Toxicity of Six Insecticides toSilkworm and Their Safety Evaluation

Toxicity of six insecticides to silkworm was evaluated in laboratory. Carbosulfan and methomyl showed high stomach toxicity and moderate contact toxicity. Cypermethrin, fenvalerate,fipronil and abamectin had high stomach and contact toxicity,but slight fumigation toxicity. The toxic ratio of six insecticides to silkworm was below 0.5 in leaf dipping method, indicated a very high toxicity.The use of these insecticides in the mulberry field or nearby were strictly forbidden.