玉米指梗霉(Sclerospora maydis)所致的玉米霜霉病,广泛分布于滇桂两省区的低海拔湿热地区。一般受害田块损失率5～10％,严重者可高达60％以上。本病菌在滇南湿热地区以菌丝体在甜根子草(Saccharum spontaneum L.)的茎叶内越冬,翌年春雨透地后产生孢子囊,随气流传播,侵染出土的 Maize downy mildew caused by Sclerospora maydis is widely distributed in low-altitude hot and humid areas in Yunnan and Guangxi provinces. General damage to the field loss rate of 5 to 10%, severe cases can be as high as 60%. The bacteria in the wet and dry areas of southern Yunnan mycelium in the sweet root grass (Saccharum spontaneum L.) stems and leaves of the winter, the spring after the rain through the sporangia, with the air flow, the invasion of unearthed