Heterobasidion parviporum Niemelä & Korhonen and its harmful effect in Han Pijesak spruce forests (picea abies (L.) Karst.)

In this paper damages and financial losses caused by the fungus Heterobasidion parviporum in Han Pijesak spruce forests are presented. The pathogen was found on 48.6% of fresh spruce stumps and trees after felling. The largest number of trees with the occurrence of root rot was in the 30-50cm thickness class, while the height of the decay was 14.9m on average. The use of value of the wood assortment was reduced by 13.8-37.1% due to incidence of decay. The relatively high level of infection of the trees indicated that in the future more attention should be paid to preventive measures. The surfaces of fresh stumps and injuries on trees caused during felling can be protected with the biological preparation Rotstop.