Suppression of damping-off on pepper caused by Pythium ultimum Trow and Rhizoctonia solani Kuehn by some new antagonists in comparison with Trichoderma harzianum Rifai
1989
Turhan, G. (Ege Universitesi, Bornova-Izmir (Turkey). Ziraat Fakueltesi) | Turhan, K.
Pot experiments were designed to evaluate the efficacy of Streptomyces nobilis, S. ochraceiscleroticus, Neocosmospora vasinfecta var. africana and Acrophialophora levis isolates in reducing the damping-off on pepper in comparison with a strong mycoparasitic isolate of Trichoderma harzianum. Two pathogenic and five potential antagonistic isolates were grown separately in flasks containing a mixture of sand-perlite-corn meal and potato-sucrose broth for 4 weeks. Soil infestation was achieved by mixing these stock cultures separately into the pot soils. Disease incidence was expressed as the percentages of dead seedlings in each pot and the protective values of the antagonists were calculated according to Abbott formula. Results indicated that all of the five test isolates have provided the seedlings with protection of statistical value against Pythium ultimum and Rhizoctonia solani reducing disease incidence between 28.14 to 79.14 per cent and 22.76 to 66.83 per cent, respectively. However, T. harzianum isolate proved to be the least effective antagonist against both pathogens
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