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Chalara dieback of ash - winter symptoms
Video • 00:01:35
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Chalara dieback of ash - Spring symptoms
Video • 00:02:28
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Chalara ash dieback poster
PDF • 721 KB
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Pests and diseases
Emerald Ash Borer
Native to Asia and Eastern Russia, the emerald ash borer is a threat to our already vulnerable ash trees.
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Blog
Host of the Month - Ash
Matt Parratt, Observatree Scientific Coordinator, looks at common ash, chalara ash dieback, and emerald ash borer
Matt Parratt • 04 Dec 2023
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Blog
Host of the month - Ash
Matt Parratt takes a close look at Common ash, Chalara ash dieback, and Emerald ash borer.
Matt Parratt • 20 Nov 2025
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Blog
Do we still need to record and report Chalara dieback of Ash?
Matt Parratt discusses the prevalence of Chalara dieback of Ash and offers some guidance on reporting this widespread disease.
Matt Parratt • 27 Nov 2025
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Blog
Ash Dieback in the National Trust
Ash is one of our most important tree species both ecologically and culturally, and is generally considered to be the third most common tree in British woods, comprising around 12% of woodland tree cover.
Luke Barley • 23 Aug 2021
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Ash Dieback detailed information
External link
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Pests and diseases
Chalara Dieback of Ash
A chronic fungal disease believed to have originated in Asia, now widespread across Europe.