谷瘟病的病原菌为灰梨孢菌,属半知菌亚门梨胞菌属真菌。在我国谷子产区普遍发生,是谷子的重要气传流行性病害。近年来由于推广的品种抗性较差,在部分地区危害有逐年加重趋势。1.病害特征谷子各生育期均能发病,可侵害谷子叶片、叶鞘、节、穗颈、穗轴或穗梗等部位,引起叶瘟、穗颈瘟、穗瘟等不同症状,其中叶瘟、穗瘟发生普遍且危害严重。叶瘟:谷子苗期即可发病,病菌侵染叶片,先出现椭圆形暗褐色水渍状小斑点,以后发展成梭形斑,中央灰白色,边缘褐色,部 The pathogen of the blast is Pyricularia oryzae, which belongs to the genus Myceliophthora. Millet producing areas in our country generally occur, is an important epidemic of cereal epidemic disease. In recent years due to the promotion of the varieties of poor resistance, in some areas have increased the risk of increasing year by year. 1. Disease characteristics Millet can develop during the various stages of its development and can affect millet leaves, leaf sheaths, nodes, panicles, cob or panicle and other parts, causing leaf blast, panicle blast, head blast and other symptoms, including leaf blast, Head blast occurred widespread and serious harm. Leaf plague: millet seedling can be disease, pathogen infection leaves, first appeared oval dark brown water-like small spots, later developed into a fusiform spot, the central gray, brown edge, the Department