Summary Hymenoscyphus fraxineus was isolated from four leaf rachises with necrotic lesions of flowering ash (Fraxinus ornus) seedlings, which had been planted on a forest site in Austria where they were exposed to a massive natural infection pressure. This represents the first definite report of natural infection of this ash species by the ash dieback pathogen.
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Kirisits et al. (2015) studied this question.
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