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目的评价10%氯代水杨胺可湿性粉剂(LDS)在我国主要血吸虫病疫区现场杀灭湖北钉螺效果。方法在云南、四川、湖南、湖北、江西、安徽、江苏、浙江等8省选择有螺环境,开展LDS现场浸杀、喷洒和喷粉灭螺试验。现场浸杀法:将LDS配成有效含量分别为0.1、0.2、0.4、0.6、0.8、1.0 g/m36个浓度组,同时设50%氯硝柳胺乙醇胺盐(WPN)有效含量为1.0 g/m3对照组和空白对照组(清水),分别观察LDS现场浸杀湖北钉螺24、48、72 h灭螺效果;现场喷洒法和喷粉法:将LDS配成有效剂量分别为0.2、0.4、0.6、0.8、1.0 g/m25个浓度组,同时设1.0 g/m2WPN对照组和空白对照组(清水),分别观察LDS现场喷洒及喷粉后1、3、7 d的灭螺效果。结果 0.1 g/m3LDS在四川、江西、江苏、浙江,0.2 g/m3LDS在云南、湖南、湖北,0.4 g/m3LDS在安徽现场浸杀钉螺72 h,钉螺死亡率均>95%;0.2 g/m2LDS在湖南、湖北、江西、浙江,0.4 g/m2LDS在四川、安徽,0.6 g/m2LDS在云南、江苏现场喷洒后7 d,钉螺死亡率均>85%;0.6 g/m2LDS在云南、四川、湖北、江西、安徽、江苏、浙江7省现场喷粉后7 d,钉螺死亡率均>85%。按照《农药登记用杀钉螺剂药效试验方法和评价》(NY/T 1617-2008)中的标准,LDS为合格灭螺药。结论 LDS现场浸杀、喷洒或喷粉均有较好的杀螺效果,适用于我国血吸虫病流行区各种有螺环境灭螺。现场使用推荐剂量:浸杀法为0.1~0.2 g/m3,喷洒法为0.2~0.4 g/m2,喷粉法为0.4~0.6 g/m2。
Objective To evaluate the efficacy of 10% chlorinated salicylol wettable powder (LDS) in killing snails on the spot in the major schistosomiasis endemic areas in China. Methods The snail environment was selected in 8 provinces including Yunnan, Sichuan, Hunan, Hubei, Jiangxi, Anhui, Jiangsu and Zhejiang provinces to carry out the field immersion, spraying and snail-misting test on LDS site. On-the-spot immersion method: the effective content of LDS was 0.1,0.2,0.4,0.6,0.8,1.0 g / m36 concentration group, and the effective content of 50% niclosamide ethanolamine salt (WPN) was 1.0 g / m3 control group and blank control group (clean water), respectively, observed LDS snails immersed in Hubei snails 24,48,72 h oncomelania effects; spray-on-site and law: the effective dose of LDS dosing were 0.2,0.4,0.6 , 0.8,1.0 g / m25 concentration group, at the same time set 1.0 g / m2WPN control group and blank control group (clear water), respectively, LDS spot spraying and spraying 1,3,7 d after the snail effect. Results 0.1 g / m3 LDS was soaked in 0.4 g / m3 LDS in Sichuan, Jiangxi, Jiangsu and Zhejiang provinces for 0.2 h in Yunnan, Hunan and Hubei for 72 h. The mortality of snail was> 95% In South China, Hubei, Jiangxi and Zhejiang, 0.4 g / m2 LDS was in the Anhui Province and 0.6 g / m2 LDS in Yunnan and Jiangsu Province, respectively. In Jiangxi, Anhui, Jiangsu and Zhejiang provinces, the mortality of Oncomelania snails was over 85% on the 7th day after dusting on site. LDS is a qualified molluscicide according to the standards in “Test Methods and Evaluation of Efficacy of Insecticides for Spiking with Pesticides” (NY / T 1617-2008). Conclusion LDS on-site immersion, spraying or dusting has a better snail effect for a variety of endemic areas of schistosomiasis snail control snail. Recommended dosage for field use: 0.1 to 0.2 g / m3 for dip method, 0.2 to 0.4 g / m2 for spray method and 0.4 to 0.6 g / m2 for dusting method.