【摘要】 羊角扭的果、叶、茎粗提物对菜粉蝶幼虫具有较好的拒食作用和毒杀作用，从羊角扭植物中分离出来的羊角扭总甙对菜粉蝶４龄幼虫的ＬＣ_５０和ＬＣ_５０分别为３２．０４６ ８ ｍｇ／Ｌ和３７９.７１８　１ ｍｇ／Ｌ．田间试验表明，■＝０．０５％羊角扭甙水剂防治菜粉蝶效果好．更多还原

【Abstract】 s: Results of experiments in laboratory indicated that the extracts of fruits, leaves and stems from Strophanthus divaricatus possessing strong antifeedant and insecticidal properties on the 4th instar larvae of the imported cabbage worm Pieris rapae. It was found that the LC50 and LC95 of D-strophanthin isolated from Strophanthus divaricatus were 32.046 8 mg/L and 379. 718 1 mg/L respectively, against 4th instar larvae of Pieris rapae. Results in field trials showed that the good effectiveness was obtained with 0. 05% commercial products of Strophanthus divericatus against imported cabbage worm.更多还原