ارزیابی بیماری‌های بذر زاد گندم در سیستم‌های رسمی و غیر رسمی تولید بذر در سه استان کشور

in order to evaluation of seed-borne fungi diseases in formal and informal wheat seed production fields, a research was carried out in laboratory of Seed and Plant Certification & Registration Institute (SPCRI), Karaj, Iran, 2011-12. The studied factors were consisted of two seed production systems (formal and informal) in four districts of three provinces (Tehran, Kermanshah and West Azerbaijan). For conducting the research, 24 seed samples were collected from harvested seed loads. Experimental data was conducted in a split plot based on completely randomized design. Tilletia laevis, Ustilago tritici, Fusarium graminearum, Fusarium culmorum, Fusarium avenaceaum, Fusarium poa, Bipolaris sorokiniana and Alternaria alternate were the most important fungal species detected in the samples. The seed production systems were different in aspect of infection with seed borne disease but not significant, in a way that the percent of infection in formal seed system was lower than informal system. It seems that no meaningful difference between the systems can be related to proper management and seed dressing in informal seed system. Such attempt on seed mycoflours is necessary for national seed health standards and disease management programs.