菜粉蝶也称菜白蝶,是大同市十字花科蔬菜的主要害虫之一。我们于1979—1982年对其发生规律与防治措施进行了研究。一、生活习性以蛹在菜田附近土墙、树干、土缝、杂草及残株落叶间越冬,喜向阳干燥但阳光不直接照射的环境。越冬场所不同,越冬蛹羽化先后参差不齐,这是世代重叠的一个重要原因。成虫白天在露水干后开始活动,在菜田里飞翔,取食花蜜,晴朗无风阳光充足时活动最盛。晚上栖息在生长较茂密的植物上,交尾2—3天后开始产卵。成虫对芥子油趋性甚强,喜在甘蓝上产卵,距蜜源近的田边着卵量高。每停1次产卵1粒,卵多产于叶背,呈嵌纹分布。每头雌蝶产卵100—200粒。卵期4—8天。幼虫分5龄,虫期 Cabbage butterfly, also known as white butterfly, is one of the major pests of Datong cruciferous vegetables. We conducted a study on its occurrence and prevention and control measures from 1979 to 1982. First, the habits of the pupa in the vegetable field near the soil walls, trunk, soil cracks, weeds and stubble deciduous wintering, hi sunny but dry sunlight but not direct exposure to the environment. Overwintering different places, overwintering pupae have uneven emergence, which is an important reason for the generational overlap. Adult worms begin to dry in the daytime, fly in the vegetable fields, eat nectar, and have the highest activity when there is plenty of sunny and windless sunshine. Night habitat in the growth of more dense plants, 2-3 days after mating began spawning. Adulterated mustard oil very strong, likes to spawn in cabbage, nectar from the nectar near the edge of the high amount of eggs. 1 egg per spawn 1, eggs prolific in leaves back, was embedded in the distribution. Female spawns 100-200 eggs per head. Egg 4-8 days. Larvae 5 age, worm stage