寒冷季节蔬菜的害虫有四个特征：一是数量不多，但个体较大，吃菜叶，一条虫一昼夜能侵害数株蔬菜。二是不易被发现，具有十分逼真的保护色，其颜色与蔬菜极为相近，有的甚至形状与蔬菜的某部分一模一样。三是怕冷，昼伏夜出。白天躲在密集的菜中和菜的叶下，茎及蔸下，夜间出 Cold season pests vegetable has four characteristics: First, a small number, but larger, eat leaves, a worm can damage a few days and nights of vegetables. The second is not easy to find, with a very realistic color protection, its color and vegetables are very similar, and some even the shape of a part of the same vegetables. Third, cold, nocturnal. During the day hiding in the dense dishes and vegetables under the leaves, stems and mastiff, at night out