稻瘟病又称稻热病 ,属真菌病害 ,是水稻主要病害之一。水稻整个生育期都会发病 ,因危害稻苗、稻叶、穗颈、稻节、稻粒等 ,故称为苗瘟、叶瘟、穗颈瘟、节病、谷粒病。特别是苗瘟、叶瘟和穗颈瘟常会危害成灾 ,是水稻优质、高产的大敌。正阳县 2万ｈｍ2 水稻发病 1.12万ｈｍ2 ,一 Rice blast, also known as rice fever, is a fungal disease and is one of the major diseases of rice. Rice will be the entire growing period of disease, as a result of endangering rice seedlings, rice leaves, panicle neck, rice section, rice and so on, so called seedling blast, leaf blast, panicle blast, disease, grain disease. In particular, seedling blast, leaf blast and panicle neck blast often endanger disaster, is the enemy of high quality and high yield of rice. Zhengyang County 20,000 hm2 rice incidence of 11,200 hm2, one