Introduction. Potato Solanum tuberosum L. is important agricultural crop. It takes im-portant place in food list for men food. It takes important place as a feed for animal husbandry and industry. The potato diseases, causative agents are different phytopathogenic organisms (fungi, viral, bacterium) is important problem for potato study today. Alternaria blight and late blight are dangerous diseases of fungi diseases. They take serious spread every year in Ukraine territory. They may cause serious losses for potato growing. The decrease quanitity of yield goods quality decrease, storage observed in recent years. The areas defeating happens through the reasons of farming culture decrease. Among them are: non-control fertilizers input and systems of potato nourishing, non- following the agrotechnical requirements for crop rotation optimal terms for planting, absence of quality seeds material, unfavorable weather conditions and defeating pathogen organisms of fungi nature.  The agricultural crops protection from complex of pests is important task for agricul-ture. The agriculture losses 50-60% from the yield every year. The main crops’ yield may increase in terms of soils fertility and favorable climatic terms through the development of biological farming [1, 3, 4]. There are immunomodulators for this aim. They used as stress adaptogens, activators for growing and development. They enforce plants’ root system, nor-malize soil’s content and increase absorption of nutritious matters of crop. Purpose is to determine phytohormones impact on potato fungi development in area of Ukr SRPQS IPP NAAS.