碳酰胺现场扩大灭螺试验研究

目的验证碳酰胺在山丘地区现场灭螺效果,为推广应用提供依据。方法选择山丘地区有螺苗木田和水沟为灭螺试验现场,设碳酰胺40g/m2试验组、氯硝柳胺2g/m2组和空白对照组,采用铲草皮土埋加药杀的改良灭螺法,通过春秋两季2轮灭螺,次年春季考核灭螺效果。结果灭螺前碳酰胺组的有螺框出现率、活螺平均密度和有螺面积分别为59.27%、5.66只/0.1m2和20630m2,灭螺1年后分别为0.44%、0.005只/0.1m2和280m2,与灭螺前和空白对照组比较差异均有统计学意义（P〈0.01）,与氯硝柳胺组之间差异无统计学意义（P〉0.05）。结论在经处理后较干燥的环境条件下,碳酰胺40g/m2剂量有较好的杀灭钉螺效果,具有推广应用价值。

Expanded experiment on the on-site molluscicidal effect of carbamide

Objective To verify the on-site molluscicidal activity of carbamide in hilly areas,providing the basis for promotion of this agent.Methods The experiment was performed in hilly areas invested with seedling fields and ditches using a 40 g/m2 carbamide group,a 2 g/m2 niclosamide group and a control group.Molluscicides were applied with turfs shoveled and buried in soil in spring and autumn,and the effect was evaluated in the next spring.Results The presence rate,average density and area of live snails were 59.27%,5.66/0.1 m2 and 20 630 m2 in the carbaimide group before application of molluscicides,and became 0.44%,0.005/0.1 m2 and 280 m2 one year after snail control,which was statistically different from the results before molluscicidal use and the control group（P0.01）,but not different from the niclosamide group（P0.05）.Conclusion Under pretreated dry environmental conditions,carbamide of 40 g/m2 has satisfactory molluscicidal effects and is worth promoting.