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１９８３年以来，小麦抗白粉病基因资源的抗性鉴定表明，包含二个或二个以上基因联合及多基因抗源的抗性一直表现强而稳定；而单基因抗源抗性容易丧失；包含Ｐｍ８抗病基因的抗源及其衍生种在近几年丧失抗性。我国小麦白粉病抗源单一化是导致小麦白粉病流行及日趋严重的主要原因。当前采用多基因、多源化新抗源是克服抗源单一的主要措施。进一步加强微效、多基因抗源的发掘和利用，把主效基因和微效基因结合起来，以维持抗性的持久和稳定。
Resistance to powdery mildew resistant wheat germplasm resources since 1983 indicated that resistance to combined and multigene antigens containing two or more genes consistently displayed strong and stable resistance to monogenic anti-source resistance, The resistance of the Pm8 resistance gene and its derivatives has become loss of resistance in recent years. The single source resistance of wheat powdery mildew in China is the main reason leading to the epidemic and worsening of wheat powdery mildew. The current use of multi-gene, multi-source new source is to overcome the single source of the main measures. We will further strengthen the discovery and utilization of micro-efficacy and multi-gene resistance sources, and combine the major-effect genes with the minor-effect genes to maintain long-lasting and stable resistance.