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UK Risk Register Details for Cryphonectria parasitica

This record was last updated on 12/01/2021

Common Names

  • Blight of chestnut
  • Blight of oak
  • Canker of chestnut
  • Chestnut blight
  • Chestnut canker

Scenario and Pathways

Scenario for Risk Register

  • show / hide
  • Pest is introduced

Pathway Assessed for Entry to UK

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

Common Pathways

  • show / hide
  • Plants for planting (except seeds bulbs and tubers)
  • Non-squared wood
  • Bark

Risk Ratings and Current Mitigations

Unmitigated Risks

Likelihood [1 - 5] 4
Spread [1 - 5] 3
Impact [1 - 5] 5
Value at Risk [1 - 5] 3
Likelihood x Impact [1 - 25] 20
UK Relative Risk Rating [1 - 125] 60

Current Mitigations

  • show / hide

Key mitigation for pest

Regulated quarantine pest (Great Britain. Northern Ireland may differ),



Industry Scheme

Contingency Plan



Mitigated Risks

Likelihood [1 - 5] 2
Spread [1 - 5] 3
Impact [1 - 5] 5
Value at Risk [1 - 5] 3
Likelihood x Impact [1 - 25] 10
UK Relative Risk Rating [1 - 125] 30

Proposed Actions

Proposed Actions



Management By Industry

Targeted Survey


Contingency Plan



Distribution and Pest Details


Country / Territory Status Notes
Albania Present
Austria Present
Belgium Present
Bosnia-Herzegovina Present
Bulgaria Present
Croatia Present
Czech Republic Present
France Present
Germany Present
Greece Present
Hungary Present
Italy Present
Republic of North Macedonia Present
Portugal Present
Romania Present
Russia Present
Serbia Present
Slovenia Present
Spain Present
Switzerland Present
Turkey Present
Ukraine Present
Netherlands Present
Poland Present
Slovakia Present
United Kingdom Absent Under official control
North America
Canada Present
United States Present
Australia Present
Tunisia Present
Azerbaijan Present
China Present
Georgia Present
India Present
Iran Present
Japan Present
North Korea Present
South Korea Present
Taiwan Present

Type of Pest

  • Fungus

Host or Industry at Risk

  • show / hide

Castanea sativa

Major Hosts

  • Castanea Mill.
  • Castanea dentata (Marsh.) Borkh.
  • Castanea sativa Mill.
  • Quercus L.

Threats to Protected Cultivation

Forest Tree Pests and Pathogens

  • Broadleaved

Further Information

PRA Availability

UK (2013)

Regulation and EPPO listing

  • show / hide

Regulated quarantine pest (Great Britain. Northern Ireland may differ), EPPO A2

Actions Indicated

  • show / hide


Surveillance and statutory action against findings. Improved preparedness, including awareness raising and research.

General Comments

The disease is very damaging in North America and spreading in Europe where it has been damaging but not the same extent as in the US. Regulations help to mitigate the risk to the UK.

Risk Records for this Pest