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UK Risk Register Details for Bretziella fagacearum

This record was last updated on 10/07/2023

Common Names

  • Oak wilt
  • Wilt of oak

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)
  • Non-squared wood
  • Squared wood

Common Pathways

  • show / hide
  • Plants for planting (except seeds bulbs and tubers)
  • Cut flowers or branches
  • Non-squared wood
  • Squared wood

Risk Ratings and Current Mitigations

Unmitigated Risks

Likelihood [1 - 5] 4
Spread [1 - 5] 2
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

  • show / hide

Key mitigation for pest

Regulated quarantine pest



Industry Scheme

Contingency Plan



Mitigated Risks

Likelihood [1 - 5] 2
Spread [1 - 5] 2
Impact [1 - 5] 5
Value at Risk [1 - 5] 5
Likelihood x Impact [1 - 25] 10
UK Relative Risk Rating [1 - 125] 50

Proposed Actions

Proposed Actions



Management By Industry

Targeted Survey


Contingency Plan



Distribution and Pest Details


Country / Territory Status Notes
United Kingdom Absent
North America Present
United States Present
Canada Present Present but not widely distributed and under official control.

Type of Pest

  • Fungus

Host or Industry at Risk

  • show / hide


Major Hosts

  • Quercus L.
  • Quercus alba L.
  • Quercus coccinea Muenchh.
  • Quercus ellipsoidalis E.J.Hill
  • Quercus falcata Michx.
  • Quercus macrocarpa Michx.
  • Quercus palustris Muenchh./Du Roi
  • Quercus petraea (Matt.) Liebl.
  • Quercus prinus L.
  • Quercus pubescens Willd.
  • Quercus robur L.
  • Quercus rubra L.
  • Quercus shumardii Buckl.
  • Quercus stellata Wangenh.
  • Quercus velutina Lam.
  • Quercus virginiana Mill.

Threats to Protected Cultivation

Forest Tree Pests and Pathogens

  • Broadleaved

Further Information

PRA Availability

UK (2015)

Regulation and EPPO listing

  • show / hide

Regulated quarantine pest. EPPO A1

Actions Indicated

  • show / hide


Statutory action against findings. Plant sentinel research to see effect on UK native oaks.

General Comments

Fungus causing impacts on oak in North America. Regulation from this region gives protection and research will assess the threat to UK species of oak.

Risk Records for this Pest