based on infection source control.

Methods: Two villages of typical mountainous regions in Nanjian County were chosen for field investigation. The Oncomelania hupensis snail status was surveyed by the methods of systematic and environmental sampling.

[Effect of snail control of niclosamide by soil mixing and spraying methods in high dam of terrace].

The snail control efffect of niclosamide by soil mixing and spraying method were compared, and the results showed that the effects of the two methods were similar. Though there was difficulties in getting soil and mixing durg with soil, and the cost was high, the effect of soil mixing method in some special environment such as stone ditches and terraces.

[Effect of comprehensive control project on schistosomiasis in Nanjian county].

The comprehensive control project for schistosomiasis was implemented in Nanjian County from 2004 to 2008. After the implementation of the control project, the infection rates of population and livestock decreased by 94.39% and 83.