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Symptoms of Hymenoscyphus pseudoalbidus infection on Fraxinus excelsior. (a) Mature tree showing extensive dieback (courtesy of O. Holdenrieder, ETH Zurich, Switzerland); (b) shoot dieback on coppiced ash in Norfolk; (c) lesions on foliage of weeping ash (F. excelsior var. pendula) in October (Czech Republic); (d) lesion extending from infected axillary node on 2‐year‐old ash stem.
