坡柳种子提取物对小菜蛾的拒食活性

测定坡柳(Dodonaea viscose (L.) Jacq.)种子石油醚、氯仿、乙酸乙酯和乙醇提取物对小菜蛾Plutella xylostella (L.)的生物活性。结果表明:它们对小菜蛾均有较高的拒食活性,乙醇提取物的拒食活性明显高于其他提取物。4种提取物对小菜蛾的毒力顺序为:乙醇提取物>乙酸乙酯提取物>氯仿提取物>石油醚提取物。坡柳种子乙醇提取物对小菜蛾24h,48h非选择性拒食的AFC50值分别为321.19mg·L-1,650.27mg·L-1;而24h,48h选择性拒食的AFC50值分别为1 808.62和2813.34mg·L-1。

Antifeeding activities of Dodonaea viscose seed extracts against Plutella xylostella

Antifeeding activities of extracts of Dodonaea viscose(L.)Jacq seeds against Plutella xylostella(L.) were bioassayed.Petroleum,chloroform,ethyl acetate,and ethanol were used as extraction solvents.All four extracts had high antifeeding effect against the 3th instar larvae.The activity of the ethanol extract was significantly higher than that of other extracts.The relative activity of the four extracts was ethanol>ethyl acetate > chloroform>petroleum.The AFC_50 of the ethanol extract was 321.19 mg·L-1 in 24 hours and 650.27 mg·L-1 and in 48 hours in no choice,and 1 808.62 mg5L-1 in 24 hours and 2 813.34 mg·L-1 in 48 hours in choice test.