Chalara dieback of ash is a serious disease of ash trees caused by a fungus called Chalara fraxinea (C. fraxinea). The disease causes leaf loss and crown dieback in affected trees, and it can lead to tree death.
If you think you have found Ash with Chalara dieback please report your sighting to one of the following organisations:
Forestry Commission Plant Health Service
Call: 0131 314 6414
Forest Research Tree Health Diagnostic and Advisory Service
Call: 01420 23000
Fera Plant Health and Seeds Inspectorate
Call: 01904 465625