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Part of the Aston Rowant National Nature Reserve, an area of chalk downland and beech woodland in rural Oxfordshire. A sign in the photo explains that the Chalara ash diebark is a disease which is affecting woodland in Aston. It is not harmful to humans or animals but can kill ash trees. Symptoms include suspended dead branches, blackening of leaves on trees and discoloured stems, often in a diamond shape where a leaf was attached.