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目的实验室与现场评价26%四聚.杀螺胺悬浮剂(MNSC)杀螺效果。方法采用浸杀法和喷洒法,评价实验室和现场不同时段施用MNSC对钉螺的杀灭效果,并设50%氯硝柳胺乙醇胺盐可湿性粉剂(WPN)和清水对照。结果室内浸杀:MNSC浸泡钉螺24 h半数致死浓度(LC50值)为0.058 3 mg/L,低于WPN的0.094 7 mg/L;2.0 mg/L和1.0mg/L MNSC溶液浸杀钉螺24、48 h和72 h,钉螺死亡率均为100%。室内喷洒:MNSC剂量>1.0 g/m2,3 d和7 d钉螺死亡率均>97%。现场浸杀:使用2 g/m3MNSC现场浸杀灭螺24、48 h和72 h钉螺死亡率,湖北、安徽2省分别为97.78%～100%和97.50%～100%,WPN则分别为98.89%～100%和97.56%～100%;江苏省则均为100%。现场喷洒:江苏、湖北省和安徽省喷洒MNSC后1、3 d和7 d,钉螺死亡率分别为83.12%～94.64%、67.81%～86.67%和72.80%～100%,使用WPN后钉螺死亡率分别为78.40%～86.11%、77.27%～87.50%和83.81%～98.51%;湖南省现场喷洒MN-SC和WPN后7 d,钉螺死亡率分别为94.94%和94.20%,喷洒后15 d,钉螺死亡率分别为86.67%和89.38%。结论无论在室内还是现场,MNSC浸泡和喷洒杀螺效果基本和WPN一致,均具有较好的杀螺效果,且MNSC在使用过程中水溶性好,分散快,使用方便,是一种值得推广的新型灭螺药。
Objectives Laboratory and field evaluation of 26% tetramethoxystrobin suspension (MNSC) snail effect. Methods The immersion method and spraying method were used to evaluate the killing effect of MNSC on snails in laboratory and field at different periods. The 50% niclosamide ethanolamine salt wettable powder (WPN) and water control were also used. Results Indoor dipping: the LC50 of 24 h in MNSC was 0.058 3 mg / L, which was lower than 0.094 7 mg / L of WPN. The snails were soaked with 2.0 mg / L and 1.0 mg / L MNSC solution 24, 48 h and 72 h, snail mortality were 100%. Indoor spray: MNSC dose> 1.0 g / m2, on the 3rd and 7th day, the death rates of snails were> 97%. On-site soaking: The mortality of snail was 24 hrs, 48 hrs and 72 hs after inoculation with 2 g / m 3 MNSC in the field. The two provinces of Hubei and Anhui were 97.78% -100% and 97.50% -100% respectively, WPN was 98.89% ~ 100% and 97.56% ~ 100%, while Jiangsu Province is 100%. On-site spraying: The mortality rates of Oncomelania snails from 83.12% to 94.64%, 67.81% -86.67% and 72.80% -100% on the 1st, 3rd, and 7th days after spraying MNSC in Jiangsu, Hubei and Anhui respectively. Were 78.40% -86.11%, 77.27% -87.50% and 83.81% -98.51% respectively. On the 7th day after spraying MN-SC and WPN in Hunan Province, the mortality of Oncomelania snails was 94.94% and 94.20%, respectively, Mortality rates were 86.67% and 89.38% respectively. Conclusions Both MNSC immersion and sprinkler control are basically the same as WPN, both in indoor and in the field, and have good effect of killing snails. MNSC is good in water solubility, quick dispersion and easy to use, which is worth popularizing New molybdenum.