博落回提取物对菜粉蝶幼虫的拒食活性

[目的]测定博落回提取物对菜粉蝶5龄幼虫的拒食活性。[方法]采用叶碟法，分别就博落回植物不同部位对菜粉蝶5龄幼虫的拒食活性进行了测定。[结果]当菜粉蝶5龄幼虫取食用0．400％的博落回整株植物的乙醇提取物处理过的叶碟24和48h后的选择性拒食率分别为87．50％和89．56％。当菜粉蝶5龄幼虫分别取食用1．000％的博落回植物根、茎、叶乙醇提取物处理过的叶碟后，24h的非选择性拒食率分别为91．78％、91．01％、90．63％，48h的拒食率分别为89．33％、88．91％、86．76％。[结论]博落回植物提取物对菜粉蝶5龄幼虫有很强的拒食活性。

Antifeedant Bioactivity of Extract from Macleya cordata against the Larvae of Pieris rapae

[Objective] The aim of the research was to determin the bioactivity of antifeedant of extract of Macleya cordata against the 5th instar larvae of Pieris rapae.[Method] Using leaf-disc method,the antifeedant bioactivities of ethanol extract from the plant Macleya cordata against the 5th instar larvae of insect Pieris rapae was determined resp.[Result] The 5th instar larvae of the insect Pieris rapae was feed the leaf disc treated with 0.400% ethanol extracts from the plant Macleya cordata,The selective antif...