Articles
SUSCEPTIBILITY OF FRAXINUS SPECIES TO ASH DIEBACK CAUSED BY CHALARA FRAXINEA©
Article number
1014_46
Pages
201 – 203
Language
English
Abstract
Ash dieback caused by the fungus Chalara fraxinea was first identified in 1990 on Fraxinus excelsior in southern Sweden and Poland.
At that time, little information was available about this new disease.
Since then a sexual form of the pathogen has been isolated and named Hymenoscyphus pseudoalbidus.
First symptoms in seed-raised nursery stock normally occur in the late summer of the second growing season.
Leaves turn brown but an abscision layer does not form and they remain on the plant.
During the autumn the 1-year branches show discoloration from yellow to dark brown.
Grading-out unhealthy plants in autumn is impossible, because the symptoms continue to appear and develop through winter.
At that time, little information was available about this new disease.
Since then a sexual form of the pathogen has been isolated and named Hymenoscyphus pseudoalbidus.
First symptoms in seed-raised nursery stock normally occur in the late summer of the second growing season.
Leaves turn brown but an abscision layer does not form and they remain on the plant.
During the autumn the 1-year branches show discoloration from yellow to dark brown.
Grading-out unhealthy plants in autumn is impossible, because the symptoms continue to appear and develop through winter.
Authors
H. Lösing
Keywords
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