随着莴苣种植面积的扩大 ,莴苣叶枯病渐渐成为生产中的重要病害。莴苣叶枯病是由莴苣针壳孢 (Ｓｅｐｔｏｒｉａｌａｃｔｕｃａｅ)真菌侵染而引起的。初春在莴苣幼苗嫩叶上 ,出现中央灰褐色、边缘黄褐色、长径 1～ 5ｍｍ的不规则斑点 ,病斑可相连成大斑块 ,最后呈暗褐色 ,表面生 With the expansion of lettuce planting area, lettuce leaf blight has gradually become an important disease in production. Lettuce leaf blight is caused by the fungus Septorialactucae lettuce infection. Early spring lettuce seedlings on the leaves, the emergence of the central gray brown, brown edge, long diameter 1 ~ 5mm irregular spots, lesions can be linked into a large plaque, the last was dark brown, superficial students