１９９１一１９９４年对广东省稻瘟病菌生理小种发生和分布情况的研究表明，ＺＢ群是广东的优势种群，ＺＣ群次之；优势小种主要是Ｂ＿（１３）、Ｂ＿５、Ｂ＿１和Ｃ＿（１３）。但不同稻作区之间发生动态有差异，优势种群ＺＢ群是随着海拔高度上升，出现频率逐渐上升，优势小种的致病性也是随着纬度上升而增强。 From 1991 to 1994, the study on the occurrence and distribution of races of Magnaporthe grisea from Guangdong Province showed that the ZB group was the dominant species in Guangdong and the ZC group was the second. The dominant species were B 13, B 5, B 1 and C_ 13). However, there were differences in dynamics between different paddy fields. The ZB population of dominant populations increased with altitude, and the frequency of occurrence increased gradually. The pathogenicity of dominant races also increased with the increase of latitude.