Molluscicidal effect of Rongbao in Mianyang City

Objective To evaluate the molluscicidal effect of Rongbao in schistosomiasis endemic areas in Mianyang City.Methods Three Oncomelania hupensis snail habitats with the similar snail status were selected and sprayed with Rongbao,niclosamide,and fresh water,respectively. Then the snail status in the three fields was surveyed before the spraying and 7,15,30and 60 days after the spraying,and the molluscicidal effects of different molluscicides were compared. Results The reducing rates of densities of living snails in the field sprayed with Rongbao were 94.4%,95.9%,98.2% and 98.8%,7,15,30 and 60days after the spraying,respectively. The reducing rates of the densities of living snails in the other field sprayed with niclosamide were 94.0%,94.0%,89.9% and 92.2% in above-mentioned days,respectively. In the 30 days and 60 days after the spraying,the reducing rates of densities of living snails in the field sprayed with Rongbao were significantly higher than those sprayed with niclosamide(χ230d=8.18,χ260d=3.97,Both P0.05). Conclusion The short-term molluscicidal effect of Rongbao is similar to thatofniclosamide,butthe long-term effect of Rongbao isbetter than that ofniclosamide.