吡虫啉对家蚕的毒性

吡虫啉对蚕的毒性试验表明 :4龄起蚕致死中浓度 (LC50 )为 2 71mg/L ,致死中量 (LD50 )为0 0 3 4 μg/头。 4龄起蚕连续添食吡虫啉水溶液试验表明 :0 0 0 71mg/mL( 1 4× 1 0 4 倍稀释液 )浓度吡虫啉连续添毒对蚕有明显的毒性 ,茧的经济性状也有显著地下降。 0 0 1 2 5mg/mL( 8× 1 0 4 倍稀释液 )吡虫啉连续添毒 1 2h的蚕 ,上蔟率为 86%,死笼茧率为 3 9%,鲜茧茧层率为 2 1 2 %,比对照区低 0 3 %,而持续添毒则表现为全部死亡。此外 ,吡虫啉对家蚕具有触杀和熏蒸毒性

Toxicity of Imidacloprid to Silkworm

The tests of toxicity of imidacloprid to silkworm larvae showed that 50% lethal concentration(LC 50 ) was 2.71 mg/L and 50% lethal dose(LD 50 ) was 0.034μg/larval of 4th newly exuviated larvae.The experiment of continual imidacloprid administration indicated:continual feeding with 0.0071mg/mL (14×10 4 times diluted aqueous) showed clear toxicity and there was marked decline in economic character of cocoon.Continual feeding with 0.0125 mg/mL (8×10 4 times diluted aqueous) for 12 hours,the cocooning ratio was 86%,ratio of dead worm in cocoon was 3.9%, and ratio of fresh cocoon shell was 21 2% which is 0.3% low than the control plot.But all the silkworm larvae died in continual imidacloprid feeding plot.In addition, it has toxicity of contact and fumingation to silkworm larvae.