SYNERGISTIC EFFECT OF SPRING BARLEY EXOMETABOLITES IN COMBINATION WITH THE GROWTH STIMULATOR ORACUL MULTICOMPLEX AND THE MICROFERTILIZER VYMPEL 2

One of the current priorities in agricultural biotechnology is to identify mechanisms of action of fungicides of natural origin.Among such mechanisms, plant exometabolites play a crucial role by neutralizing toxins and exoenzymes released by phytopathogenic fungi into the environment, as well as by inhibiting fungal sporulation.The aim of the present study was to investigate the synergistic effect of the interaction between spring barley (Hordeum vulgare L.) exometabolites and two environmentally safe preparations -the growth stimulator Vympel 2 and the microfertilizer Orakul Multicomplex -on the growth and development of the phytopathogenic fungus Fusarium oxysporum.To evaluate the synergistic action of plant exometabolites with these preparations on fungal development, several parameters were measured, including the rate of radial colony growth, mycelial biomass accumulation, and sporulation intensity.The study showed that exometabolites of the spring barley varieties «Sebastian» and «Helios» strongly inhibited Fusarium oxysporum, reducing radial growth, mycelial biomass, and sporulation.The greatest antifungal effect occurred when exometabolites were combined with Vympel 2 + Orakul Multicomplex, which lowered spore viability by 5-6 times compared with the control.The «Sebastian» variety exhibited stronger biochemical inhibition, while «Helios» provided consistent suppression throughout pathogen development.These results highlight the potential of the Vympel 2 + Orakul Multicomplex mixture as an effective bioregulatory component for improving the phytosanitary stability of barley in organic and sustainable farming systems.