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目的 验证硼镁石粉杀灭山区钉螺的效果及其对鱼类的毒性。方法 喷洒杀螺试验:硼镁石粉80、200g/m2、氯硝柳胺2g/m2组和清水对照组进行比较。鱼毒试验:硼镁石粉1000mg/L、氯硝柳胺2mg/L组和清水对照组进行比较。结果 喷洒杀螺试验:硼镁石粉80、200g/m2组施药后30d有螺框出现率、活螺平均密度明显下降,与清水对照组比较差异有非常显著性(P<0.01),与氯硝柳胺组比较差异无显著性(P>0.05)。硼镁石粉80、200g/m2组与氯硝柳胺组钉螺死亡率分别达到95.37％、93.66％和96.74％;与对照组比较,差异有非常显著性(P<0.01);硼镁石粉80、200g/m2组与氯硝柳胺组之间差异有显著性(P<0.05)。说明硼镁石粉具有较好的杀螺效果,但不及氯硝柳胺。鱼毒试验;硼镁石粉1000mg/L大剂量环境下,未见鱼死亡,初步提示该药对鱼类低毒。结论 硼镁石粉适合山区和水产养殖区灭螺。
Objective To verify the efficacy of boric acid to kill snails in mountainous areas and their toxicity to fish. Methods Spraying snail test: borosilicate powder 80,200g / m2, niclosamide 2g / m2 group and water control group were compared. Fish poisoning test: Magnesite powder 1000mg / L, niclosamide 2mg / L group and water control group were compared. Results Sparging snails test showed that the average density of live snails was significantly decreased 30 days after the application of borosite powder 80 and 200 g / m2, respectively. The average density of live snails was significantly lower than that of the control group (P <0.01) There was no significant difference in the niclosamide group (P> 0.05). The death rates of snail in the group of 80, 200g / m2 of magnesia powder and niclosamide reached 95.37%, 93.66% and 96.74%, respectively. The difference was significant (P <0.01) The difference between 200g / m2 group and niclosamide group was significant (P <0.05). That borosilicate powder has a better snail effect, but less than niclosamide. Fish poisoning test; Magnesium phosphate powder 1000mg / L high-dose environment, no fish died, suggesting that the drug has low toxicity to fish. Conclusion Magnesite powder is suitable for snail killing in mountainous areas and aquaculture areas.