水稻白叶枯病又称白叶瘟、茅草瘟、地穴烧等。是一种细菌性病害。全国各稻区几乎都有发生。在我们安徽省内普遍发生,尤其是江淮丘陵和沿江江南稻区受害最重,主要为害水稻叶片,造成叶枯,使叶片失去光合作用,严重影响育机物的合成。对产量影响很大。如果在抽穗前发病,顶叶(功能叶)枯死,一般减产3—5成:灌浆后发病损失较小,一般减产1—3成。如病害大流行时往往造成颗粒无收。(一)主要症状。病菌主要为害叶片。通常是苗期传染,中、后期暴发。秧苗期虽有 Rice bacterial blight also known as white leaf plague, thatch plague, crypt and so on. It is a bacterial disease. Almost all areas of the country have occurred. In Anhui province, especially in the Jianghuai hills and the Yangtze River, the most affected area is rice fields, which mainly damage rice leaves, causing leaf blight and losing the photosynthesis of the leaves, seriously affecting the synthesis of the machine. Great impact on the yield. If the disease before heading, the parietal lobe (functional leaves) dead, the general reduction of 3-5%: less incidence of loss after grouting, the general cut 1-3. Such as disease pandemic often result in crop failure. (A) the main symptoms. Pathogen mainly damage leaves. Usually seedling infection, the outbreak in the late. Although the seedling stage