鸦胆子提取物对菜青虫幼虫取食和生长发育的影响

测定了鸦胆子沉淀部分（Ⅰ）、氯仿、乙酸乙酯、正丁醇和水抽提物对荣青虫4龄幼虫的拒食、抑制生长发育和毒杀活性。结果表明，在10mg／ml浓度下，处理24h，除了水提取物活性较低外，沉淀部分（Ⅰ）、氯仿、乙酸乙酯、正丁醇抽提物对菜青虫4龄幼虫的拒食率和生长抑制率均在80％以上。处理48h，除鸦胆子氯仿抽提物对菜青虫4龄幼虫的拒食活性仍然保持高活性，拒食率达95．50％外，沉淀部分（Ⅰ）、乙酸乙酯、正丁醇抽提物活性的拒食率和生长抑制率有所降低，均在60％-75％之间。处理5d后，氯仿和乙酸乙酯抽提物的幼虫死亡率均为100％，化蛹率均为0，而水提取物与对照一样。

Effect of Brucea javanica extracts on feeding and growth and development of Pieris rapae Larvae

Antifeeding, inhibition of growth and development, and insecticidal toxicity on 4th instar larvae of Pierisrapae were determined for precipitate fraction 1, chloroform, ethylacetate, n-butyl alcohol, and water extracts ofBrucea javanica. Treatment for 24 h with a 10 mg/ml concentration provided >80% antifeeding and growth inhibitionfor fraction 1, chloroform, ethylacetate, and n-butyl alcohol extracts, with the water extract showing the lowestbiological activity. After 48 h of treatment, the chloroform extract provided a strong antifeeding activity of 95.50%,while antifeeding and growth inhibition activity of the other extracts were reduced and were between 60 and 75%. After5 d of treatment, the larval death rate and pupation rate of the chloroform and ethylacetate extracts were 100 and 0%,respectively, while larval death rate and pupation rate of the water extracts were equivalent to the untreated check.