60%四聚乙醛水分散粒剂杀螺效果评价

目的 评价60%四聚乙醛水分散粒剂的室内和现场杀螺效果。方法 按照《农药登记用杀钉螺剂药效试验方法和评价》(NY/ T 1617-2008)要求,采用60%四聚乙醛水分散粒剂(MWG)室内和现场喷洒法灭螺,并与50%氯硝柳胺乙醇胺盐可湿性粉剂(WPN)进行效果比较。结果 使用60%四聚乙醛水分散粒剂室内喷洒法灭螺,1、3 和7 d LC50 值分别为0. 312(0. 271~0. 360)、0. 216(0. 190~0. 245)和0. 177(0. 160~0. 196)g/ m² ,0. 900 g/ m² 浓度7 d 后实验室钉螺死亡率为98. 00%。使用0. 900 g/ m² 浓度现场喷洒7 d,岳阳草洲和江陵县河滩现场钉螺死亡率分别为90. 91%和85. 12%。与50%氯硝柳胺乙醇胺盐可湿性粉剂对照组(1. 000 g/ m² )相比,岳阳草洲现场0. 900、1.800 g/ m² MWG 组钉螺死亡率差异均无统计学意义(χ² = 2. 555、3. 340,P 均>0. 05);江陵县河滩现场1. 800 g/m² MWG 组钉螺死亡率差异无统计学意义(χ² =0. 989,P>0. 05)。结论60%四聚乙醛水分散粒剂室内和现场喷洒试 验使用0. 900 g/ m² 浓度,其药效均达到《农药登记用杀钉螺剂药效试验方法和评价》(NY/ T 1617-2008)规定的登记标准,具有较好的实验室和现场杀螺效果,为新型高效、使用方便的灭螺药物剂型。

Evaluation on the molluscicidal effect of 60% metaldehyde water dispersible granules

Objective To evaluate the molluscicidal effect of 60% metaldehyde water dispersible granules(MWG) against Oncomelania hupensis snails in laboratory and field settings. Methods By the standard procedures specified in Efficacy Test Methods and Evaluation of Molluscicide for Pesticide Registration(NY / T 1617-2008), we conducted the experiment in both laboratory and field setting using MWG against the snails via immersing and spraying methods. Then the mulluscicidal effect was compared with that of 50% wettable powder of niclosamide ethanolamine salt ( WPN ). Results In the laboratory, LC50(s) at 1, 3 and 7 d was 0. 312(0. 271~0. 360), 0. 216(0. 190~0. 245)and 0. 177(0. 160~0. 196) g /m² , respectively, by MWG immersing. The mortality rate of snails was 98. 00% by spraying MWG for 7 days in dose 0. 900 g / m² in the laboratory setting, and respectively 90. 91% and 85. 12% by the identical protocol applied to the field settings at grass beaches and flood plains in Yueyang and Jiangling County. The difference was insignificant for the mortality rate of snails when comparing the dosage of 50% WPN (1. 000 g / m² ) with that of 60% MWG (0. 900 g / m² and 1. 800 g / m² administered at the grass beaches in Yueyang County, χ² = 2. 555, 3. 340; P > 0. 05, respectively) and (1. 800 g / m² administered at the flood plains in Jiangling County (χ² =0. 989, P>0. 05). Conclusion Spraying 60% MWG in dose of 0.900 g / m² in both laboratory and field setting can lead to the requirements specified in Efficacy Test Methods and Evaluation of Molluscicide for Pesticide Registration, which suggests that this protocol may be a novel and potent molluscicide with easy performance.