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稻纹枯病是水稻的主要病害之一。近年来由于插秧密度增加,矮杆,宽叶,分蘖力强的高产良种的推广以及施肥水平提高,稻纹枯病发生危害面积逐年增加,日益严重。早稻发病重于单季稻和双季晚稻,轻的影响稻谷灌浆,重的植株枯萎倒伏,不抽穗、不结实。严重田块减产五成以上。一般在水稻分蘖末期开始发病.园秆拔节到抽穗期盛发。先在近水面的叶鞘上出现椭园形污绿色的水渍状病斑,逐步扩大成云纹状病斑.向上部叶鞘、叶片发展,严重时可侵害到顶
Rice sheath blight is one of the main diseases of rice. In recent years, due to increased planting density, dwarf bar, wide leaf, tillering and high yield of improved varieties of popularization and fertilization, rice sheath blight damage area increased year by year, increasingly serious. The incidence of early rice was heavier than that of single-cropping rice and double-cropping late rice. Light-affected rice grain filling, heavy plants wilting and lodging, not heading and not growing. Significant reduction of more than half of the field plots. Generally in the late stage of tillering of rice began to grow. First appeared in the surface of the leaf sheath on the oval-shaped stain of greenish water-like spots, and gradually expand into a cloud-like lesions to the upper leaf sheath, leaf development, may be infringed to the top