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通过每 10年 1次对病原菌致病力分化的监测发现 ,国内稻区病菌小种的组成基本稳定 ,仅个别小种有所变化。目前流行的优势小种仍为C1和C2群 ,即携带有Xa3抗性基因的品种仍可广泛种植 ;但能够侵染Xa4抗性基因的C4、C5群小种的数量有所增加 ,即将达到流行的阈值。为便于与国内外小种鉴别的结果相比较 ,选用IRRI推出的几个近等基因系材料作为鉴别品种 ,将中国的白叶枯病菌区分为 8个小种 (C1～C8)。
Through monitoring the pathogenicity differentiation of pathogens once every 10 years, it was found that the composition of germ-line races in the rice-planting areas in China was basically stable with only some races changing. At present, the dominant race is still C1 and C2, that is, the variety carrying Xa3 resistance gene can still be widely planted; however, the number of race C4 and C5 races that can infect Xa4 resistance gene is about to reach The prevailing threshold. In order to compare with the identification results of races at home and abroad, several isogenic lines from IRRI were selected as the identification cultivars, and the bacterial blight of China was divided into eight races (C1 ~ C8).