稻曲病又称青粉病、谷花病,多在抽穗扬花期感病,是水稻穗期重要病害之一。发病后,不仅影响产量,而且病原附在稻米上,污染米粒,严重影响品质。近来年,由于氮肥施用量提高,水稻种植粳性化,该病发生呈现加重趋势。发病严重时,能引起减产30%～50%。2004年该病在我地发生严重,损失较 False false smut, also known as powdery mildew, cereal disease, and more flu in the flowering stage is one of the important diseases of rice heading stage. After the onset, not only affect the yield, but the pathogen attached to rice, rice pollution, seriously affecting the quality. In recent years, due to the increase of nitrogen fertilizer application, rice planting japonica, the occurrence of the disease showed an increasing trend. Severe illness, can cause 30% to 50% reduction. In 2004 the disease occurred in my serious, more loss