小粒菌核病是近几年在北方稻作区发生蔓延的一种病害，此病在查哈阳农场有发病面积逐年扩大、危害程度逐年加重的趋势，可能成为今后危害水稻程度较重的病害之一。通过对小粒菌核病发病机理分析，认为该病的发生受田间菌核数量的影响，据此提出了防治方法。 Small sclerotiorum is a disease that has spread in the northern paddy area in recent years. The incidence of this disease in Zhahayang farm has been expanding year by year, and the degree of harm is increasing year by year, which may become a disease that will endanger the degree of paddy in the future one. Through the analysis of the pathogenesis of S. scab, the occurrence of this disease is considered to be influenced by the number of sclerotia in the field, and the prevention and cure methods are put forward accordingly.