稻粒黑粉病又名乌谷、黑穗病，水稻种植区均有分布，以往认为此病危害没有经济上的意义，不需防治，随着杂交水稻的大面积种植，南方稻区此病的发生及危害日趋严重，常年损失５％～２０％，最高达５０％，成为杂交稻制种田的毁灭性病害。我省于８０年代初此病开始发生，以... Rice grain powdery mildew, also known as black valley, smut, rice planting areas are distributed in the past that the disease does not have the economic significance of harm, without prevention and treatment, with large-scale hybrid rice cultivation, the southern rice disease The occurrence and the harm are becoming more and more serious. The perennial loss of 5% -20%, up to 50%, become the devastating disease of hybrid rice farming. The province in the early 80s the disease began to occur, with ...