十字花科蔬菜的各种病害,直接影响蔬菜的产量和品质。就太原市来说,1978年大白菜因病害减产1亿多斤,国家从外地调菜损失200多万元;黄瓜因霜霉病减产50%以上;1981年全市西红柿因条斑病毒为害减产2成以上,造成严重经济损失,影响城乡人民生活和健康。现就蔬菜主要病害介绍如下。一、霜霉病蔬菜霜霉病主要有十字花科植物霜霉病(Peronospora parasitica),又叫落叶病、龙头病,通称白菜霜霉病。初浸染叶着绿色污点,后生白霉,病斑渐黄,最后呈淡褐,被叶脉包围成不规则的多角形,常和黑腐 Cruciferae vegetable diseases, a direct impact on vegetable yield and quality. In Taiyuan, in 1978, cabbage cut more than 100 million kilos due to disease and the government lost more than 2 million yuan from the field. Cucumber reduced production of downy mildew by more than 50%. In 1981, As a result, serious economic losses have been caused, affecting the lives and health of urban and rural people. The main vegetable diseases are introduced below. First, downy mildew vegetables Downy there are cruciferous plants downy mildew (Peronospora parasitica), also known as deciduous disease, leading disease, commonly known as cabbage downy mildew. The initial dip leaves with green stains, after the birth of white mold, lesion gradually yellow, finally pale brown, surrounded by veins irregular polygons, often and black rot