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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.
Abiotic Reports

Abiotic Reports

Submit a report of damage not caused by a pest or disease, including
  • Stem Cracking
  • Oak Shake
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

Report instances of oak shake this felling season

Report instances of oak shake this felling season

8th Sep 2025

Scientists are calling on woodland owners to report instances of oak shake this felling season as part of research to identify the causes of the cracking.

Help prevent establishment of spruce bark beetle by joining national monitoring project

Help prevent establishment of spruce bark beetle by joining national monitoring project

28th Aug 2025

Help protect Britain’s spruce forests by installing pheromone traps and contributing vital data on the spruce bark beetle, Ips typographus.

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