自70年代末以来,作者分别在辽宁的大连、沈阳、锦州、丹东,以及山东的济南、泰安等地发现严重威胁花生生产的病害——花生云纹斑病。经鉴定(1982),其病原菌系壳二胞属(Ascochyta)真菌。形态与Ascochyta arachidis(Woron,1923)存在较明显差异,现将观察和试验结果简报如下: 一、症状 花生云纹斑病主要为害叶片,一般植株底部叶片先受害,病斑由褐色小点逐渐扩大、愈合,形成褐色至栗褐色圆、椭圆或不规则大病斑。边缘淡褐色,界限不明显。后期病斑上出现栗褐色小粒点,即分生孢子器。罹病初期叶背面并无明显症状,后期隐约可见有淡褐色病斑(图1)。 二、病原菌及其寄主范围 将病叶分离 Since the late 1970s, the authors found that peanut moyamorphosis, a disease that is a serious threat to peanut production, was found in Dalian, Shenyang, Jinzhou and Dandong in Liaoning Province, Jinan and Taian in Shandong respectively. Identified (1982), the pathogen is the genus Ascochyta (Ascochyta) fungus. Morphology and Ascochyta arachidis (Woron, 1923) there is a more significant difference, the observations and test results are briefly presented below: First, the symptoms of perennial cloud leaf spot disease mainly leaves, the bottom of the general plant leaves the first victims, lesions gradually enlarged from the brown dot , Healed, forming brown to chestnut brown round, oval or irregular large lesions. Edge light brown, the boundaries are not obvious. Late lesions appear brown chestnut brown spots, that conidia. The early onset of disease no obvious symptoms on the back of the leaf, the late vaguely visible light brown spots (Figure 1). Second, the pathogen and its host range will be diseased leaves separation