Tree health survey
The best time to do this survey is between May and September.
Help scientists monitor and protect our trees, forests and woodland
Ecologist Mike Dilger introduces our guide to taking part in the tree health survey
Trees are vital – bringing nature into urban areas, supporting the rural economy, providing food and habitats for wildlife, and helping to combat climate change.
However, our trees are under threat. The number of pests and diseases attacking them has increased in the last few years.
How to take part
Step 2 – Find a site with safe access to one or more broadleaved trees and start surveying!
Did you know?
Knopper galls, which can form on acorns, are caused by a tiny gall wasp called Andricus quercuscalicis. This pest first arrived in southern England in the 1950s and has now invaded most of the UK.
Step 3 – Tell us what you find using our simple online form.
Ready to enter your results online?
Just want to submit a possible pest or disease sighting?
Use the form below to tell us about a pest or disease you've spotted outside the survey. Please include a photo if you can.
A good biosecurity routine can reduce the risk of spreading diseases and invasive species.
Problems entering your results online?
Send your results to: FREEPOST RSCH-CHYJ-HYYC, OPAL, Centre for Environmental Policy, Imperial College, South Kensington, London SW7 2AZ.
Survey instructions and information about Oak, Ash and Horse Chestnut trees
Recording sheets and information on 12 important pests and diseases to look out for
Guide: Six pests and diseases that could pose a serious threat to our trees
Find out how the tree health survey fits into the National Curriculum in England (PDF, 53 KB)
You may download these documents for use in the context of the OPAL project only. All other rights are reserved.
Policy and regulation
To find out about the action being taken by UK governments and their agencies to protect our trees from pests and diseases, visit:
- Gov.uk – sustaining and enhancing trees, forests and woodland
- Welsh Government – forestry
- Scottish Government – Forestry
- Northern Ireland Environment Agency – Forestry