[Effect and cost-effectiveness of three commonly used molluscicides in largescale field application].

Objective: To evaluate the effect and cost-effectiveness of three commonly used molluscicides, 4% "Luo-wei" (tea-seed distilled saponins, TDS), 50% niclosamide ethanolamine salt wettable powder (NESWP), and 26% metaldehyde and niclosamide suspension concentrate (MNSC) in large-scale field application, so as to provide the references for formulating the strategy of snail control.

Methods: The field test and parallel comparison were implemented. A marshland with snails of the Yangtze River was divided into 4 parts (10 hm) for the research, and three of them were experimental areas while the last one was a blank control area.

An integrated environmental improvement of marshlands: impact on control and elimination of schistosomiasis in marshland regions along the Yangtze River, China.

Background: Schistosomiasis is a global snail-transmitted infectious disease of poverty. Transmission control had been achieved in China in 2015 after the control efforts for over 60 years. Currently, the remaining core regions endemic for Schistosoma japonicum are mainly located in the marshland and lake regions along the Yangtze River basin.

[Improvement of root parameters in land surface model (LSM )and its effect on the simulated results].

In order to improve root parameterization in land surface model, the sub-model for root in CERES-Maize was coupled in the SSiB2 after calibrating of maize parameters in SSiB2. The effects of two improved root parameterization schemes on simulated results of land surface flux were analyzed. Results indicated that simulation accuracy of land surface flux was enhanced when the root module provided root depth only with the SSiB2 model (scheme I).

[Correlation between schistosomiasis endemic situation and Oncomelania snail status in Yizheng City, Jiangsu province from 2002 to 2011].

Objective: To understand the correlation between schistosomiasis endemic situation and Oncomelania snail status, and discuss the control strategy and measures.

Methods: With a retrospective research method, the data were collected and analyzed including the snail area, infected snail area, snail density, density of infected snails, the infection rate of snails, the positive rates of blood tests and stool examinations for schistosomiasis in residents and domestic animals, and the incidence of acute schistosome infection in Yizheng City from 2002 to 2011. The correlation between the infected snails and schistosomiasis was analyzed.

[Effect of water conservancy schistosomiasis control projects in rivers and estuaries connecting with the Yangtze River on Oncomelania snail control].

Objective: To evaluate the effect of the water conservancy schistosomiasis control projects in rivers and estuaries connecting with the Yangtze River on Oncomelania snail control.

Methods: Three water conservancy schistosomiasis control projects of Laobianmin River, Panjia River and Bianmin River were chosen for the objects of the study. The concrete slope protection and the overflow dam, the concrete slope protection and the check sluice, and the simple concrete slope protection were built respectively in above mentioned three rivers.