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Experiment on Acute Toxicity of 10 Commonly Used Pesticides to Silkworms at Different Ages

XIE Daoyan,TIAN Jinmei,CHAI Jianping,LIU Yongguang,NI Jing,JIANG Xiujun,LUO Yanjie(Sericulture and Bees Institute,Yunnan Academy of Agriculture,Mengzi Yunnan 661101,China)  
Adopting toxic leaf feeding method(impregnation),the acute toxicity test was carried out indoors on 10 commonly used pesticides to 2to 5-instar silkworms.The results showed that 2-4-instar silkworms were more sensitive to 5-instar ones,among which the 2-instar silkworm were the most sensitive;the mortality of 12hafter fed toxic leaves was higher than that of 24h;for different pesticides,the toxic symptoms for 2-5-instar silkworms were similar.
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