【摘要】 目的评价氯硝柳胺悬浮剂(SCN)在江滩地区连续应用的灭螺效果,为江滩地区长期应用SCN灭螺提供依据。方法选择江苏省扬中市有螺江滩作为灭螺现场,每年按SCN总剂量6~8g/m2进行喷洒灭螺,并对螺情进行调查,考核连续4年应用SCN的灭螺效果。结果2004~2007年江滩灭螺前活螺平均密度分别为6.00、4.25、2.04只/0.1m2和1.95只/0.1m2;灭螺后活螺平均密度分别为0.86、0.86、0.23只/0.1m2和0.16只/0.1m2;灭螺后活螺密度逐年下降,2004~2007年活螺密度下降率分别为85.67%、79.76%、88.49%和91.78%。2007年灭螺后较2004年灭螺前活螺框出现率由73.46%降为9.66%,下降了86.85%;活螺平均密度由6.00只/0.1m2降为0.16只/0.1m2,下降了97.33%。结论经过连续4年使用SCN喷洒灭螺,钉螺密度显著下降,灭螺效果稳定可靠。SCN适用于江滩地区长期大规模灭螺。更多还原

【Abstract】 Objective To evaluate the long-term molluscicidal effect of suspension concentrate of niclosamide (SCN) spraying in marshland regions of the Yangtze River. Methods A marshland with Oncomelania snails in Yangzhong City, Jiangsu Province, was selected as the study spot, and a dose of 6-8 g/m2 of SCN was sprayed yearly for four successive years, and the status of snails was investigated. Results From 2004 to 2007, the average densities of living snails were 6.00, 4.25, 2.04, 1.95 snails/0.1 m2, respectively before the use of molluscicide, and 0.86, 0.86, 0.23, 0.16 snails/0.1 m2, respectively after that. The average densities of living snails before and after the use of molluscicide reduced year by year, and the reduction rates of average densities of living snails were 85.67%, 79.76%, 88.49% and 91.78%, respectively from 2004 to 2007. The rate of frames with snails after the use of molluscicide was 73.46% in 2007, with a reduction rate of 86.85% compared with 9.66% of that before the use of molluscicide in 2004, and the average density of living snails reduced from 6.00 snails/0.1 m2 to 0.16 snails/0.1 m2, with a reduction rate of 97.33%. Conclusions After the spraying for four successive years, the density of snails reduces significantly and the molluscicidal effect is stable and reliable. SCN is a formulation of molluscicide for long-term application in marshland regions.更多还原