Forestry and Tree Health Resources
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Information including symptoms and distribution about acute oak decline disease of oak (Quercus species), characterised by stem bleeding
Oak trees in Britain have long suffered from dieback and decline disorders, but a disease called acute oak decline has been causing particular concern since the first few years of the 21st century. A typical symptom of the disease is dark, sticky fluid bleeding from small cracks in the bark...
AOD symptoms Descriptions and photos
Posters, presentations, films, webinars, links and research updates about oak decline
Information about the incidence and distribution of acute oak decline (AOD) in Great Britain, and how it is obtained.
Using tree ring measurements (dendrochronology) and stable isotope analysis, the research aims to examine the stem growth and tree health histories of Acute Oak Decline (AOD)-affected trees, to look for evidence of predisposition to AOD, the impact of AOD on recent growth, and correlation with A. biguttatus attack.
Teamwork between Forest Research, Bangor University and others has for the first time, tracked down the cause of the stem bleeding symptoms of acute oak decline (AOD). Using the latest scientific methods they have revealed a multi-bacterial cause of the stem bleeding and pioneered novel methods for analysing the causes...
The lifecycle of Agrilus biguttatus: the role of temperature in its development and distribution, and implications for Acute Oak Decline
• Novel dendrochronological modelling was developed to explore oak stem growth trends. • Trees with long-term AOD symptoms may have been predisposed many decades earlier. • Diseased trees struggle to take advantage of favourable growing conditions. • Historic episodes of stress may impact the future resilience of oaks to disturbance.
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