秋菜的虫害主要有蚜虫、菜青虫、小菜蛾、夜蛾类(主要是斜纹夜蛾、甜菜夜蛾)、菜螟等;主要病害有病毒病、软腐病、霜霉病等。一、虫害防治方法1、危害症状(1)蚜虫。往往成群密集在菜叶和嫩茎上,吸食植物体内的汁液,造成严重失水和营养不良。蚜虫还传播多种病毒病。(2)菜青虫。 Autumn vegetables pests are aphids, Pieris rapae, Plutella xylostella, the night moth (mainly Spodoptera exigua, beet armyworm), gall borers; the main diseases are viral disease, soft rot, downy mildew and so on. First, the pest control methods 1, the hazards of symptoms (1) aphids. Often densely packed in leaves and tender stems, the body sucks the juice, resulting in severe dehydration and malnutrition. Aphids also spread a variety of viral diseases. (2) cabbage worm.