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Chalara fraxinea (teleomorph: Hymenoscyphus albidus) is known as a serious pathogen of Fraxinus excelsior, causing massive dieback of trees in Europe. The fungus is able to cause latent infections, and has been previously detected as an endophyte in asymptomatic tissues. Chalara fraxinea is a slow grower in culture, and is thus likely to be overgrown by faster growing fungi whenever pure culture isolations...
Investigation of secondary metabolite production of Chalara fraxinea, the fungus responsible for dieback of ash, led to the isolation of the phytotoxin viridiol and the fungistatic compound viridin. Viridiol showed necrotic activity towards ash‐seedlings.