This article presents results on the influence of the treatment of plum trees during the vegetation period with the biologically active substance Reglalg, microelements (B, Zn, Mn, Mo) and CaCl2 on the quality and degree of resistance to fungal diseases and physiological disorders of fruits during storage period. Fruits stored under AC conditions and those subjected to the action of the ethylene biosynthesis inhibitor Fitomag after harvest, were highlighted by reduced tissue dehydration, minimal amount of fruit affected by fungal diseases and maintaining high commercial aspects.