草坪纹枯病,冷暖地型草在5～9月均可能发生,以引进的品种为较严重。刚发生时草如被开水烫伤状,发软发灰,基腐烂变色,以后发展至全草枯黄发褐,还能在病草上找到小的黑色颗粒状物——茵核。天气潮湿时,还可以见到絮状菌丝体。草坪纹枯病的发生受气候条件、土壤、施肥、叶片湿度、播种量、割草高度等多种因素的综合影响。气候条件当日平均气温达22℃,又有雨湿时,此病开始零星发生,在23～25℃并伴有雨湿时,更促使病情的扩展,特别在28～32℃和97％以上的相对湿度时发展最快。一般当 Lawn sheath blight, warm and cold grass in May to September may occur to introduce the more serious species. Just as the grass was boiled watery scalding, hair gray hair, the basis of rotten discoloration, after the development of brown hair brown hair, but also in the sick grass to find a small black particles - the nucleus. When the weather is wet, you can also see flocculent mycelium. The occurrence of turf sheath blight is affected by a variety of factors such as climatic conditions, soil, fertilization, leaf humidity, seeding rate and mowing height. Climatic conditions on the average temperature of 22 degrees Celsius, and the rain wet, the disease began sporadic, at 23 ~ 25 ℃ and accompanied by rain, but also to promote the expansion of the disease, especially in the 28 ~ 32 ℃ and 97% of the The fastest relative humidity. General when