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春季保护地栽培莴苣,在天气多变且低温高湿条件下,容易发生霜霉病和菌核病,这是莴苣生产中常见的两种病害,影响莴苣的产量和品质。现将这两种病菌的症状及防治方法介绍如下:霜霉病。是一种真菌性病害,莴苣盘梗霉专性寄生,主要危害叶片,近地面叶片先发病,病叶上产生浅黄色近圆形或多角形病斑,以多角形病斑为多,潮湿时叶背长出白霉,后期病斑主要黄褐色,许多病斑相连使
Lettuce is cultivated in spring, and downy mildew and sclerotinia are susceptible to weather changes and low temperature and high humidity, which are two common diseases in lettuce production, affecting the yield and quality of lettuce. Now the symptoms of these two pathogens and prevention methods are described below: Downy mildew. Is a fungal disease, lettuce Placenta mold parasitic disease, the main hazards of leaves, the first onset of near-surface leaves, diseased leaves produce a light yellow sub-round or polygonal lesions, with polygonal lesions as more wet Leaf back grow white mold, the main lesion tan color, many lesions linked