The health status of flag leaves and stem bases of hulled oats cv. Chwat grown in the ecological and conventional systems was determined in a field experiment conducted in 2008-2010. The soccurrence of leaf diseases was low. Leaf spots caused by Pyrenophora avenae and Stagonospora avenae covered up to 6% flag leaf area. The applied farming systems had no significant effect on the health status of the flag leaves and stem bases of hulled oat. More numerous colonies communities of Azotobacter and Pseudomonas bacteria and yeast-like fungi were isolated from the grain of hulled oat grown in the conventional system, as compared with the ecological system. Alternaria alternata was the predominant species among the of filamentous fungi. Colonies of pathogens of the genus Fusarium and the species Bipolaris sorokiniana were also isolated. Filamentous fungi, including B. sorokiniana, tended to colonize oats kernels in the ecological farming system.
