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Presence of the rhizomorphs of Armillaria genus in the managed forest and the virgin forest of "Ravna Vala" at the mountain complex Bjelašnica - Igman.

The paper analyses the presence of rhizomorph fungi of the genus Armillaria in two forest ecosystems: the managed forest and the virgin forest of the mountain complex Bjelašnica – Igman. The objects of the study belong to the forests of Common beech and Silver Fir with Norway spruce which are dominantly represented in the overall forest resources of Bosnia and Herzegovina. The objectives of the study were: (1) to establish the intensity of the presence of rhizomorph of Armillaria spp. in the soil of the researched forest ecosystems, (2) the analysis of significance of the presence of these structures to the health status in the forest and (3) analysis of the influence of the management measures to their incidence. The presence of underground rhizomorph fungi was determined at cross correlations of the square network of spacing of 75 m x 75 m, in three cylindrical soil samples of Ø 15 cm, and 15 cm depth. In addition to the presence of the rhizomorphs, at cross correlations – at standing points, we observed the health status of the trees and bushes and the character of the forest management measures. The results of the research give the insight into the presence of rhizomorphs in the soil of the studied objects and allow considering the significance of micro-stands for the trees vigor and the growth of these structures, which is significant in planning and realization of the management measures in generic eco-systems.