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UK Risk Register Details for Dryocosmus kuriphilus

This record was last updated on 24/01/2023

Common Names

  • oriental chestnut gall wasp

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)
  • Cut flowers or branches

Risk Ratings and Current Mitigations

Unmitigated Risks

Likelihood [1 - 5] 3
Spread [1 - 5] 3
Impact [1 - 5] 3
Value at Risk [1 - 5] 3
Likelihood x Impact [1 - 25] 9
UK Relative Risk Rating [1 - 125] 27

Current Mitigations

  • show / hide

Key mitigation for pest

Regulated protected zone quarantine pest (Northern Ireland)



Industry Scheme

Contingency Plan



Mitigated Risks

Likelihood [1 - 5] 3
Spread [1 - 5] 3
Impact [1 - 5] 3
Value at Risk [1 - 5] 3
Likelihood x Impact [1 - 25] 9
UK Relative Risk Rating [1 - 125] 27

Proposed Actions

Proposed Actions



Management By Industry

Targeted Survey


Contingency Plan



Distribution and Pest Details


Country / Territory Status Notes
Romania Present
Slovakia Present
Slovenia Present
Spain Present
Switzerland Present
Türkiye Present
United Kingdom Present (Limited)
Albania Present
Austria Present
Belgium Present
Bosnia-Herzegovina Present
Croatia Present
Czech Republic Present
France Present
Germany Present
Greece Present
Hungary Present
Italy Present
Netherlands Present
Portugal Present
North America
Canada Present
United States Present
China Present
Japan Present
Nepal Present
South Korea Present
Taiwan Present

Type of Pest

  • Insect (Hymenoptera)

Host or Industry at Risk

  • show / hide

Castanea sativa

Major Hosts

  • Castanea Mill.
  • Castanea crenata Sieb. & Zucc.
  • Castanea dentata (Marsh.) Borkh.
  • Castanea mollissima Blume
  • Castanea sativa Mill.

Threats to Protected Cultivation

Forest Tree Pests and Pathogens

  • Broadleaved

Further Information

PRA Availability

EPPO (2003)

Regulation and EPPO listing

  • show / hide

Regulated protected zone quarantine pest (Northern Ireland). EPPO A2

Actions Indicated

  • show / hide


No statutory action in Great Britain. Statutory action in Northern Ireland. Research into management options, e.g. biocontrol.

General Comments

Gall wasp pest of sweet chestnut recently established in the UK. Populations of the pest have been confirmed in areas including South-East England.

Risk Records for this Pest