UK Risk Register Details for Cryphonectria parasitica

This record was last updated on 03/08/2020

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
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] 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 pest free area pest. Regulated non quarantine pest



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 Status Notes
Albania Present
Austria Present
Bosnia-Herzegovina Present
Belgium Present
Bulgaria Present
Switzerland Present
Czech Republic Present
Germany Present
Spain Present
France Present
United Kingdom Absent Under official control
Greece Present
Croatia Present
Hungary Present
Italy Present
Macedonia Present
Netherlands Present
Poland Present
Portugal Present
Romania Present
Serbia Present
Russia Present
Slovenia Present
Slovakia Present
Turkey Present
Ukraine Present
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 pest free area pest (whole UK and other parts of Europe). Regulated non quarantine pest. 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. Regulated pest free area status will help to mitigate the risk of introduction to the UK.

Risk Records for this Pest