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水稻病害的种类很多,其中稻瘟病、纹枯病和白叶枯病发生面积大、流行性强、危害严重,是水稻上的“三大重要病害”。稻瘟病是一种真菌性病害,在水稻的各生育期、各个部位均可发生。根据其发病时期和发病部位可分为苗瘟、叶瘟、节瘟、穗颈瘟、谷粒瘟等。苗瘟由种子带病引起,一般发生在三叶期之前,病苗在靠近土面的基部变成灰黑
There are many types of rice diseases, of which rice blast, sheath blight and bacterial blight occur in large area with strong epidemic and serious harm, which is the “three major diseases” on rice. Rice blast is a fungal disease that can occur in all parts of rice during each growing stage. According to the pathogenesis of the disease and the site can be divided into seedling blast, leaf blast, section blast, panicle blast, grain plague and so on. Seedling blast disease caused by the seed, usually occurs before the three-leaf stage, the sick seedling near the surface of the soil becomes gray