摘要
通过对菜粉蝶的人工饲养，测定各龄期在甘蓝上的取食量，累计取食量，观察其生物学特性，结果显示其取食量从１—５龄逐步递增，在菜青虫卵孵化后８天左右，累计取食量进入激增，１５天左右达到高逢。此为制订菜青虫化防适期提供科学依据。
Pieris rapae were cultured with cabbage leaves at the laboratory.Leaf area consumed at each instar throughout the larva stage were measured and cumulative amount were calculated.Meanwhile,the biological characteristics were observed.The results showed that the leaf area consumed increased in coresponding with the larva growth.The daily amount of leaf area consumed increased sharply in the 8th day after hatching and reached the peak in the 15th day.The optimal time for controlling the pest were discussed.
基金
山西省归国留学人员科研基金
