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目的观察50%氯硝柳胺乙醇胺盐可湿性粉剂(WPN)和26%四聚杀螺胺悬浮剂(MNSC)杀灭椎实螺效果。方法将WPN和MNSC分别配制成有效成分浓度为0.06、0.13、0.25、0.50、1.00、2.00 mg/L和4.00 mg/L的溶液,在实验室浸泡椎实螺成螺,统计椎实螺死亡率并计算半数致死浓度(LC50值)。采用有效成分浓度分别为0.03、0.06、0.13、0.25、0.50、1.00g/m2和2.00 g/m2的WPN和MNSC开展室内喷洒杀灭椎实螺试验,统计椎实螺死亡率并计算计算LC50值。分别配制WPN和MNSC有效成分浓度为1.00、0.50、0.25、0.13 mg/L的溶液,分组投放椎实螺,观察不同时间椎实螺上爬情况。结果 WPN浸杀48 h和72 h的LC50值分别为0.93 mg/L和0.64 mg/L,MNSC浸杀48 h和72 h的LC50值分别为0.74 mg/L和0.51 mg/L;WPN和MNSC有效成分浓度>1.00 g/m2时,喷洒3 d后椎实螺死亡率均达100%;在有效成分浓度为1.00 mg/L的WPN和MNSC药液中,未见椎实螺上爬,但在低浓度药液中有少量椎实螺上爬。结论 WPN和MNSC均有杀灭椎实螺效果,且均可抑制椎实螺上爬。现场开展杀灭椎实螺工作时,浸杀法应采用WPN和MNSC有效成分浓度2.00 mg/L浸杀48 h以上为宜,喷洒法应采用有效成分含量1.00 g/m2喷洒3 d为宜。
Objective To observe the effect of 50% niclosamide ethanolamine salt wettable powder (WPN) and 26% tetramethasone spirulina suspension (MNSC) Methods WPN and MNSC were respectively formulated into solutions with active ingredient concentrations of 0.06, 0.13, 0.25, 0.50, 1.00, 2.00 mg / L and 4.00 mg / L, And calculate the lethal concentration (LC50 value). Spraying Solid Spirulina by Indoor Spraying WPN and MNSC with active ingredient concentrations of 0.03, 0.06, 0.13, 0.25, 0.50, 1.00 g / m2 and 2.00 g / m2 respectively, the mortality of spines was calculated and the LC50 value was calculated . The solutions of active ingredients of WPN and MNSC were prepared at 1.00, 0.50, 0.25 and 0.13 mg / L, respectively. Results LC50 values of 0.93 mg / L and 0.64 mg / L at 48 h and 72 h after WPN immersion were 0.74 mg / L and 0.51 mg / L respectively at 48 h and 72 h after MNSC immersion. WPN and MNSC When the active ingredient concentration was> 1.00 g / m2, the death rate of Conus vertebrate reached 100% after spraying for 3 d. No climbing was found in WPN and MNSC with the effective concentration of 1.00 mg / L In a low concentration of liquid medicine in a small amount of spinella climbing. Conclusion Both WPN and MNSC have the effect of killing spines, and all of them can inhibit the climbing of spines. On-site to kill the spinella solid snail work, immersion method should be used WPN and MNSC active ingredient concentration of 2.00 mg / L immersion 48 h above is appropriate, the spraying method should be used active ingredient content of 1.00 g / m2 spraying 3 d appropriate.