Ash dieback, caused by Chalara fraxinea has increasingly been
observed in European countries on ash trees (Fraxinus excelsior)
in the last ten years. Because ash dieback may represent a
serious threat to forest, amenity and nursery ash trees, C.
fraxinea was added to the EPPO Alert List. However, much data is
lacking on its pathogenicity (other biotic and abiotic factors
could be involved in ash dieback), biology, geographical
distribution and economic impact. Therefore EPPO organized a
workshop to bring together researchers and experts in forestry
quarantine to discuss recent research progress and advice NPPOs
how to slow down the spread of this disease. At the kind
invitation of the “Norsk Institutt for Skog og Landskap”
(Norwegian Forest and Landscape Institute) the workshop was
organized in Oslo. A total of 44 experts from 23 countries
participated in this workshop. Warm thanks are due to Mr Bjørn
Økland and his colleagues for the fine organization of the
meeting and their warm welcome in Oslo. The worksh