CHANGE OF ROOT ROT CAUSATIVE RATIO ON SPRING WHEAT ON DIFFERENT SOIL TYPES

The content of the article includes the results of phytosanitary monitoring of spring wheat crops in various soil regions of the Republic of Mordovia for the presence of a pathogenic complex of root rots. In the course of the studies, the dependence of the damage to spring wheat due to the site of infection of the plant organ was revealed. Their occurrence and species structure depended on the type of soil. A direct connection was revealed to increase the occurrence of Bipolarissorokiniana species on chernozems, and Fusariumspp on sod-podzolic soils. Numerous sampling and data processing have demonstrated the diverse structure of fungal communities belonging to root rot pathogens. During the research, 6 species of the genus Fusarium of the local population were first identified. A comparative assessment of the occurrence of species of the genera Fusarium and Helminthosporium showed an increase in the proportion of dominant typical species on sod-podzolic and chernozem soils and a decrease in the presence of rare and random species in them. On gray forest soils, there were no obvious changes in the composition of the pathogenic complex of root rots.