油麦菜又名莜麦菜,苦菜,是以嫩梢、嫩叶为产品的尖叶型叶用莴苣,其质地脆嫩,口感好,营养成分高,且管理相对简单,种植效益较好。笔者在海城市、辽中县、盖州市、瓦房店市等地保护地调查发现,有几种病害经常发生,由于症状相似,农户常常混淆,而延误防治。在此将诊别方法介绍如下:一、霜霉病与白粉病。两种病害均是油麦菜常见病害,共同点是发病后叶上起白霜。在生产上这两种病害如何区别?辨别的要点是:白霜的 Olea europaea, also known as oatmeal, bitter herbs, is a tip of young leaves, leaves for the leaves of the product leaf lettuce, crisp texture, taste good, high nutritional content, and the management is relatively simple, planting better. The author in Haicheng City, Liaozhong County, Gaizhou City, Wafangdian City and other places to protect the survey found that there are several diseases often occur, because the symptoms are similar, farmers are often confused, and delayed prevention and treatment. Diagnostic methods will be introduced here as follows: First, downy mildew and powdery mildew. Both diseases are common diseases of lettuce, the common point is that after the onset of the disease from the hoar frost. In the production of these two diseases how to distinguish? The key points are: hoarfrost