Phytosanitary effects of Bacillus subtilis as biocontrol agent
1992
Bochow, H. (Humboldt Univ. Berlin (Germany). Fakultaet fuer Landwirtschaft und Gartenbau)
A strain of Bacillus subtilis, produced by FZB Biotechnik GmbH Berlin, is effective to biocontrol different fungal soil-borne diseases in a numbers of host plants. Also in hydroponic (NFT), introductions of B. subtilis spores reduced infections of tomatoes by Phytophthora nicotianae var. nicotianae, inoculated into the system. Treated plants were better in growth and biomass production. Detailed studies on B. subtilis activities with inhibition of Alternaria radicina growing from carrot seeds indicated dependences of antifungal effects by higher temperatures. In axenic cultures with carrot seedlings and A. radicina applications of B. subtilis resulted in significant disease reducing and plant growth promoting effects, compared with lower and only antifungal actions by 50 ppm of the fungicides captan, iprodion or vinclozolin. B. subtilis root treatments of tomato seedlings induced furthermore a systemic effect, not caused by an uptaken and translocation of produced antifungal compounds (antibiotics). So, post-cultivated stem cuttings from bacterial treated plants have shown an increase in rooting and a decrease in symptoms after inoculations with Fusarium oxysporum f. sp. radicis-lycopersici. Consequently, B. subtilis has a number of different plant health supporting activities.
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