该病为国内首次报道,在南宁、贵港等市县近年来有日趋严重之势。4～5月见病,夏秋时节病重,病叶率达70％以上。此病常和其他叶斑病并发,导致荷叶成片早枯,严重影响藕的产量和品质。 症状:谚病危害叶片。病斑圆形或不规则形,具同心轮纹,略凹陷。病斑正面红褐色,背面色较浅。病健交界处波纹状。迎光观察半透明,黄绿色。幼叶病斑紫黑色,轮圈不明显。斑上生黑色小粒,即病菌分生孢子盘。 The disease is the first reported in China, in Nanning, Guigang and other cities and counties in recent years have increasingly serious trend. April to May see the disease, summer and autumn sick, diseased leaves rate of 70% or more. This disease and other leaf spot disease often complicated, leading to early dry lotus leaf into pieces, seriously affecting lotus root yield and quality. Symptoms: proverbs endanger the leaves. Spot circular or irregular shape, with concentric wheel pattern, slightly depressed. The lesion is reddish brown and the back is lighter. Ill health junction corrugated. Welcome to observe translucent, yellow-green. Young leaves purple spot black, rim is not obvious. Black spots on the black tablets, that is, bacteria conidia disk.