Such fungal diseases as monilia, blue mold, gray mold wilt, bitter rot, scab, Alternaria spot, Fusarium rot, Phoma fruit spot, kernel rot were recorded during longterm storage. Harmfulness of some diseases depends on variety and biological peculiarities of fruit, growing location, climatic factors. Such species as Monilia, Penicillium, Botrytis, Gloesporium, Alternaria, Phoma, Cladosporium, Fusarium, Venturia are considered to be the main causative agents spread in central Russia. Penicillium expansum, Botrytis cinerea, Alternaria alternate, Gloeosporium fructigenum, Venturia inaequalis are the most aggressive ones. Complex system of relationship between pathogen and host results in the development of fungal diseases. Apples fully meet requirements of mycopathogenes in nutrients that are mostly secondary nonspecific necrotrophs.