POSSIBLE CONTRIBUTION OF PHYTOPHTHORA SPP. IN DECLINE OF NORWAY SPRUCE (P. ABIES (L.) H. KARST.) STANDS IN VITOSHA MOUNTAIN

In recеnts years lots of evidences were accumulated regarding involvement of Phytophthora spp. in the descent of important forest tree populations across Europe and worldwide. In our survey we explored the possibility (hypothesis) fungi-like pathogens from genus Phytophthora to be involved in the deteriorating processes in Norway spruce (Picea abies (L.) H. Karst.) stands in Vitosha Mountain. Two Phytopthora species (P. cambivora (Petri) Buisman) and P. cryptogea Pethybr. et Laff.) were isolated and identified on the basis of morphological, cultural and molecular traits. Both species are known as important pathogens with a broad range of host species. They are also recognized as causing agents of the destructive ‘Ink disease’ on Castanea sativa, which is reported to resurge in Europe. In many cases of descent of forest tree populations across Europe Phytophthora spp. are considered as primary invaders. From this point of view, an assessment of the risk these pathogens to be involved within the range of factors negatively affecting the ecosystems in Vitosha Mountain, is urgently needed.

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