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Abstract
In Egypt, wheat (Triticum aestivum L.) is one of the most important cereal crops. Stem rust of wheat caused by Puccinia graminis f.sp. tritici is a widespread disease in Egypt attacking wheat plant causing a great losses in the yield. This work was carried out to make further studies to control stem rust of wheat. Race identification during different seasons using the classical method of identification was occurred indicating that race 11 was the most frequent one while pathotype PTTTT was the most frequent pathotype during 2003/2004 growing season, using the recent method of identification. Also, Gene efficiency and slow-rusting in many commercial wheat cultivars were evaluated. RAPD technique was used to determine the differences in DNA for some wheat cultivars evaluating the similarity between cultivars and between some races. Effect of spraying wheat plants in both seedling and adult stages with different chemical compounds.