稻瘟病、稻曲病、纹枯病是水稻较难防治的三大病害。加之空秕粒逐年增多,影响了水稻的产量和品质。防治水稻病害和空秕粒,是水稻优质高产的保证。一、稻瘟病的防治稻瘟病是水稻的重要病害,因危害时期和部位不同,分为苗瘟、叶瘟、穗颈瘟,以穗颈瘟危害最重。稻瘟病一直是难以防治的难题。 Rice blast, rice false smut and sheath blight are the three major diseases that rice is hard to control. In addition, the increase in the number of Kongjiao grain each year, affecting the yield and quality of rice. Prevention and control of rice diseases and empty grains, is the guarantee of high quality and high yield of rice. First, the prevention and control of rice blast Rice blast is an important disease of rice, due to different stages of harm and divided into seedling blast, leaf blast, panicle blast, panicle blast to the hardest hit. Rice blast has always been a difficult problem to prevent.