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选用对１２个抗瘟单基因致病力较强的宁夏菌株１２个，经７次转管后测定表明：各菌种的产孢能力与母株比较无明显变化；但对１２个抗瘟基因的致病性却发生了不同的变化。致病性稳定的菌株和致病谱范围有所下降的菌株各５个，分别占所测菌株的４１．７％；２个菌株的致病范围有升有降，占所测菌株的１６．７％。表明在稻瘟病的多变性中，也存在着致病力相对稳定的菌株，因而这几个菌株可为宁夏抗瘟分析所利用。
12 strains of Ningxia isolates with strong virulence were selected. Twelve tubes were used to determine the ability of sporulation. There was no significant difference in the ability of sporulation between the strains and their parent strains. However, The pathogenicity has undergone different changes. The five strains with stable pathogenicity and the decreased pathogenicity range accounted for 41.7% of the tested strains, respectively. The pathogenicity of the two strains increased or decreased, accounting for 16% of the tested strains. 7%. This indicates that there are also strains with relatively stable pathogenicity in the variety of rice blast disease. Therefore, these strains can be used for anti-blast analysis in Ningxia.