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大蒜叶枯病主要危害叶片。叶片染病后，初期呈花白色小圆点，并从叶尖开始向下发展。病斑扩大后呈不规则的灰白色病斑，潮湿时病斑上产生霉状物，并由灰白色转变为灰褐色。发病轻时仅造成叶尖干枯，条件适宜时可造成大蒜整叶甚至整株枯死。 发病条件： １、土壤粘重、透气性差
Garlic leaf blight the main hazard leaves. Leaf blade disease, the initial pale white dots, and began to develop from the tip. After the lesion enlarged irregular gray spots, damp spots on the mildew, and from gray to brown. Slight onset of light caused only leaves dry, suitable conditions can cause the entire leaf of garlic even the whole plant died. Disease conditions: 1, soil sticky, poor ventilation