关键词: 稻瘟灵, 乐果, 蝌蚪, 急性毒性, 中华蟾蜍

Abstract: [Objective] The aim of this research was to study the toxic effect of isoprothiolane and dimethoate on Bufo gargarizans tadpoles and provide the scientific basis for pesticides in the water environmental monitoring.[Method] An acute toxicity method of aquatic biology was used to evaluate the acute toxicity effects of isoprothiolane and dimethoate on tadpoles of Bufo gargarizans.[Results] The results showed that the LC₅₀ of isoprothiolane at 24,48,72 and 96 to tadpoles of Bufo gargarizans were 27.885,25.181,23.366 and 22.551 mg/L,respectively,and the safe concentration (SC) was 6.283 mg/L;the LC₅₀ of dimethoate at 24,48,72 and 96 h to tadpoles of Bufo gargarizans were 52.321,38.998,29.319 and 24.115 mg/L,respectively,and the safe concentration (SC) was 6.500 mg/L.[Conclusion] Both of isoprothiolane and dimethoate are low toxicity for the tadpoles of Bufo gargarizans and this research will provides a reference to the rational usage of these two pesticides.

Key words: isoprothiolane, dimethoate, tadpole, acute toxicity, Bufo gargarizans