STUDY OF BIOCIDAL PROPERTIES IN EXTRACTIVE SUBSTANCES FROM CONIFEROUS WOOD GREENERY

To control plant pathogens, extractive substances isolated from conifer raw materials can offer an environmentally friendly and sustainable alternative to agrochemicals. The article presents the results of studying the extractive substances from coniferous wood greenery (WG) extracted by the emulsion extraction method. Samples of wood greenery extracts from spruce, pine and larch were tested for their biological effect on the growth of phytopathogenic fungi Fusarium avenaceum, F. oxysporum, F. culmorum, F. proliferatum, Bipolaris sorokiniana, Alternaria sp., Parastagonospora nodorum Н9 and bacteria Erwinia rhapontici, Pseudomonas cepacea, Curtobacterium flaccumfaciens G29r4, Bacillus sp. G29r3, Bacillus aryabhattai G11r3, Pedobacter agri, Clavibacter michiganensis under in vitro conditions. The obtained results indicate the presence of antibacterial and antifungal activity in the studied samples of coniferous extracts. The working concentrations that provided the most efficient growth suppression of phytopathogenic bacteria and fungi were identified. The phenomenon of the maximum inhibitory activity of the extracts at low concentrations followed by the attenuation of their action with increasing doses was revealed.