我县近几年来苏丹草的病害严重,使苏丹草产量下降,本人多年来对此病进行观察和病叶保湿培养镜检,结果证明是一种真菌性病害。此病症状是叶片上产生紫红色椭园形或不正形病斑,病斑逐渐变为深褐色,并不断扩大到相互结合或连续生长,导致半片叶或全叶变黑干枯,严重时造成早期枯死。此病一般多在苏丹草生长中期和后期为害严重,高温多雨有利于本病的发生流行;土质瘦瘠,肥力不足,施肥过少,病害往往发生严重。 In recent years, my county Sudan grass serious disease, Sudan grass production decline, I have over the years to observe the disease and diseased leaves moist culture microscopy, the results proved to be a fungal disease. Symptoms of the disease are purple or oval-shaped lesions on the leaves, lesions gradually become dark brown, and continue to expand to each other or continuous growth, leading to half of the leaves or whole leaves black dry, causing severe early Death. The disease is generally more serious in the mid and late Sudan grass growing serious, high temperature and rainy is conducive to the prevalence of this disease; soil thin barren, fertility, fertilization is too small, the disease often serious.