菜青虫是蔬菜上常见害虫,其成虫叫菜粉蝶、白粉蝶、菜白蝶,是以幼虫为害,其幼虫就是叫菜青虫。成虫的翅为白色、顶角灰黑色,雌蝶前翅有2个显著黑斑、雄蝶只有1个;幼虫为深绿色,主要危害叶菜类,尤以小白菜、白菜心,大白菜、芥兰、甘蓝等受害最普遍。其虫口数量的发生是随季节而变更和带 Pieris rapae is a common vegetable pests, its adult called cabbage butterfly, white butterfly, cabbage white butterfly, is larvae damage, the larva is called cabbage caterpillar. The adults’ wings are white and the top is gray-black. There are two prominent dark spots on the front of female butterflies and only one on male butterflies. The larvae are dark green, and the major hazards are leaf vegetables, especially Chinese cabbage, cabbage heart, Chinese cabbage, mustard Blue, cabbage and other victims of the most common. The number of its population occurs with the seasons and changes