Antagonistic potential of bacterial strains of the genera Bacillus and Pseudomonas and fungi of the genus Trichoderma isolated in Uzbekistan against Phytophthora infestans

Studies have been carried out on strains of bacteria and fungi isolated in Uzbekistan, which can be used in the biological control of potato late blight. Testing was carried out on two strains of Phytophthora infestans — TVKT-1 and 4MSLK 26 — isolated from affected potato in the Tashkent region of Uzbekistan and in the Moscow region of Russia, respectively. In relation to these strains, the antagonistic activity of strains of fungi belonging to the genus Trichoderma and bacteria of the genera Bacillus and Pseudomonas isolated in Uzbekistan was studied. The maximum antagonistic activity was shown by the Bacillus safensis 3/11 strain, which inhibited the growth of the mycelium of the TVKT-1 strain by 61.9% and 4MSLK 26 by 50%. The strains B. licheniformis 6/25 and Pseudomonas alcaliphila 2/18 were also quite effective. All studied strains of fungi of the genus Trichoderma showed high antagonistic activity; the most active strain was T. asperellum Uz-A4, which inhibited the growth of mycelium of strains TVKT-1 and 4MSLK 26 by 77.1 and 73.1%, respectively. © 2024, Russian Academy of Sciences. All rights reserved.