韭菜灰霉病俗称“白点”病，发生普遍,还可危害葱、蒜等作物。一、症状主要危害叶片，初在叶面产生白色至淡灰色斑点，随后扩大为椭圆形或梭形，后期病斑常相互联合产生大片枯死斑，使半叶或全叶枯死。湿度大时病部表面密生灰褐色霉层。有的从叶尖向下发展，形成枯叶，还可在割 Leek Botrytis commonly known as “white spots” disease, the occurrence of widespread, but also onions, garlic and other crops. First, the main symptoms of the leaves hazards, the beginning of the leaves to produce white to pale gray spots, and then expanded to oval or fusiform, late lesions often associated with large patches of dead spots, so that the half-leaf or whole leaves dead. Humidity when the Ministry of disease surface gray-brown moldy layer. Some from the tip down development, the formation of dead leaves, but also in the cut