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Ash dieback disease

Ash dieback is a fungal disease that kills ash trees. It is spreading throughout the UK and has been found in South Gloucestershire.

You can help us deal with the impact of ash dieback in South Gloucestershire by:

  • Reporting cases of ash dieback that you see
  • Disposing of fallen leaves carefully to stop the spread of the disease
  • Dealing effectively with diseased trees on your land. Advice on choosing a tree surgeon is provided below.

Reporting cases of Ash dieback

Ash dieback has been found in South Gloucestershire and we want to monitor the disease to help prevent it spreading.

You can help by telling us and Government agencies when you see cases of Ash dieback.

An affected tree will typically have the following symptoms:

  • Leaf death, often beginning at the tip and extending into the leaf vein
  • Brown or black discolouration of the leaf stem
  • Brown spots developing close to leaf scars or side shoots
  • Dead leaves being held on the tree. This is not to be confused with the hanging seeds, which are normal.
  • Dieback of the tree crown, so that the ends of branches are visibly dead

Please note that ash trees are among the latest to leaf in the spring, so what appears to be a dead tree may not yet have come into leaf.

The Government has also asked for suspected cases to be reported to the following specialist bodies.

Forest Research Disease Diagnostic Advisory Service
Tel. 01420 23000; Email

Forestry Commission Plant Health Service
Tel. 0131 3146414; Email

Fera Plant Health and Seeds Inspectorate
Tel. 01904 465625; Email

DisposingĀ of fallen leaves carefully

Ash dieback is spread through the movement of infected plants and through airborne fungal spores. The spores are produced from the fungus on infected dead leaves during the months of June to September.

You can help slow the movement of spores by following these guidelines:

  • Do not put ash leaves in your green waste bin
  • Do not move ash leaves to another site eg. a recycling centre
  • Research has shown that the fungus can live up to a year in compost and so where possible fallen ash leaves should be burnt on site. A garden incinerator is preferable to an open bonfire as it contains the leaves and burns more effectively
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