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目的评价在有螺江滩、河道、渠道连续使用氯硝柳胺乙醇胺盐后的灭螺效果。方法选择丹阳市后巷镇北魏江滩、陵口镇肖梁河、云阳镇老庙渠道作为研究现场,采用4%氯硝柳胺乙醇胺盐粉剂50 g/m2和26%四聚杀螺胺(2~4)g/m2实施灭螺。综合利用历史资料和现场调查资料,评价连续应用灭螺药物后的效果。结果至2013年,北魏江滩、肖梁河、老庙渠道钉螺面积较首次复现时分别下降了82.80%、63.14%和70.00%,钉螺面积与钉螺密度均呈显著正相关(r=0.931、0.975、0.916,P均<0.05);灭螺后活螺平均密度较首次复现时下降了92.34%、87.91%和97.66%。灭螺后钉螺校正死亡率与次年活螺平均密度均呈负相关(r=-0.998、-0.999、-0.970);活螺密度下降率与次年活螺平均密度均呈负相关(r=-0.997、-0.998、-0.868)。结论药物灭螺在压缩钉螺面积、降低钉螺密度、控制血吸虫病传播等方面效果明显。
Objective To evaluate the effect of snail control after the continuous use of niclosamide ethanolamine salt in Youlugan Beach, the river channel and the canal. Methods The northern Weijiang Beach in Houxiang Town of Danyang City, Xiao Lianghe River in Yunkou Town and Lao Temple Channel in Yunyang Town were selected as the research site, and 4% niclosamide ethanolamine salt powder 50 g / m2 and 26% tetramethoxamide (2 ~ 4) g / m2 to kill the snail. Comprehensive utilization of historical data and field survey data to evaluate the effect of continuous application of snail drugs. Results By 2013, the area of Oncomelania snails was reduced by 82.80%, 63.14% and 70.00% respectively in the Beiwei riverbank, Xiao Lianghe and LaoMiao channels compared with that of the first recurrence. The snail area and snail density had a significant positive correlation (r = 0.931,0.975 , 0.916, P <0.05). The average density of live snails decreased by 92.34%, 87.91% and 97.66% compared with the first reproduction. The corrected mortality of snails after the snail killing was negatively correlated with the mean density of live snails in the next year (r = -0.998, -0.999, -0.970). The degeneration rate of live snails was negatively correlated with the average density of live snails in the following year (r = -0.997, -0.998, -0.868). Conclusion The results showed that the drug snail-killing was effective in compressing the area of snail, reducing the density of snail and controlling the spread of schistosomiasis.