Fungal pathogens of mold of winter wheat grains in Rostov region

Abstract

Long-term monitoring of the colonization of winter wheat grain by fungal mold pathogens that negatively affect the quality of grain during storage, reducing the quality of seed material, food grains and forage, showed that a high level of occurrence on the grain ofRostov winter wheat samples for the period 2014–2021 was manifested by mold fungiMucorspp.,Aspergillusniger,Aspergillusglaucus,Aspergillus flavus, species of the genusPenicillium.Relatively low occurrence was observed inRhizopus nigricansandCladosporium herbarumspecies.Mold pathogens are producers of the most dangerous mycotoxins: ochratoxinA(species ofPenicillium,Aspergillus niger,A. glaucus), aflotoxinB1 (A.flavus), rhizonins (Rhizopusspp.), etc.In the regions ofSouthernRussia, with severe drought in the soil and on the lower parts of plants, the accumulation of the fungusPenicillium purpureogenumis often noted, for some time it could become dominant.When restoring the level of moisture supply, a decrease in the occurrence ofP. purpureogenumwas observed, often to zero, and an increase in the occurrence of mucor fungi (Fusarium solani,F.semitectum), non-circulatingMycelia sterilia fungi, etc., a noticeable increase in the total density of fungal colonies.The highest level of external infection of grain was due to colonization of grain by fungi from thePenicilliumgroup, as well asA. glaucusandA. niger, the highest level of internal infection was caused by thePenicilliumgroup,Rhizopus nigricans,A. niger.The dominance of external infection over internal infection was observed during colonization by penicilli and aspergillus, the dominance of internal over external infection by rhizopus and cladosporium.