Impacts of Ash Dieback Hymenoscyphus fraxineus (Chalara) on priority lichens and potential mitigation options (NECR428)

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The rapid spread of ash die-back Hymenoscyphus fraxineus is resulting in the loss of ash trees at a landscape-scale. The impact of this loss on ash-dependant lichens has hitherto been unknown. The risk from ash dieback was assessed for 20 Section 41 species with varying dependencies on ash. Notably 8 species are considered to be at high, or very high risk of extinction from the loss of ash.

Potential mitigation approaches to reduce the impact of ash die-back on lichen are evaluated. Five case-studies are presented which discuss the application of these approaches to specific sites and issues. These are Gowbarrow/Glencoyne Park in Cumbria, Bovey Valley in Devon, Horner in Somerset, Dunsland Park in Devon and Arlington Court in Devon.

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NECR428 Edition 1 Impacts of Ash Dieback Hymenoscyphus fraxineus (Chalara) on priority lichens and potential mitigation options, PDF, 30.0 MB 2022/09/06