Biostimulants Managed Fungal Phytopathogens and Enhanced Activity of Beneficial Microorganisms in Rhizosphere of Scorzonera (Scorzonera hispanica L.)

The principles of good agricultural and horticultural practice, considering both environmental protection high yielding plants, require modern cultivation methods. In agriculture, it is possible to use biostimulants that protect the soil against degradation plants phytopathogens stress. purpose 3-year field laboratory studies was determine effect Trichoderma harzianum T-22 other on health status scorzonera (Scorzonera hispanica L.) microorganism populations in rhizosphere this plant. For purpose, Biosept Active (a.s.—grapefruit extract), Timorex Gold 24 EC (based tea tree oil), Trianum P (spores Rifai T-22) Zaprawa Nasienna T 75 DS/WS fungicide (a.s.—tiuram) were applied for pre-sowing seed dressing cv. “Duplex”. number seedlings determined during three growing seasons. each year study, mycological analysis seedling roots after harvest conducted establish quantitative qualitative composition fungi colonizing these parts. Moreover, microbiological analyses rhzisphere served as basis total population bacteria (including Pseudomonas sp. Bacillus sp.). Antagonistic activity sp., based tests selected soil-borne fungal pathogens (Alternaria scorzonerae, Fusarium culmorum, oxysporum, Rhizoctonia solani). experiments showed most effectively protected infection by Alternaria alternata, A. Neocosmospora solani, spp., Sclerotinia sclerotiorum, Botrytis cinerea. treatments with or larger than experimental treatments. A reverse relationship observed fungi. application grapefruit extract, oil increased antagonistic saprotrophic pathogens, especially summary, Active, can be recommended plant Scorzonera cultivation.