苦槛蓝抽提物对菜青虫生物活性的影响  

Effects on the Bioactivity of the Extracts from Myoporum bontioides Against Imported Cabbage Worm (Pieris rapae)

作　　者：AliAl-Bashari 钟国华[1] 胡美英[1] 

机构地区：[1]华南农业大学昆虫毒理研究室,广州510642

出　　处：《华南农业大学学报》1999年第3期28-31,共4页Journal of South China Agricultural University

摘　　要：报道了苦槛蓝抽提物对菜粉蝶幼虫拒食、毒杀和影响生长发育作用的生物活性．试验表明，ρ＝10g／L的苦槛蓝叶、茎浸提物对莱粉蝶3龄幼虫的非选择性拒食率均在90％以上，对4龄和5龄幼虫的拒食率分别为80％～86％和46％～65％．Pottr喷雾处理72h后，ρ＝10g／L叶甲醇浸提物对3龄幼虫的校正死亡率可达86．1％，而ρ＝10g／L叶石油醚浸提物对4龄幼虫的校正死亡率则为88．5％．用苦槛蓝叶氯仿和甲醇萃取物处理4龄试虫72h后，LC50分别是ρ＝6．3g／L和13．9g／L．ρ＝10g／L苦槛蓝叶氯仿萃取物处理菜粉蝶5龄幼虫4d后，试虫平均体重为对照的38．05％，羽化率4．00％，发育抑制率达86．15％．The significant antifeeding action and poisoning of the extracts from Myoporum bontioides against Pieris rapae L. were reported in this paper. The antifeeding rate with 1% methanolic extract andpetroleum ether extract from leaves and stems were above 90% against 3rd instar lareae, and 80% ~86% and 46% ~ 65% against 4th and 5th instar larvae of the insect pest in no-choice tests, respectively. After treatment with methanolic extract and petroleum ether extract in 72h, 86. 1% and 88. 5% ofmertality were obtained, respectively. The LC50 of the extract partitioned with chloroform and methanolfrom methanol extract against 4th instar larvae were 0. 63% and 1. 39%, respectively. In four days aftertreatment, with 1% chloroform extract partitioned from methanol extract, the average weight of 5th instarlarvac was 38. 05% of that in control, and the emergence rate of adult was 4.00% and the rate of growthinhibition was 88. 89%.

关 键 词：苦槛蓝 抽提物 菜青虫 生物活性 

分 类 号：S482.39[农业科学—农药学]