1大葱霜霉病1．1症状识别及传播规律：大葱植株生长期被青叶片上产生黄白色卵圆形或圆形病斑，边缘不明显。潮湿时，病斑表面产生一层疏松的白色霉层。后期病斑上变成暗紫花，或淡灰黄色。叶片中下部染病时，病部以上叶片下垂而干枯或叶片折倒。病菌主要以卵抱子在土壤中的病残 1 green onychomycosis 1.1 Symptoms identification and transmission of law: green onion plant growth stage was yellow-white oval or round lesions, the edge is not obvious. Wet, the lesion surface layer of white moldy layer of loose. Later lesions become dark purple, or light gray yellow. Lower leaves in the disease, the disease above the leaves sagging or leaf folds. Pathogenic bacteria mainly in the soil of egg-spawning disease