Biotic relation between Fusarium oxysporum schlecht. and fungi isolated from the substrate of Stewartia pseudocamellia (max.).

The effect of the fungi community colonizing the substrate of Stewartia plants on the growth of Fusarium oxysporum Schlecht. was investigated. The soil samples from 2 years old Stewartia cuttings were taken for analysis in the second decade of October 2002 and 2003, when the symptoms of disease appeared on Stewartia plant. Fungi were isolated from the substrate using the sand method (Mańka K. 1974). Fusarium oxysporum were isolated from root system of Stewartia pseudocamellia plant. The isolates selected for the investigation proved pathogenic influence on Stewartia in an infection experiment. For estimation of biotic effect of saprobiotic fungi community on Stewartia pathogen F. oxysporum the biotic series method (Mańka K. 1974) was applied. The results showed that species of genera: Penicillium and Trichoderma were the most frequent in the community of fungi in the substrate. Both fungi communities of these fungi could not limit the growth of investigated pathogen F. oxysporum. It showed negative ABSTRACT biotic effect. The strongest antagonistic effect displayed Trichoderma viride and Trichoderma harzianum.