Search Observatree
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Host of the Month: Oak and Acute Oak Decline - April 2026
PDF • 1.78 MB
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Identifying bleeds on a tree part 3 - Other causes and reporting
Video • 00:07:10
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Chalara dieback of ash - Animation from RBG Edinburgh
Video • 00:02:36
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Chalara dieback of ash - Life cycle and symptoms
Video • 00:04:50
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Sweet chestnut blight contingency plan
External link
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Oak lace bug on a leaf
Video • 00:00:35
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Laypersons Report French
PDF • 3.26 MB
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Phytophthora ramorum poster
PDF • 803 KB
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Bronze birch borer poster
PDF • 3.50 MB
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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