摘要：In many parts of Europe including Austria, common ash,
Fraxinus excelsior is presently affected by a serious
dieback of shoots, twigs and branches. Between June
2007 and July 2008 the presumable ash dieback
pathogen, Chalara fraxinea was found at 31 localities in
Austria. Apart from F. excelsior, the fungus was isolated
at one locality each from Fraxinus angustifolia subsp.
danubialis and Fraxinus excelsior ‘Pendula’. Fungal isolations
have shown that C. fraxinea is associated with
early symptoms of ash dieback. Moreover, the pathogenicity
of this fungus to F. excelsior has been confirmed
in inoculation experiments. We suppose that the presently
occurring ash dieback in Europe is not a complex
disease, but an infectious disease caused by C. fraxinea.
