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以菜青虫为研究对象,利用95%乙醇溶剂萃取臭椿叶中有效成分,测定了不同浓度的臭椿叶乙醇提取物对菜青虫生物活性的影响。结果表明:臭椿叶乙醇提取物对菜青虫具有明显的拒食和生长抑制作用,毒杀作用较好,且呈现出良好的剂量效应和时间效应。处理后24、48h的半致死浓度(LC50)分别为20.14、14.22g·L~(-1),非选择拒食中浓度(AFC50)分别为13.73、8.45g·L~(-1),生长抑制中浓度分别为10.89、8.09g·L~(-1)。
Taking Pieris rapae as the research object, the effective components of Ailanthus altissima leaf were extracted with 95% ethanol solvent, and the effects of different concentrations of ethanol extracts of Ailanthus altnodus on the bioactivities of Pieris rapae were determined. The results showed that ethanol extract of Ailanthus altvanae had obvious antifeedant and growth inhibitory effects on Pieris rapae, with good toxicity and good dose effect and time effect. The LC50 values at 24 and 48 h after treatment were 20.14 and 14.22 g · L -1, respectively, and the AFC50 values were 13.73 and 8.45 g · L -1, respectively. The growth inhibition The median concentrations were 10.89,8.09g · L ~ (-1).