【摘要】 报道了非洲山毛豆 (TephrosiavogeliiHook)丙酮提取物对菜青虫 (PierisrapaeL .)、斜纹夜蛾 (SpodopteralituraFabricius)、粘虫 (MythimnaseparataWalker)、小菜蛾 (PlutellaxylostellaL .)等害虫的拒食作用 选择性拒食作用中 ,非洲山毛豆叶丙酮提取物以植物干粉 0 2g/mL处理时 ,对 5龄菜青虫的拒食率为 87 3 % ,与 10 0 0mg/L川楝素达到同一水平 对 5龄斜纹夜蛾和粘虫的拒食率分别为 6 5 8%和 10 0 % ,粘虫对提取物的反应更敏感 ,以植物干粉0 0 0 5g/mL处理时 ,拒食率仍达到 6 0 5 % 非选择性拒食作用中 ,非洲山毛豆叶丙酮提取物植物干粉 0 0 1g/mL处理时 ,对 5龄菜青虫 48h的拒食率高达 94 2 % ;植物干粉 0 1g/mL处理时 ,对 4龄小菜蛾的拒食率为 10 0 % ,显示出强烈的拒食作用更多还原

【Abstract】 The antifeeding activity of the acetone extracts from Tephrosia vogelii Hook against four species of Lepidoptera: Pieris rapae L., Spodoptera litura Fabricius, Mythimna separata Walker, Plutella xylostella L. was evaluated in both choice and no choice bioassays. In choice bioassays the 5 times dilution of the extracts caused feeding reduction of 87.3% against the fifth instar larvae of Pieris rapae L., reaching the same antifeeding levels as toosendanin (1 000 mg/L). This dilution had an antifeeding rate 65.8% and 100.0% against the fifth instar larvae of Spodoptera litura F. and Mythimna separata W. respectively, and it still caused feeding reduction of 60.5% when diluted 200 times. In no choice bioassays the 100 times dilution of the extracts had a high antifeeding rate up to 94.2% against the fifth instar larvae of Pieris rapae L. within 48 hours. The 10 times dilution showed strong antifeeding activity against the fourth instar larvae of Plutella xylostella L., inducing feeding reduction of 100%.更多还原