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Toxicological Evaluation of Seven Pesticides to Bombyx mori and Observation of Toxicosis Symptoms

WANG Jing1,ZHU Jiu-sheng1,2,GAO Hai-yan1,2,YU Qing-jun1,2,QIAO Xiong-wu1,1.Shanxi Key Laboratory of Pesticide Science,Shanxi Academy of Agricultural Sciences,Taiyuan 030031 2.College of Agriculture,Shanxi Agricultural University,Taigu 030801  
The acute toxicities of 7 pesticides to silkworm,Bombyx mori,were evaluated in laboratory by using the feed intake method.The toxic symptoms of silkworms after treatment of pesticides were systematically observed.The results indicated that the LC50 values of Lambda-cyhalothrin,Emamectin benzoate,Abamectin,Beta-cypermethrin were lower than 0.5mg·L-1,which belonged to extremely toxic substances.The LC50 values of Acetamiprid,Chlorpyrifos and Dichlorvos were 1.2371,1.0438 and 4.9641mg·L-1,which belonged to highly toxic substances.The general acute symptoms of poisoning due to pesticides treatment in silkworms are vomiting,food rejection,shorting of body,movements of the head,and stiffness of body in the shape of an "S"or "C",etc..However,different kinds of pesticides result in different symptoms in silkworm.
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