Objective. To study the bactericidal activity of a number ofpreparations obtained by different technological processes from plant materials of individual parts of the Green walnuts on several certified model strains of bacteria that differ in biological diversity. To determine the disinfectant capabilities of these preparations in the absence of antagonistic and synergistic effects of the full range of mixtures of typical banal microflora of pig farms. Methods. The following methods were used: biological and botanical to determine the phase of vegetation of Juglans regia in the selection of raw materials from different parts of the plant; biochemical and chemical in the process of preparation and isolation of the active substance from these samples and their purification from ballast fiber by maceration and extraction, using a number of devices and equipment; microbiological for the preparation of standardized culture media with selective properties that correspond to the peculiarities of reproduction, development and distribution of selected model strains. Surface inoculation was performed on liquid and agar-based culture media in test tubes and Petri dishes using the standard streak plate method with a microbiological loop. Subsequently, standard incubation at 37°C for 24 hours was performed. Results. It was found that the greatest bactericidal and fungicidal activity, and therefore potential effectiveness as a possible disinfectant in organic pig production technology, was found in extracts of phytomaterials of Juglans regia L - potential disinfectants No. 2 (extractant - 5 % acetic acid, wax-ripening nut) and No. 4 (extractant - 20 % alcohol, wax ripening nut) - brought to 5 % alcohol after obtaining the primary extract. Conclusions. According to the results of studies on certified strains of microorganisms, it was found that the studied extracts have a significant effect on representatives of enterobacteria, a weak effect on spore forming bacilli. Keywords: organic pig production, bactericidal activity, phytodesinfectant, certified test cultures, Salmonella typhimurium, Bacillus subtilis, extract, walnut.