UK Risk Register Details for Hymenoscyphus fraxineus

Common Names

  • Ash dieback

Scenario and Pathways

Scenario for Risk Register

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  • Pest spreads to maximum extent

Pathway Assessed for Entry to UK

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Common Pathways

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This section is currently being developed as part of the next phase of the Risk Register.

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

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Key mitigation for pest

UK emergency measures



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

Type of Pest

  • Fungus

Host or Industry at Risk

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Major Hosts

  • Fraxinus excelsior L.

Threats to Protected Cultivation

Forest Tree Pests and Pathogens

  • Broadleaved

Further Information

PRA Availability

UK (2013)

EU and EPPO Listing

UK Plant Health Order; EPPO A2, EPPO alert list

Actions Indicated

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Statutory restrictions on import and movement of ash. Actions in line with current management plans/strategies.

General Comments

Fungal pest of ash established in parts of the UK. Import and movement restrictions for ash are in place as well as management/control strategies in each part of the UK.

Risk Records for this Pest