Ash Dieback

Ash dieback disease

Ash dieback is a serious disease in ash trees caused by the fungus Hymenoscyphus fraxineus. It is expected to kill up to 95% of ash trees across the UK, changing the landscape forever.

The disease originated in Asia and made its way to the UK via Europe.  Although the spores of this fungus can travel in the wind, it is thought to have arrived in the UK through the importation of affected ash saplings from Europe.  A ban on importing the species was put in place in 2012. 

Young trees generally die within a year or two after the first signs of the disease but large trees often survive for several years. 

Signs of ash dieback disease:

  • Leaves develop dark patches in the summer.
  • Leaves will then wilt and discolour to black and might shed early. 
  • Dieback of the shoots and leaves is visible in the summer.
  • Diamond-shaped, dark brown lesions develop where branches meet the trunk.
  • The inner bark will look a brownish-grey under the lesions.
  • Signs of new growth from previously dormant buds can be found further down the trunk. This is known as epicormic growth and is a common response to stress in trees.

What can you do to help avoid the spread of ash dieback?

  • Clean your shoes before and after visiting a woodland area.
  • Please avoid taking cuttings or plant material from the countryside.
  • Wash your car or bike wheels to remove mud or plant matter.

Naturally Trees are fully certified in the practice of arboriculture; we understand tree pests and diseases and have more than 20 years’ experience in tree surgery and consultancy services.  Furthermore, Naturally Trees is covered by £5 million public liability insurance, and all staff has minimum NPTC (National Proficiency Training Council) qualifications as standard. 

For more further reading look at the Forrest Commission website at

If you would like advice and help, talk with the experts at Naturally Trees.

Get in touch for an obligation free quote by phoning 07555 224 201 or 01488 50 50 58 or email us at

Areas we cover

Tree Survey Hungerford              Tree Survey Newbury

Tree Survey Marlborough           Tree Survey Basingstoke

Tree Survey Swindon                   Tree Survey Reading

Tree Survey Wantage                  Tree Survey Winchester

Tree Survey Andover                   Tree Survey Oxford