One of the most important tasks after harvesting fruits is to inhibit their maturation to increase shelf life and maintain their quality. Lately, a wide use has the "Phytomag" ethylene synthesis inhibitor [1methylcyclopropene (1-MPC)], which even at low doses (at a level of 0.5-1.0 ppm) has a very high inhibitory property strong. The preparation was synthesized in the Russian Federation. The fruits of the late varieties of apples were the object of research: Golden Delicious, Florina, Idared and Renet Simirenko. The experiments were carried out under the conditions of the experimental base "Carpotron" of the Institute of Genetics, Physiology and Plant Protection of the Academy of Sciences of the Republic of Moldova. Fruits were treated with the preparation "Phytomag" and then stored for 150 days at a temperature of 1 ° C and a relative humidity of 85-90%. Untreated fruit was maintained under the same conditions. During the storage period, several biochemical and physiological indices were examined, including: emission of endogenous ethylene, organic acids, weight loss, hardness, fungal diseases, physiological disorders. The results obtained demonstrate the effectiveness of the preparation “Phytomag” after processing of apple fruits. The fruits researched during storage recorded weight loss, the most insignificant being recorded on the fruits treated with the preparation "Phytomag". Thus, the lowest weight loss was recorded by the fruits of the Idared variety (2.47%). In the case of untreated fruit, less losses were also recorded for the fruits of Idared (3.13%). In addition to the above indicators, firmness was also determined, the value of which was higher for Fytomag treated fruit. The best results were observed in fruits of the Florina variety - 6.93 kg / cm2. The efficacy of the preparation was determined and in the case of standard fruit. It was found that the least affected by fungal diseases and physiological disorders were fruits treated with "Phytomag", especially Idared fruit - 99.96% unaffected fruit. In the control variant, the quantity of unaffected fruits was much lower, constituting 0.58-12.83% less than in the variant of applying the "Phytomag" preparation. Among the fungal diseases that affected apple fruit were more Penicillium expansum Link and Botrytis cinerea Pers, and more common physiological disturbances were Bitter pit and Internal breakdown. The storage method by applying Fitomag will help slow down maturing, maintain taste, reduce losses due to functional disorders and fungal diseases, and increase competition in the food market.