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UK Risk Register Details for Hymenoscyphus fraxineus

This record was last updated on 06/07/2022

Common Names

  • Ash dieback

Scenario and Pathways

Scenario for Risk Register

  • show / hide
  • Pest spreads to maximum extent

Pathway Assessed for Entry to UK

  • show / hide

Common Pathways

  • show / hide
  • Plants for planting (except seeds bulbs and tubers)

Risk Ratings and Current Mitigations

Unmitigated Risks

Likelihood [1 - 5] 4
Spread [1 - 5] 4
Impact [1 - 5] 5
Value at Risk [1 - 5] 5
Likelihood x Impact [1 - 25] 20
UK Relative Risk Rating [1 - 125] 100

Current Mitigations

  • show / hide

Key mitigation for pest



Industry Scheme

Contingency Plan



Mitigated Risks

Likelihood [1 - 5] 4
Spread [1 - 5] 4
Impact [1 - 5] 4
Value at Risk [1 - 5] 5
Likelihood x Impact [1 - 25] 16
UK Relative Risk Rating [1 - 125] 80

Proposed Actions

Proposed Actions



Management By Industry

Targeted Survey


Contingency Plan



Distribution and Pest Details


Country / Territory Status Notes
Europe Present
Luxembourg Present
Norway Present
Russia Present
Switzerland Present
Ukraine Present
Belarus Present
United Kingdom Present (Widespread)
Austria Present
Belgium Present
Croatia Present
Czech Republic Present
Denmark Present
Estonia Present
Finland Present
France Present
Germany Present
Guernsey Present
Hungary Present
Ireland Present
Italy Present
Latvia Present
Lithuania Present
Netherlands Present
Poland Present
Romania Present
Slovakia Present
Slovenia Present
Sweden Present
Japan Present
China Present
South Korea Present

Type of Pest

  • Fungus

Host or Industry at Risk

  • show / hide


Major Hosts

  • Chionanthus virginicus L.
  • Fraxinus americana L.
  • Fraxinus angustifolia ssp. angustifolia Vahl
  • Fraxinus excelsior L.
  • Fraxinus mandshurica Rupr.
  • Fraxinus nigra Marsh.
  • Fraxinus rhynchophylla Hance
  • Phillyrea L.
  • Fraxinus pennsylvanica

Threats to Protected Cultivation

Forest Tree Pests and Pathogens

  • Broadleaved

Further Information

PRA Availability

UK (2013)

Regulation and EPPO listing

  • show / hide


Actions Indicated

  • show / hide


Statutory restrictions on import of ash from outside Europe. Actions by local authorities in line with current management plans/strategies.

General Comments

Fungal pest of ash established across much of the UK. Import restrictions for ash originating from outside Europe are in place, as well as management strategies in each part of the UK.

Risk Records for this Pest