Chalara Dieback of Ash

Ash dieback 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. For more information and advice about the symptoms and spread of ash dieback through Europe and into the UK please see the Forest Research website.

What should I do if I think my ash trees have the disease?

Check the Forest Research web site for identification pictures and videos and report it to the Forestry Commission.

Within Welwyn Hatfield

Forest Research has confirmed that ash dieback is present within Welwyn Hatfield.

The Council will follow the government's latest advice. We will:

• Be vigilant for symptoms of the disease of Council maintained trees and report them to the Forest Research as necessary.
• Keep up to date with the latest outbreak information and re-appraise the situation as necessary.
• Accept the use of alternative plant species on planning applications.