DETERMINATION OF THE SEEDLING REACTIONS OF TWENTY BARLEY CULTIVARS TO SIX ISOLATES OF DRECHSLERA TERES F. MACULATA

Seedling reactions of 20 barley cultivars grown in Turkey were determined under greenhouse conditions to six isolates of Drechslera teres f. maculata, the causal agent of spot form of barley net blotch disease. Isolates were obtained from different provinces of Turkey. Differences among the reactions of the cultivars to the isolates of the fungus were observed. Isolate differences in pathogenicity for each cultivar were also present. The reactions of cultivars to the isolates ranged between susceptible to resistant. Reaction of the cultivar Bülbül 89 ranged between susceptible to moderately susceptible. Barley cvs Obruk 86 and Anadolu 86 exhibited reactions between moderately susceptible-susceptible to moderately susceptible to isolates. Reactions of the cultivars Aydanhanım, Zafer 160, Akar, Keser, Yeşilköy 387, Samyeli, Kaya and Durusu ranged between moderately susceptible-moderately resistant to resistant-moderately resistant. Barley cvs Avcı 2002, Larende, Şahin 91, Bolayır, Olgun, Altıkat, Hilal and Harman exhibited reactions between moderately resistant to resistant to isolates. Cultivar Martı was found resistant to six Drechslera teres f. maculata isolates. Ankara-Nallıhan isolate was the most virulent isolate.