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

Abstrct:The acute toxicities of 7 fungicides to silkworm were evaluated in laboratory by using the leaf dipping method.The results indicated that the LC50 values of 7 fungicides were 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.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.