稻云形病和褐色叶枯病是我省水稻上的新病害。稻云形病1969年开始在我省发生以来,逐年在蔓延,不仅危害早稻,也危害晚稻,山区平原都有发生。1973年发现其症状,脑公社不但具有典型的云形症状,而且也能在叶片中间形成不整形的褐点或褐斑。1978年高安县石早稻(原丰早)大面积严重发生(6,000亩)褐色叶枯病,损失很大,现场检查其病原菌的 Rice cloud disease and brown leaf blight is a new disease in rice in our province. Cloud-shaped disease began in 1969 in our province since the year after year, spreading, not only endangering early rice, but also endanger late rice, mountain plains have occurred. The symptoms were discovered in 1973. The commune not only has the typical cloud-like symptoms, but also forms the undeformed brown spots or brown spots in the middle of the leaves. In 1978, a large area (6,000 mu) of brownish leaf blight occurred on Shihtai rice (Haoyuanzao) in Gao’an County with a great loss. The on-site inspection of its pathogenic bacteria