During recent years, a new disease of Siberian fir (A. sibirica) emerged in Central Siberia, exhibiting symptoms of stem/branch deformation, cambium necrosis, and dieback of branches and twigs, the causal agent remaining unknown. The aim was to identify agent of the disease and to investigate its pathogenicity to A. sibirica and Norway spruce (Picea abies). Symptomatic tissues of fir were subjected to pure culture isolation of anticipated pathogen(s). Obtained isolates were subjected to molecular identification, phylogenetic analyses, and pathogenicity tests with A. sibirica saplings, and seeds and seedlings of A. sibirica and P. abies. The study demonstrated that, (i) most commonly isolated fungus from canker wounds of A. sibirica exhibited Acremonium-like anamorphs; (ii) phylogeny demonstrated that investigated fungi belong to genus Corinectria, but are genetically well separated from other worldwide known Corinectria spp.; (iii) one species of isolated fungi has the capacity to cause the disease and kill A. sibirica saplings and seedlings, but also seedlings of P. abies. Guidelines for future research were defined in order to generate needed information on species description, its origin and ecology, and estimation of potential risks upon the eventual invasion of the pathogen to new geographic areas, in particular of Europe.

5 N Sukachev Institute of Forest SB RAS Laboratory of Reforestation Mycology and Plant Pathology Krasnoyarsk 660036 Russia

5 N Sukachev Institute of Forest SB RAS Laboratory of Reforestation Mycology and Plant Pathology Krasnoyarsk 660036 Russia Reshetnev Siberian State University of Science and Technology Department of Chemical Technology of Wood and Biotechnology Krasnoyarsk 660037 Russia

Mendel University in Brno Department of Forest Protection and Wildlife Management Zemedelska 3 61300 Brno Czech Republic

Swedish University of Agricultural Sciences Department of Forest Mycology and Plant Pathology P O Box 7026 SE 75007 Uppsala Sweden

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