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近年来莲藕褐斑病有发生加重的趋势,对莲藕生产造成了一定的损失。夏季高温多雨有利于该病发生,应及时采取措施防治。莲藕褐斑病属真菌性病害,病菌主要危害叶片,叶柄上较少表现症状。发病初期叶片正面出现针头大小的圆形黄褐色斑点,在叶背尤为明显,以后扩大成0.5~2厘米大小的圆形或不规则形褪绿褐色大斑或暗褐色枯死斑,叶背病斑颜色略浅于叶片正面,呈褪绿大黄斑。病斑稍凹陷,有时有明显的褐色同心轮纹,病健交界
In recent years, lotus leaf brown spots have aggravated the trend of the lotus root production caused some losses. Summer hot and humid are conducive to the occurrence of the disease, timely measures should be taken to prevent and cure. Lotus leaf brown spot is a fungal disease, the main hazards of pathogens leaves, petiole less symptoms. In the early stage of emergence, the diameter of needle-shaped round yellow-brown spots appears on the front of the leaves, especially on the leaves. After that, the round or irregular shaped chlorophyll spots or irregular brown chlorotic spots with a size of 0.5 ~ 2 cm were enlarged, Color slightly lighter than the front of the leaves, was faded green macular. Slightly depressed lesion, and sometimes obvious concentric circles of brown lines, sick junction