Genetic Analysis and Chromosomal Location of Two New Genes for Resistance to Powdery Mildew in Wheat (Triticum aestivum L.) Monitoring of the virulence of Erysiphe graminis f.sp.tritici in different ecological areas of Shanxi Province Analysis of Resistance to Powdery Mildew in Wheat Based on Expressed Sequence Tags (EST) Technique Cloning of a TCTP Gene in Wheat and Its Expression Induced by Erysiphe graminis MONITORING OF THE VIRULENCE POPULATION OF ERYSIPHE GRAMINIS F. SP. TRITICI