Abstract: In this experiment the screening material has been divided into three categories: I) Nine monosomic lines (1A, 1D, 2A, 2D, 3B, 4A, 4B, 5B, 7D) have shown resistance against powdery mildew, but still some plants were attacked by this disease. ii) Five monosomic lines (2B, 3D, 4D, 5D, 6A) have indicated susceptibility against this disease, but still some resistant plants were there. iii) The third group has included the monosomic line 7B, where all the plants were attacked by disease. The line 7B and the variety “poros” exhibited a 100 % susceptibility against powdery mildew, where all the plants (7B-119 and poros-200) tested were attacked by this disease. “M30” has shown a 100 % resistance against this disease, where all the plants (200) responded positively to this disease.