【摘要】 花生云纹斑病是我国花生生产上的一种新病害。经鉴定,其病原菌是一种真菌,属于半知菌亚门、球亮孢目、壳二孢属(Ascochyta sp.)。接种试验表明,该菌主要为害花生叶片,其次为害叶柄和托叶,而茎和荚果不发病;该菌不为害大豆、赤小豆、豌豆、蚕豆和菜豆。病菌以分生孢子器形态在病叶内越冬;翌年六月下旬～七月上旬从植株底部叶片开始发病,七月下旬～八月上旬形成子实体,借风雨传播进行重复侵染。病害流行与八月份降雨量有关。花生品种间存在着抗性差异。更多还原

【Abstract】 The cloudy spot disease in peanut is a newly found disease in China. The causal agent identified is a species of fungi belonging to genus Asco- chyta and is named Ascochyta sp. tentatively. Inoculation experiment showed that the pathogen infected mainly the leaves, secondly the petioles and the stipules, but not the stems and the pods. The above mentioned fungi infected peanut only, and did not affect soybean, red bean, pea, broad bean and kindney bean. The pathogen overwintered in the infected leaves in the form of pycni- dia, and the disease started from the lower part of leaves from late June till early July in the next year. From late July till early August, the pa- thogen began to bear fruiting bodies to be spread by wind and rain to cause reinfection. The degree of outbreak of the disease depended on the rainfall in August. There was difference in the resistance shown in diverse varieties of peanut.更多还原