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就瑞香狼毒根乙醇提取物 (简称SCEE)对菜粉蝶、桃蚜和亚洲玉米螟的生物活性进行了测定。当试虫为菜粉蝶五龄幼虫时 ,采用夹毒法测定 ,SCEE处理 2天后胃毒作用的LD 5 2为每头 12 .32og;采用叶蝶法测定 ,当SCEE浓度分别为 5mg·mL-1时 ,处理 7天后其校正死亡率为 10 0 % ;采用叶碟法测定 ,SCEE对其AFC50 为 0 .3813mg·mL-1。当试虫为桃蚜时 ,采用浸叶法测定 ,SCEE处理 2天后 ,其LD50 值为0 .5 92 2mg·mL-1。当试虫为亚洲玉米螟三龄幼虫时 ,采用食料混药法测定 ,SCEE处理 7天和 14天后 ,其校正死亡率分别为 6 5 .5 2 %和 85 .5 2 %。以上结果表明 ,SCEE对菜粉蝶幼虫、桃蚜和亚洲玉米螟幼虫具有很强的杀虫活性。
The bioactivities of Brassica campestris, Myzus persicae and Asiatic corn borer were determined on Stellera chamaejasme ethanol extract (SCEE). When the test insects for the fifth instar larvae of Pieris rapae, measured by the pinch poisoning, 2 days after SCEE treatment of gastric toxicity of LD 5 2 per head 12.32og; butterfly test method, when the SCEE concentrations were 5mg · mL- 1, the corrected mortality rate was 10% after 7 days of treatment. The AFC50 of SCEE was 0.3813 mg · mL-1 by leaf disk method. When the test pest was peach aphid, the leaf dipping method was used. After 2 days SCEE treatment, the LD50 was 0.9292 mg · mL-1. When the test insects as the third instar larvae of the Asian corn borer, the use of foodstuff mixed drug test, SCEE treatment 7 days and 14 days, the corrected mortality was 65.52% and 85.52%. The above results show that SCEE has strong insecticidal activity against the larvae of Chinese cabbage butterfly larvae, Myzus persicae and Asian corn borer.