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Hymenoscyphus fraxineus

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Hymenoscyphus fraxineus is an Ascomycete fungus that causes ash dieback, a chronic fungal disease of ash trees in Europe characterised by leaf loss and crown dieback in infected trees. The fungus was first scientifically described in 2006 under the name Chalara fraxinea. Four years later it was discovered that Chalara fraxinea is the asexual (anamorphic) stage of a fungus that was subsequently named Hymenoscyphus pseudoalbidus and then renamed as Hymenoscyphus fraxineus. Trees reported dying in Poland in 1992 are now believed to have been infected with this pathogen. It is now widespread in Europe, with up to 85% mortality rates recorded in plantations and 69% in woodlands. It is closely related to a native fungus Hymenoscyphus albidus, which is harmless to European ash trees. According to…

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