菜粉蝶picris rapae(L.)是十字花科蔬菜最重要的害虫之一。在我国南方,夏季炎热、高温干旱,不利于菜粉蝶生长发育。多年观察说明,我地6至8月即3至5代发生期间,菜粉蝶多转移到阴凉的杂草上产卵、繁殖,以度过南方炎热的夏季。而造成生产上严重损失的时期则是在夏前。本文讨论了夏前菜粉蝶在甘蓝上的种群特点,并运用微机对有关气象因子进行程序分析,以明确夏前菜粉蝶的发生规律。 材料和方法 1.种群消长调查 在所内设0.2亩观察圃一块,种植甘蓝等蔬菜,不施农药。从越冬代成虫开始产卵调查起,每5天1次,直至菜粉蝶度 Cabbage butterfly picris rapae (L.) is one of the most important pests of cruciferous vegetables. In southern China, summer hot, hot and humid, is not conducive to the growth and development of cabbage butterfly. Years of observation shows that from June to August that is 3 to 5 generations occurred, the cabbage butterfly transfer more to cool weeds on the spawning, breeding, to spend the hot summer in the South. The period leading to serious losses in production was in the summer. This paper discussed the characteristics of the population of Cabbage butterfly on cabbage and analyzed the related meteorological factors by computer to identify the regularity of cabbage butterfly in summer. Materials and methods 1. Population growth and decline survey Set up a 0.2-acre observation garden, planting cabbage and other vegetables, not pesticides. From the overwintering adult oviposition began to investigate, every 5 days 1, until the cabbage butterfly