اعلانات هامة

The study was conducted in Faculty of Agriculture in Deir Ezzor during the agricultural season 2011-2012 on some varieties of wheat cultivars,two durum (Dohma1, Sham7)and two bread (Sham8, Bohoth6) in potsystem. Aiming to assissing abilities these varieties to resistance the disease yellow rust Puccinia striiformis Westf.sp.tritici, and reaction of the plant against the infection according to the degree of its sensitivity to the disease. Disease severity (DS) was estimated using a scale of 0-100. The results of tested the sensitivity of these varieties showed that all the varieties mentioned are able to be naturally and unnaturally infected by the infectious fungus.There was a defferances in its ability to tolerancethe disease, and defferent in its severity and percentage infection by infectious fungus, although defferent in its reactions against it, and it is reaction: Sham8 moderately resistant(MR) in natural conditions, to resistant(R) in unnatural  conditions. Bohoth6 and Dhoma1 resistant(R)in two conditions. Sham7 variety moderately susceptible(MS) in natural conditions to moderately resistant(MR) in unnatural  conditions.                                                                  

Key words: Wheat, Yellow rust, Resistance.