We use some essential cookies to make this website work.
We’d like to set additional cookies to understand how you use forestresearch.gov.uk, remember your settings and improve our services.
Preparing to search
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 on the trunk of the tree. This stem bleeding can be extensive, with as many as 20 or more bleeding patches on an infected tree, and the canopy can become thin as the tree approaches death. Some trees die within four or five years of the onset of symptoms. Our research has revealed that three previously undescribed bacteria are involved. The condition appears to be most prevalent in warmer parts of England and Wales that are prone to drought and atmospheric nitrogen pollution. Woodland managers should survey, record and monitor infected trees and take the appropriate recommended action, which might include felling diseased oaks. Felled material should not be removed from affected sites unless the bark and sapwood have been removed and destroyed. This publication provides more-detailed advice and guidance on managng the disease.
Cookies are files saved on your phone, tablet or computer when you visit a website.
We use 3 types of cookie. You can choose which cookies you're happy for us to use.
These essential cookies do things like remember your progress through a form. They always need to be on.
We use Google Analytics to measure how you use the website so we can improve it based on user needs. Google Analytics sets cookies that store anonymised information about: how you got to the site the pages you visit on forestresearch.gov.uk and how long you spend on each page what you click on while you're visiting the site
Some forestresearch.gov.uk pages may contain content from other sites, like YouTube or Flickr, which may set their own cookies. These sites are sometimes called ‘third party’ services. This tells us how many people are seeing the content and whether it’s useful.