１９９３～１９９５年采用反应型、严重度和叶位病级三种指标对国内外５６０份小麦新品系的抗白粉病性进行了综合鉴定与筛选。其中，１３４份表现免疫，占２３９％；６７份表现抗病，占１２０％；９６份表现中抗，占１７１％；感病１４６份，占２６１％。等基因系材料的鉴定结果表明，Ｐｍ３ａ、Ｐｍ２、Ｐｍ４ａ仍为高效基因，含Ｐｍ１、Ｐｍ３ｃ和Ｐｍ５的材料均表现感病 From 1993 to 1995, the resistance, powdery mildew resistance of 560 new wheat lines at home and abroad were comprehensively identified and screened by three indexes of reaction type, severity and leaf position. Among them, 134 were immunized, accounting for 23.9%; 67 were resistant to disease, accounting for 12.0%; 96 were moderately resistant, accounting for 17.1%; 146 were susceptible, accounting for 26.1%. The identification of isogenic lines showed that Pm3a, Pm2 and Pm4a were still highly efficient genes, and Pm1, Pm3c and Pm5 were all susceptible