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一、发病症状霜霉病一般先从下部叶片开始发病,发病初期产生淡绿色水渍状小点,病斑边缘不明显,后期发展为黄色不规则病斑,湿度大时叶背产生灰白色霉层,逐渐变为深灰色。棚室内干旱时病叶逐渐变黄、干枯,空气湿度大时发病叶片霉烂。
First, the onset of symptoms Downy mildew generally start the disease from the lower leaves, the incidence of early light green water-like dots, the lesion edge is not obvious, the latter developed into yellow irregular spots, leaves humidity when large gray mold layer , Gradually becomes dark gray. When the shed indoor drought gradually yellow leaves, dry, air humidity leaves mildew disease.