亚致死浓度农药对草间钻头蛛生长发育的影响

在室内用两种方法饲喂草间钻头蛛，研究了乐果、溴氰菊酯和氰戊菊酯3种农药对其发育历期和体重的影响。结果表明：以乐果和氰戊菊酯环境染毒法饲喂草间钻头蛛，其雌蛛体重较对照显著下降。以溴氰菊酯毒饵法饲喂草间钻头蛛，其雄蛛体重较对照显著下降。环境染毒法饲喂草间钻头蛛，3种农药对雄蛛体重影响不显著。与对照相比，3种农药饲喂的若蛛在三龄历期上无显著差异，但在四龄和五龄上存在显著差异。总效应是农药延长草间钻头蛛若蛛的发育历期，阻滞个体发育，导致体重下降。

The Influence of Sublethal Dose of Insecticides on Development of Hylyphantes graminicola

Influence of three insecticides on weight and development duration of the spider Hylyphantes graminicola(Sundevall) was investigated by two feeding methods in laboratory.Results showed that weight of the female spider decreased more significantly when they were fed on dimethoate and fenvalerate using touching-poison method than that of the control.And,the weight of the male decreased more significantly when they were fed on deltamethrin by feeding-poison method than that of the control.The above three insecticides did not significantly influence weight of the male spider when applied by touching-poison method.The 3rd instar did not,while the 4th and 5th instars did,differ in durations from those of the control when fed on three insecticides.Generally,the insecticides prolonged and retarded development of H.graminicola,and resulted in a decrease in weight.