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用叶碟法和食料混药法就瑞香狼毒 Stellera chamaejasme L .根乙醇提取物 (简称 SCEE)对菜粉蝶等多种昆虫的生物活性进行了测定 .SCEE对菜粉蝶 5龄幼虫的胃毒作用 48h的 L D5 0 为 1 2 .32 μg/头 ;当 SCEE质量浓度分别为 5 ,1 0 ,5 0 ,2 .5 m g/ m L时 ,7d后菜粉蝶幼虫、亚洲玉米螟幼虫、斜纹夜蛾幼虫、小菜蛾幼虫的校正死亡率分别为 1 0 0 % ,6 5 .5 2 % ,1 6 .6 7%和 31 .0 3% ;SCEE对桃蚜 48h的 L C5 0 值为 0 .5 992 m g/ m L,表明 SCEE对菜粉蝶幼虫、亚洲玉米螟幼虫、桃蚜具有很强的生物活性 ;而 SCEE对斜纹夜蛾幼虫、小菜蛾幼虫的生物活性弱
The bioactivity of many insects such as cabbage butterfly (Stellera chamaejasme L.) was detected by the leaf disc method and the foodstuff mixed herb method.The effect of SCEE on the stomach toxicity of the 5th instar larvae of Pieris rapae L D5 0 at 48h was 122.32 μg / head. When the SCEE concentration was 5, 10, 50 and 2.5 mg / m L, the larvae of P. furnacalis, The corrected mortalities of moth larvae and diamondback moth larvae were 100%, 65.52%, 16.76% and 31.0%, respectively. 5 992 mg / m L, indicating that SCEE has strong biological activity on the cabbage butterfly larvae, the Asian corn borer larvae and Myzus persicae; while the biological activity of SCEE against the Spodoptera litura larvae and the diamondback moth larvae is weak