小桐子种子提取物对小菜蛾、家蝇杀虫活性初探

以乙醇、正丁醇、乙酸乙酯、氯仿和石油醚为溶剂对小桐子种子进行粗取，并采用常规方法对小菜蛾和家蝇进行杀虫活性测定。结果显示，种子的5种溶剂提取物对2种试虫的杀虫活性均较强，其中对小菜蛾的触杀活性以乙酸乙酯提取物最高，48h校正死亡率达93．6％，最低的石油醚为78．9％；乙醇提取物对家蝇的胃毒效果最强，48h校正死亡率达100％，石油醚最低，为58．3％。

Insecticidal activity of Jatropha curcas seed extracts against Plutella xylostella and Musca domestica

Crude extracts from seeds of Jatropha curcas L. were obtained with ethanol, butanol, ethyl acetate, chloroform and petroleum ether by using the impregnation method, and the toxicity of each crude extract against two pest insects, Plutella xylostella and Musca domestica, was determined by the tag method and the stomach poison method, seperately. The results show that the five extracts of seeds all demonstrated high activities against these two pest insects. Of the five extracts the ethyl acetate extract showed the best insecticidal effect on P. xylostella when treated at the rate of 50 g ·L-1 P. xylostella had a corrected mortality of 93.6% when treated with the ethyl acetate extract for 48 h but had the lowest corrected mortality （78.9%） when treated with petroleum ether extract. M. domestica had the highest corrected mortality （100%） when exposed to the ethanol extract （ 10 g · L-1 ） for 48h, but had the lowest corrected mortality （58.3%） when treated with the petroleum ether extract.