苦槛蓝抽提物对菜青虫生物活性的影响

报道了苦槛蓝油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、茎浸提物对菜粉蝶３龄幼虫的非选择性拒食率均在９０％以上，对４龄和５龄幼虫的拒依率分别为８０％￣８６％和４６％￣６５％．Ｐｏｔｔｅｒ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

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

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%.