Tree pests and diseases
What is the difference between Ash decline and Ash dieback? How do you spot the signs of Horse Chestnut Leaf-miner?
Learn how to identify some of the pests and diseases that can affect Oak, Ash and Horse Chestnut trees, as well as our six Most Unwanted.
A good biosecurity routine can reduce the risk of spreading diseases and invasive species.
Report a pest or disease sighting
Have you spotted one of our 18 pests and diseases? Your information could be vital in helping scientists protect our trees. Enter the details of your sighting and include pictures if you can.
Concerned about a tree?
Are you worried about the health of a tree you've surveyed? Do you want to know how your data could be helping scientists?