UK Risk Register Details for Cryphonectria parasitica

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

EU regulated and UK protected zone



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
Europe Present Cosmopolitan
Austria Present
Belgium Present
Germany Present
Spain Present
France Present
United Kingdom Absent Under official control
Greece Present
Croatia Present
Hungary Present
Italy Present
Netherlands Present
Poland Present
Portugal Present
Romania Present
Slovenia Present
Slovakia Present
North America Present Cosmopolitan
South America Present Cosmopolitan
Oceania Present Cosmopolitan
Africa Present Cosmopolitan
Asia Present Cosmopolitan

Type of Pest

  • Fungus

Host or Industry at Risk

  • show / hide

Castanea sativa

Major Hosts

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

Threats to Protected Cultivation

Forest Tree Pests and Pathogens

  • Broadleaved

Further Information

PRA Availability

UK (2013)

EU and EPPO Listing

EC IIAII, UK Protected Zone

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. EU Protected Zone status will help to mitigate the risk of introduction to the UK.

Risk Records for this Pest