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11种杀虫剂在引起中华草蛉 (Chrysopasinia (Jieder) )幼虫死亡率 30 %左右的选择压下 ,对其结茧和羽化都有不同程度的影响。硫丹在明显高于田间常用浓度的 1 4 3倍时 ,引起草蛉幼虫死亡率 2 3 3 % ,对该虫结茧率和羽化率影响不大 ,分别为 86 0 %和 83 0 % ;氰戊菊酯、甲丙硫磷、氧乐果、甲基对硫磷、辛硫磷、丙溴磷对幼虫结茧和羽化的影响相对较低 ,草蛉校正结茧率和羽化率为 77 5 %～ 93 7%和 61 0 %～ 74 8% ;甲基毒死稗、氯氟氰菊酯、灭多威对草蛉幼虫生命力的影响很大 ,尤其使成虫羽化率明显降低 ,且以灭多威的影响最甚 ,50mg/kg处理后幼虫结茧率仅 34 9% ,成虫羽化率为 1 2 4% ;抑太保虽然对草蛉幼虫的杀伤力小 ,对草蛉幼虫的结茧影响不大 ,但对成虫羽化影响很大 ,处理浓度为 50 0mg/kg时 ,幼虫结茧率为 84 8% ,成虫羽化率仅 1 3 5 %。
Eleven kinds of insecticides exerted a selective pressure of about 30% on the mortality of Chrysopsis (Jieder) larvae, affecting their cocooning and eclosion to varying degrees. When the endosulfan was significantly higher than 14 times of the commonly used concentration in the field, the death rate of larvae of larvae was 23.3%, which had little effect on the cocooning rate and emergence rate of the larvae, which were 86 0% and 83 0% respectively. Fenvalerate, metreate, omethoate, parathion-methyl, phoxim and profenofos have a relatively low effect on the cocoon formation and emergence of larvae, and the corrected cocooning and emergence rate of larvae were 77 5% -93 7% and 61 0% -74 8%. Methyl poisoning barnyard grass, cyhalothrin and methomyl had a great influence on the larvae ’s vitality, especially the emergence rate of adults The effect of methomyl was the strongest. The larval cocooning rate was only 34.9% after 50mg / kg treatment, and the emergence rate of adult was 12.4%. Although the lethality of Coptis against larvae was still low, But had a great influence on adult eclosion. When the treatment concentration was 50 mg / kg, the cocooning rate of larvae was 84.8%, and the emergence rate of adults was only 135%.