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Barley is an important crop in Trakia region, Turkey and due to various environmental factors it can suffer some biotic stress and yield loss in the region. This research was carried out in two locations (Edirne and Tekirdağ) of Trakia region during 2013-2014 growing year. The experiment was set up with 25 advanced genotypes in completely randomized blocks with four replications at two locations. Grain yield, plant height, days to heading, leaf rust, net blotch, powdery mildew and relationship among these characters were investigated. According to the results, there was significant difference among genotypes for grain yield, biotic stress factors and other characters. The mean grain yield of the genotypes was 6866 kg ha-1. TEA1619-11 had the highest grain yield with 7667 kg ha-1. TEA2311-19 (7593 kg ha-1) and Harman (7593 kg ha-1) were the other highest yielding genotypes. Due to various environmental conditions, there was significant difference between locations. Mean yield in Edirne location was 7841 kg ha-1 and in Tekirdağ location it was 5891 kg ha-1. TEA1619-8 and TEA1619-9 sister lines had the shortest plant height and early genotypes had higher grain yield. Net blotch (Pyrenophora teres f. teres) is the mainly prevalent disease in Trakya region. Leaf rust and powdery mildew had negative effect and decreased grain yield. TEA1619-12, TEA1619-17, TEA2311-19 and TEA1980-25 genotypes were resistant at both locations. TEA1980-25 was an outstanding line to net blotch, leaf rust and powdery mildew. It was determined that increase of net blotch had negative effect and decreased the grain yield in the genotypes.

Biotic stress factors in barley (Hordeum vulgare L.) genotypes under various environmental conditions in Trakia Region