Wheat powdery mildew (Blumeria graminis f. sp. tritici, Bgt) has become a principal disease occurring annually in Egypt followed by rusts which have been effectively controlled using resistance genes. Survey for fresh infected samples of powdery mildew was collected from fields of farmers and International Wheat Programs of five provinces, i.e., El-Gharbia, Kafr Sheikh, Dakahlia, Menoufia and Behera in Delta Egypt during 2019 and 2020 growing seasons. A total of 37 powdery mildew genes (Pm) including 16 known differentials were evaluated at the seedling stage for resistance and to identify the Bgt pathotypes prevailing in Delta Egypt. 84 isolates of powdery mildew, seven pathotypes were identified in the 2019 season, i.e., BIOE, FOOE, MOIE, MOOE, POEE, OOOE, POCE, while six pathotypes: MOOE, MMOE, COOE, CKKE, MOKE and HOOE were identified in the 2020 season. The pathotype MOOE showed the highest frequency of occurrence during the two seasons (62.16% and 62.18%), respectively. No virulence frequencies were detected in 27.02% of the tested Pm-genes, i.e., Pm11, Pm13, Pm16, Pm24, Pm25, Pm29, Pm32, Pm35, Pm36 and Pm37 during the two seasons of the study. Twenty-four of the 37 Pm-genes showed 5.56 up to 100% virulence frequencies during the two seasons of study, whereas three of the Pm-genes, i.e., Pm1b, Pm12 and Pm34 showed some fluctuations in virulence frequency with values of 16.67% in 2019 season, and 5.55%, 13.89% and 27.78% virulence frequencies in 2020, respectively.

小麦白粉病（白粉菌F。菌属小麦，白粉菌）已成为每年在埃及发生的主要疾病，随后由已使用抗性基因得到有效控制生锈。在2019年和2020年生长季，从埃及三角洲的El-Gharbia，Kafr Sheikh，Dakahlia，Menoufia和Behera等五个省的农民和国际小麦计划的田间收集了新鲜感染白粉病样本的调查报告。在苗期评估了37个白粉病基因（Pm）（包括16个已知的差异）的抗性并鉴定了Bgt。埃及三角洲流行的致病型。在2019年季节中，发现了84种白粉病菌，鉴定了7种病态，即BIOE，FOOE，MOIE，MOOE，POEE，OOOE，POCE，而6种病态：MOOE，MMOE，COOE，CKKE，MOKE和HOOE被鉴定2020赛季。在两个季节中，MOOE的发病率最高（分别为62.16％和62.18％）。在测试的Pm基因中，即Pm 11，Pm 13，Pm 16，Pm 24，Pm 25，Pm 29，Pm 32，Pm 35，Pm 36和Pm中27.02％未检测到毒力频率在研究的两个季节中为37岁。37个Pm基因中有24个在两个研究季节中显示出5.56高达100％的毒力频率，而Pm 1b，Pm 12和Pm 34中的3个Pm基因在毒力频率上有一些波动，其值2019赛季的毒力频率分别为16.67％和2020年的5.55％，13.89％和27.78％。