[Mycobiota of Quercus robur L. from the oak forest in the Zhytomyr region].

Different organs of 155 samples of conditionally healthy and sick oaks were examined for mycological contamination. The isolated microscopic fungi belonged to 129 species of different taxonomic groups. The pathogenic complex was represented by 30 fungi species, however most of these species were isolated in single cases. Roots, wood, bast and bark were not affected by the phytopathogenic fungi species that can cause the death of the trees. Mycobiota of branches and sprouts was similar to that ofbark and wood. But frequency of occurence of phytopathogenic fungi was higher on the branches and leaves of drying out and dried oaks. Phytopathogenic fungi Alternaria alternata, Ceratocystis sp. and Trichothecium roseum were isolated more often than others. More often occurrence of Ceratocystis sp.was observed during last two years, they could not be the basic cause of the oak drying. That is also confirmed by similarity of mycobiota of conditionally healthy and drying oaks.