Fungi on stems and twigs in initial and advanced stages of dieback of European ash (Fraxinus excelsior) in Poland

摘要: F. excelsior is affected by dieback in the major part of its natural geographical range Europe, which results economic and ecological losses. The disease caused ascomycetous fungus Hymenoscyphus fraxineus, a pathogen introduced to Europe most probably from East Asia. This paper presents data on fungi identified trees representing two different stages ash Poland. Fungal communities were initial necrotic lesions living stems twigs using classical method isolation malt extract agar morphological molecular analyses. In dead apical parts twigs, microscopic analyses fruit bodies formed situ. Seventy-one fungal taxa found 720 samples with symptoms or advanced necrosis. common detected each forest site was fraxineus (59.2 % analysed samples). Other frequently isolated included Alternaria alternata, Diaporthe eres, Diplodia mutila, Fusarium avenaceum, lateritium Phomopsis spp. Fruit produced mostly Lophiostoma corticola, spp., Sirodothis sp. Valsa cypri. sites similar, as shown high Sorensen similarity index values. Greatest variation community structure at stage realized D. mutila Data show close affinity certain site, suggesting relatedness. effects distribution invasive H. other sporulating diseased are discussed.