Welcome to TreeAlert
Report suspected tree pests and diseases found anywhere in the UK
Welcome to the updated TreeAlert system.
If you were registered on the old system your details will have been transferred. However you will need to login using your email address. Your password is unchanged.
Forest Research is the research agency of the Forestry Commission and Great Britain’s principal organisation for forestry and tree-related research. We are internationally renowned for the provision of science, research, evidence, data and services in support of sustainable forestry.
Within Forest Research, the Tree Health Diagnostic and Advisory Service provides advice and where possible diagnosis and identification of tree pests and diseases.
Tree Alert is used to gather information about tree health issues across Great Britain. This information supports important tree health monitoring and surveillance work, contributes to ongoing scientific research, and helps to protect the nation's trees.
Tree Health Reports
How to submit a report
What we do with your reports
Pests and Diseases
Submit a Report
Pest or Disease Specific Reports
If you own or manage trees you can request a diagnosis of a pest or disease problem. This may be a chargeable service.
There is more information is available on the Forest Research THDAS page.
Note that some of these links are to external websites for which Forest Research is not responsible for the content. The inclusion of a link to a third party website should not be understood as an endorsement.
Forest Research is the research agency of the Forestry Commission and Great Britain’s principal organisation for forestry and tree-related research.
Tree health diagnostic and advisory service
The Tree Health Diagnostic and Advisory Service provide advice and where possible diagnosis and identification of tree pests and pathogens.
The Chalara Viewer shows England, Scotland and Wales and a grid of 10km squares ('hectads'). Shaded areas show where Chalara dieback has been confirmed to be affecting ash trees in the natural environment.
What you need to make a report
This page helps you to prepare to submit a report by giving an overview of the reporting process and a checklist of essential information that you will need to provide.