The powdery mildew resistance of 809(2009–2013) and 412(2009–2012) new bred wheat varieties(lines) from Henan provincial regional trials was tested using Blumeria graminis f. sp. tritici(Bgt) isolates E09 and E20, respectively. Molecular markers linked to powdery mildew resistance genes Pm2, Pm4 a, Pm8, and Pm21 were used to detect the presence of the individual resistance gene. Among the 908 varieties(lines) inoculated by E09, 199(21.9%) exhibited resistance. Among the 412 varieties(lines) inoculated by E2...