植物提取物对菜青虫的拒食活性研究

测定了广西30科74种植物提取物对菜青虫4龄幼虫的拒食活性。结果表明,在10 m g/mL浓度下,处理24 h,拒食率在90%以上的有鸦胆子(果实)、番荔枝、灵香草和木防已等4种植物提取物;拒食率在80%~90%的有楝科一种A(学名待定)、海木、木花生、鸦胆子(枝叶)和毛鸦胆子(果实)等5种植物提取物;拒食率在70%~80%的有米仔兰、海南木和鱼藤等3种植物提取物;处理48 h,鸦胆子(果实)、番荔枝、灵香草和木防已等4种植物提取物仍然维持高拒食活性,拒食率在9 0%以上;拒食率在80%~90%仅有海木1种植物提取物;拒食率在70%~80%的有米仔兰、楝科一种A(学名待定)、鸦胆子(枝叶)和毛鸦胆子(果实)等4种植物提取物;其余的供试植物提取物24 h和48 h的拒食率均在70%以下。

Antifeeding activity of some plant extracts against the larvae of Pieris rapae

Extracts from 74 plant species were tested for the antifeeding activities against the 4th inster larvae of Pieris rapae.The results showed that after 24h treated with 10mg/mL concentration,extracts from Brucea javanica(fruit),Annona squamosa,Lysimachia foenum-graecum and Cicculus trilobus possessed over 90% antifeeding activities;A species of Meliaceae,Heynea trijuga,Jatropha curcas,Brucea javanica(leaf) and Brucea mollis(fruit) possessed 80%~90%;Aglaia odorata,Dysoxylum hainanense and Derris trifoliate possessed 70%~80%. After 48 h treated,extracts from Brucea javanica(fruit),Annona squamosa,Lysimachia foenum-graecum and Cicculus trilobus kept more intensive antifeeding activity(over 90%),only Heynea trijuga possessed80%~90%,a species of Meliaceae,Brucea javanica(leaf) and Brucea mollis(fruit) possessed 70%~80%.The other extracts of plant species possessed under 70% antifeeding activities after 24 h and 48 h treated.