席草纹枯病,又名云纹病,是席草的主要病害。本县4月中旬始见病株:叶鞘基部表面出现褪绿病斑,并逐渐扩大成长椭圆形,中央灰白色,病、健部交界处褐色或暗褐色。常多个病斑连在一起,如云纹状。在多雨季节,发病率可直线上升。6月中旬席草分蘖终止,病株率增长减缓,但病部自叶鞘 I grass grass blight, also known as moire, is the main disease grass seats. The county saw the disease in mid-April: chlorotic spots appeared on the basal surface of leaf sheath, and gradually expanded to grow oval, central gray, brown, or dark brown at the junction of disease and health department. Often more than one lesion together, such as moire-like. In the rainy season, the incidence can go up straight. In mid-June, the tiller termination of the grass mat, slowed down the rate of diseased plants, but the disease from the leaf sheath