Although common wheat is grown in different ecological and geographical areas, which indicates the high adaptive potential of this crop, in recent years the harvest is often compro-mised quantitatively and qualitatively due to various ecological disturbances – extreme tem-peratures, droughts that predispose to diseases of various fungal diseases, spread in all wheat-growing countries, having a significant negative impact on grain yield and quality. Among the many fungal species that populate the soil, about 8,000 species of fungi and oomycetes are associated with the plant diseases, reduced fruit set and threat to food security [1]. Root rot is considered a complex disease, dominated by different pathogens on different surfaces or different pathogens in the succession of the ontogenetic stages of plants. As these diseases present long-term problems for many cereal-growing countries, in order to obtain high and quality crops for wheat and barley, extensive research has been initiated on the pathogens involved, the environmental factors associated with these diseases and crop losses. Determining the composition of fungal species that cause one disease or another in crop plants is of great importance for the development of the right protection measures and serves as a methodological support in pathogen resistance screening systems. Because the host-plant-fungus relationship is often trophic, it is interesting to identify the particularities of the com-position of causative agents in plant ontogenesis – a factor on which the nutrient biochemical substrate for the pathogen significantly depends. Purpose: Establishing of the role of genotype factor and environmental conditions in the manifestation of common wheat resistance to fungal pathogens.