بررسی مقاومت برخی از توده‌های گندم ذخیره بانک ژن گیاهی ملی ایران نسبت به بیماری سفیدک پودری در شرایط مزرعه‌ای ایستگاه تحقیقات زراعی قراخیل

Wheat powdery or superficial mildew caused by Blumeria graminis f. sp. tritici has been one of the most important wheat diseases in the world. It has been prevalent in Mazandaran province that is an important region of epidemic which causes considerable yield damage. Due to preparation and cultivation of resistant varieties is most appropriate method for disease control and Pathogen population always evolved therefore new source of resistance sources should always be investigated. In order to evaluate the wheat land race collection of National Plant Gene-Bank of Iran to Mildew disease 345 accession were evaluated observationally during three years from 1384 to 1387 in Qarakhyl station, Mazandaran. Cultivars Shanghai, Tajan and Bolani were planted with in each block. Bolani sensitive cultivar was cultivated around the blocks as disease spreader on the sidelines. Reaction of under study accessions to powdery mildew were recorded based on Sari and Prescott method base on disease severity and disease incidence. The results indicated that 36 accession were immune, 46accession were resistance, 100 accession were semi sensitive and 163 accession wee sensitive and very sensetive