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铁刀木粉蝶(Catopsilia pomona Fabricius)是危害铁刀木(Cassia siamea)的主要食叶害虫,该虫的嗜食树种还有腊肠树(Cassia fistula)等。大发生时常吃尽树叶,严重影响林木的生长。1978—1979年,我所树木园的腊肠树因树叶反复被吃光而呈枯梢现象,而在苗圃附近的铁刀木与格木(Erythrophloeum,fordii)混交林,粉蝶产卵虽然也很多,但危害很轻。为了摸清其原因,1980年在粉蝶大发生初期,作者对此虫在两种不同生境中的种群数量变动,作了一个世代的系统观察,其结果报道如下:
Catopsilia pomona Fabricius is a major leaf-eating pest that damages Cassia siamea. There are also palmatos as Cassia fistula. The occurrence of large often leaves, seriously affecting the growth of trees. From 1978 to 1979, the sausage tree in our Arboretum was withered due to the leaves being eaten repeatedly, while in the mixed forest of Ertai wood and Erythrophloeum fordii near the nursery, But the harm is very light. In order to find out the reason, in 1980, at the beginning of the Butterfly Period, the author made a systematic observation of the changes in the population of the insect in two different habitats. The results are reported as follows: