Ash dieback

Find out about ash dieback, how we manage its impact and information for tree owners.

Ash dieback disease is caused by the fungus Hymenoscyphus fraxineus, formerly known as Chalara fraxinea. In West Sussex, nearly 21% of all broadleaved trees are ash, covering 4,968 hectares.

The disease has the potential to kill 95% of West Sussex ash trees over the next 10–20 years. This would have a major impact on the county’s landscape, the wildlife it supports and other ecosystem services that trees provide such as:

  • filtering the air
  • storing carbon
  • reducing flooding
  • providing shade
  • protecting soils.

For more information, including how to recognise and report the disease, visit Forest Research.

How we manage its impact

A targeted drive-by survey of the county’s roads will be carried out in summer 2019 in order to record where ash trees are. This information will help prioritise more detailed condition surveys and any action required, such as felling.

Our plan to manage ash dieback will be closely aligned with the Ash Dieback Action Plan Toolkit. Working proactively with districts, boroughs, other neighbouring authorities and stakeholders will effectively tackle the impacts of ash dieback and promote long-term recovery and resilience in our treescape.

Information for tree owners

Tree owners have a legal duty of care and must maintain their trees in a reasonably safe condition. We are only responsible for trees growing on council property, including adopted highway verges.

In almost all cases, trees that are next to roads and public rights of way are the responsibility of the neighbouring landowner. Where a tree on private land poses a danger to the highway users, we may contact the landowner and explain what work needs to be done and when it should be completed by. The tree owner is responsible for the cost of this work.

For most landowners, the first step will be to contact a tree surgeon. They will be able to provide quotes for the work required and advice on what traffic management will be needed while the work is carried out. The Arboricultural Association has an approved contractor and consultant directory.

Check the standing advice for protected species before any work starts.

Information for woodland owners

If you own woodland that contains ash you should be aware that:

  • markets for lower grade timber are available which may help reduce the cost of felling
  • there are grants available under Countryside Stewardship that can contribute towards the cost of restocking and ongoing management. Parish councils are eligible to apply for Countryside Stewardship.

For further information on managing your woodland, contact your local Forestry Commission Woodland Officer below:

Please be aware that under the Forestry Act 1967 as amended, a licence is required to fell most trees. Details of how to apply for a licence, and any exemptions which may apply, are outlined in the Tree felling - getting permission document, available on GOV.UK. 

Tree works and traffic management

If you need to manage traffic while work is being carried out on a tree, you will need to apply for a Temporary Traffic Regulation Order.

Tree Preservation Orders (TPOs) and trees in conservation areas

To check whether the tree requiring work is subject to a TPO, or in a conservation area, contact the tree officer at your relevant district or borough council before starting any work.

Further information

Last updated:
30 May 2019

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