Most Unwanted: pests and diseases

These are six pests and diseases that could have a very serious impact on our trees.

You are unlikely to find most of them during your OPAL survey, as they are not widespread or not yet present in the UK. But if you do find them, it is important that you take the right action immediately.

If you think you have spotted one of the Most Unwanted, it is essential that you alert Forestry Commission officials through:

  • TreeAlert app: www.forestry.gov.uk/treealert
  • Telephone: 08459 335577 (England and Wales), 0131 314 6156 (Scotland) or 0300 200 7847 (Northern Ireland)

For more information, visit the Forest Research website.

Identifying the Most Unwanted

Asian Longhorn Beetle
Asian Longhorn Beetle

Citrus Longhorn Beetle
Citrus Longhorn Beetle

Leaves showing Chalara
Chalara Ash Dieback

Emerald Ash Borer
Emerald Ash Borer

Oak Processionary Moth
Oak Processionary Moth

Pine Processionary Moth
Pine Processionary Moth

Images all © Forestry Commission except Ash dieback © Andrej Kunca, Pine Processionary Moth © John Ghent.

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