The media is full of information on Chalara dieback of Ash; Chalara fraxinea. Below are web links that give information on the fungal disease that will cause loss of foliage then dieback of the crown which may result in death of the tree should the spores infect a tree.
The mature specimen in the Garden exhibiting its winter silhouette and distinctive black buds is healthy. The wood of Ash, Fraxinus excelsior, is used to make truncheons and walking sticks.
http://www.forestry.gov.uk/chalara
Reporting suspected cases
If you think you have spotted the disease, please check the symptoms video and pictorial guide on the Foresty Commisions web site above , and their guide to recognising ash trees, before reporting it to one of the following:
In England and Wales
Chalara helpline: 08459 33 55 77 (open 8am – 6pm every day) or plant.health@forestry.gsi.gov.uk
In Scotland
Forestry Commission Scotland: 0131 314 6156 (9am – 5pm weekdays + out-of-hours messaging system) or fcscotlandenquiries@forestry.gsi.gov.uk
Fraxinus excelsior
Fraxinus excelsior