On the longevity of Hymenoscyphus pseudoalbidus in petioles of Fraxinus excelsior.

Summary Air-dried pseudosclerotia produced by the ash dieback pathogen Hymenoscyphus pseudoalbidus (anamorph: Chalara fraxinea) can survive up to 3 months. Under field conditions, they are capable of postponing fructification for 1 year. The implications of this observation for epidemiology and control of ash dieback are discussed.

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