Physiological qualities of a promising fungal strain T-5 Trichoderma sp. - an antagonist of a dry rot pathogen on sunflower

Dry rot is one of the most dangerous and wide spreading disease on sunflower in last years. Due to the growing demand for environmentally friendly production of agricultural products, the demand for competitive microbiological products is increasing. Since 2020, there are studied and developed environmentally friendly microbiological preparations of a multifunctional type of action against the dry rot pathogen on sunflower Rhizopus oryzae Went & Prins. Geerl. at the V.S. Pustovoit All-Russian Research Institute of Oil Crops. The physiological qualities of a promising antagonist strain of the dry rot pathogen T-5 Trichoderma sp. isolated as a result of stepwise screening were studied during stationary cultivation on liquid nutrient media in order to develop elements of a technological regimen for the production of a microbiological preparation in a preparative form wettable powder. Optimal conditions for surface cultivation of the fungus T-5 Trichoderma sp. on a liquid nutrient medium were determined as following: temperature +25 °C; acidic reaction of the medium (pH 3); glucose and starch as carbon source; source of nitrogen nutrition is corn extract. The media by Rudakova and No. 1 were identified as the best complicated liquid nutrient media.