7种杀菌剂对家蚕的急性毒性评价

Toxicity and Toxicity Evaluation of Seven fungicides to Bombyx mori and Observation of Toxicity Symptoms

采用浸叶法测定了嘧菌酯、戊菌唑、苯醚甲环唑、氟硅唑、氟环唑、醚菌酯、己唑醇对家蚕的毒力,并观察了家蚕的中毒症状。结果表明:7种药剂对2龄家蚕96 h的LC50值分别为:883.79 mg/L,8.4 mg/L,6.68 mg/L,39.43 mg/L,297.62 mg/L,165.11 mg/L,708.76 mg/L;嘧菌酯对家蚕的毒性最低,戊菌唑对家蚕毒性最高。对其毒性大小分级:戊菌唑、苯醚甲环唑为高毒,氟硅唑、醚菌酯为中毒,嘧菌酯、己唑醇、氟环唑为低毒。得出结论:戊菌唑、苯醚甲环唑等不适合用在桑树及附近使用。

The acute toxicities of 7 fungicides to silkworm were evaluated in laboratory by using the leaf dipping method. The results indicated that the LCso values of 7 fungicides were 883.79 mg/L, 8.4 mg/L, 6.68 mg/L, 39.43 rag/L, 297.62 rag/L, 165.11 rag/L, 708.76 mg/L. According to the grade compartmentalization of pesticide toxicity, Penconazole and Difenoconazole were high toxicity grade, Flusilazole and Kresoxim-methyl were middle toxicity grade, Azoxystrobin, Hexaconazole and Epoxiconazole were low toxicity grade. It suggested that Penconazole and Difenoconazole should not be used in mulberry field and near mulberry garden for their high toxicities.