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利用４３个山西省的小麦白粉菌株对３６个已知抗白粉病基因品种（系）和推广品种（系）进行毒力频率测定，结果表明对Ｐｍｌ，Ｐｍ３ａ，Ｐｍ５，Ｐｍ７，Ｐｍ８的毒力频率较高，不宜单独应用，对Ｐｍ４ａ，Ｐｍ４ｂ，Ｐｍ２ｘ，Ｐｍ２＋６及肯贵阿１号的毒力频率较低，是高抗基因，Ｐｍ２，Ｐｍ６介于以上两种类型之间，有一定的利用价值。对许多推广品种（系）毒力频率较高，说明目前存在着大面积感病寄主，生产上应做好防治准备。此外，菌源中存有极复杂的生理转化现象，其中对鉴别寄主低毒性的小种占优势。
The virulence frequency of 36 wheat powdery mildew resistant cultivars (lines) and popularized varieties (lines) was determined by using 43 strains of wheat powdery mildew in Shanxi Province. The results showed that the virulence frequencies of Pml, Pm3a, Pm5, Pm7 and Pm8 Higher, and should not be applied alone. The frequency of virulence to Pm4a, Pm4b, Pm2x, Pm2 + 6 and Ken-Gua 1 is low, and it is a high resistance gene. Pm2 and Pm6 are between the above two types and have certain utilization value . The frequency of virulence of many varieties (lines) is higher, indicating that there are currently large-scale susceptible hosts and should be prepared for prevention and treatment in production. In addition, there are extremely complicated physiological transformations in the bacterial source, among which, race species with low toxicity to the host are dominant.