柿角斑病是柿树的重要病害,各柿产区均有发生,发病严重时,造成柿树早期落叶、落果,对树势和产量影响很大。 一、症状 该病主要为害柿叶及柿蒂。叶片受害,初期在正面出现黄绿色病斑,形状不规则,边缘较模糊,斑内叶脉变黑色,背面呈淡黄色。随病斑的扩展,颜色加深,呈浅黑色,以后中部颜色为浅褐色。病斑扩展受叶脉限制,呈多角形,其上密生黑色线状小粒,有明显的黑色边缘,背面颜色较浅也有黑色边缘。病斑自出现至定型约需一个月,大小为2—8 Persimmon leaf spot disease is an important disease persimmon, persimmon areas have occurred, the incidence is severe, resulting in persimmon early deciduous, deciduous trees and yield a great impact. First, the symptoms of the disease mainly persimmon leaves and persimmon. Leaf damage, the initial appearance of yellow-green lesions on the front, irregular shape, the edge of the more fuzzy, intracortical veins become black, pale yellow back. With the expansion of the lesion, the color deepened, was light black, after the middle of the color is light brown. Lesions extended by the veins, was polygonal, its dense black linear grains, with a clear black edge, the back of the lighter colors also have black edges. Lesions from appearance to shape about one month, the size of 2-8