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Welcome to TreeAlert

Report suspected tree pests and diseases found anywhere in GB

About

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

How to submit a report
To submit a useful report of a tree health problem you will be taken through a series of pages where you will be asked a number of questions about your observation. The more information you can provide, the more useful your report will be.
What we do with your reports

What we do with your reports
We use the data obtained through TreeAlert to follow-up findings, to identify trends of spread, to direct surveys looking for regulated or quarantine pests and pathogens and to support pest and disease management.
Pests and Diseases

Pests and Diseases
If you want to know more about any specific pests and diseases then the main Forest Research website has a range of information available. Alternatively, the Observatree project has a range guides, posters and videos which can help with trying to identify a pest or disease.

Submit a Report

General Report

General Report
Submit a report of a problem affecting the health of a tree. If you suspect or know the cause then please use the Disease specific report, otherwise use this General report.
Pest or Disease Specific Reports

Pest or Disease Specific Reports
Submit a report of a specific tree pest or disease that you have seen.
Diagnosis Service

Diagnosis Service

If you own or manage trees you can request a diagnosis of a pest or disease problem. This may be a chargeable service.

More information is available on the Forest Research THDAS page.

Latest News

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Useful Links

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

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.

Pest and disease resources

Resources on diseases, insects, mammals and more.

Chalara Map

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.

Observatree

Observatree is a new UK tree health early warning system using citizen science.

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.

Ordnance Survey Explore

Ordnance Survey Explore website which is useful for looking up precise location information.