早秋蔬菜的主要虫害有菜青虫、蚜虫、小菜蛾、菜螟等,只有防治方法得当,才能控制危害,确保蔬菜优质高产。 一、菜青虫 以幼虫危害多种蔬菜。初龄幼虫在叶背取食叶肉,2～3龄幼虫在叶面或叶背咬成缺刻,4～5龄幼虫危害猖獗,将全叶吃光,仅留下粗大叶脉。菜青虫除直接危害外,还引起蔬菜腐烂和粪便污染,造成伤口,有利 The main pests of early autumn vegetables cabbage caterpillars, aphids, diamondback moth, borer and so on, only the prevention and treatment methods properly, in order to control the hazards, to ensure high quality and high yield of vegetables. First, cabbage caterpillar larvae endanger a variety of vegetables. The first instar larvae fed on the leaf back, and the 2nd to 3rd instar larvae bite on the foliage or leaf back. The larvae of 4th to 5th instar larvae were endangered and the whole leaf was eaten, leaving only the large veins. Pieris rapae in addition to direct harm, but also cause vegetable rot and fecal contamination, resulting in wounds, favorable