摘要
以大叶桃花心木的花和叶为材料,测试了其乙醇抽提物对重要多食性害虫斜纹夜蛾5龄幼虫的拒食活性。结果表明:试剂中大叶桃花心木的花与叶各自的抽提物质量分数5％时均有较强的拒食作用,非选择性拒食率分别高达96.33％和86.23％,选择性拒食率分别高达96.63％和91.98％;质量分数5％大叶桃花心木花、叶抽提物拒食率在48 h后均有所下降,但仍然保持较高的拒食率,其非选择性拒食率分别为87.3％和73.9％,选择性拒食率分别为95.46％和85.63％;连续以质量分数1％的花、叶抽提物浸叶饲喂时,试虫体重的增长明显低于对照试虫,处理后第5天,质量分数1％的花、叶抽提物处理试虫的平均体重分别为对照的49.32％和53.01％。研究结果表明,大叶桃花心木的花、叶的乙醇抽提物对斜纹夜蛾均具有良好的拒食活性,并且大叶桃花心木的花抽提物对斜纹夜蛾的拒食活性高于其叶的抽提物。
The anti -feeding activity of extracts partitioned with ethanol from flowers and leaves of Swietenia macrophylla against Spodoptera litura was tested. The result showed that the extracts had strong anti-feeding activities. In the non-selective test, these two extracts at the concentration of 50 g/kg showed very strong anti-feeding activities against 5th instar larvae and that their anti-feeding rates of 24 hours were 96.33 % and 86.23 % respectively. The selective test showed the anti -feeding rate increased to 96.63 %, 91.98 % respectively. The effect after 48 h was decreased in some degree but still kept as high as 87.3 % and 73.9 % respectively in the non-selective test and 95.46 % and 85.63 % respectively in the selective test. The high inhibition on the increase of larvae weight was obtained through feeding the 5th instar larvae with the two extracts at the concentration of 10 g/kg, and the larvae weights were 49.32 % and 53.01 % of their controls respectively. It is concluded that the two extracts had high anti-feeding activity and that the effect of the extract from flowers was higher than that from leaves.
出处
《热带作物学报》
CSCD
2004年第2期28-32,共5页
Chinese Journal of Tropical Crops
基金
海南省科技重点项目资助(项目编号:01203)
