韭菜白斑叶枯病又叫韭菜灰霉病、韭菜白点病和腐烂病,是冬季棚室韭菜的主要病害。 发病症状 主要为害叶片,分为白点型、干尖型和湿腐型三种。(1)白点型和干尖型最初在叶片正面或背面生白色或浅灰色褐色小斑点,由叶尖向下发展,病斑菱形成或椭圆形,有时相互汇合成斑块,致半叶或全叶枯焦,湿度大时,枯叶表面上稀疏的霉层。(2)湿腐型发生在湿度大时,叶上不产生自点,枯叶表面密生灰至绿色绒毛状霉,伴有霉味。(3)干尖型由割茬刀 Leek white leaf blight, also known as leek gray mold disease, leek white point disease and rot disease, is the main disease in winter shed leek. The main symptoms of damage leaves, divided into white-point type, dry-type and wet-type three. (1) white point type and dry point type The first white or light gray brown spots on the front or back leaves, down from the tip of the disease, the lesion rhomboid or oval, sometimes combined with each other into plaque, caused by half a leaf Or whole leaf Kujiao, humidity, dead leaves on the surface of the moldy layer. (2) wet rot occurs when the humidity is high, leaves do not produce self-point, the dead leaf surface gray to green hairy mold, accompanied by musty. (3) Dry tip type cut stubble knife