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UK Risk Register Details for Heterobasidion irregulare

This record was last updated on 08/01/2021

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

Common Pathways

  • show / hide
  • Plants for planting (except seeds bulbs and tubers)
  • Non-squared wood
  • Squared wood
  • Wood packaging material

Risk Ratings and Current Mitigations

Unmitigated Risks

Likelihood [1 - 5] 3
Spread [1 - 5] 3
Impact [1 - 5] 5
Value at Risk [1 - 5] 5
Likelihood x Impact [1 - 25] 15
UK Relative Risk Rating [1 - 125] 75

Current Mitigations

  • show / hide

Key mitigation for pest

Provisional quarantine pest (Great Britain)



Industry Scheme

Contingency Plan



Mitigated Risks

Likelihood [1 - 5] 3
Spread [1 - 5] 3
Impact [1 - 5] 4
Value at Risk [1 - 5] 5
Likelihood x Impact [1 - 25] 12
UK Relative Risk Rating [1 - 125] 60

Proposed Actions

Proposed Actions



Management By Industry

Targeted Survey


Contingency Plan



Distribution and Pest Details


Country / Territory Status Notes
Italy Present (Limited)
United Kingdom Absent
North America
United States Present
Canada Present
Mexico Present
Central America
Cuba Present
Dominican Republic Present

Type of Pest

  • Fungus

Host or Industry at Risk

  • show / hide


Major Hosts

  • Abies Miller
  • Abies balsamea (L.) Mill.
  • Calocedrus decurrens (Torr.) Florin
  • Juniperus L.
  • Juniperus occidentalis Hook.
  • Juniperus virginiana L.
  • Larix Mill.
  • Larix laricina (Du Roi) K.Koch
  • Larix lyalii Parl.
  • Larix occidentalis Nutt.
  • Picea A.Dietr.
  • Picea abies (L.) H. Karst.
  • Picea glauca (Moench) Voss
  • Picea sitchensis (Bong.) Carr.
  • Pinus L.
  • Pinus banksiana Lamb.
  • Pinus coulteri D.Don
  • Pinus edulis Engelm.
  • Pinus elliottii Engelm.
  • Pinus halepensis Mill.
  • Pinus jeffreyi Grev. & Balf./Murr.
  • Pinus lambertiana Dougl.
  • Pinus monophylla Torr. & Frem.
  • Pinus palustris Mill.
  • Pinus pinea L.
  • Pinus ponderosa Dougl. Ex P. & C.Laws.
  • Pinus radiata D.Don
  • Pinus resinosa Ait./Soland.
  • Pinus strobus L.
  • Pinus taeda L.
  • Pseudotsuga Carr.
  • Pseudotsuga menziesii var. menziesii (Mirbel) Franco
  • Thuja plicata Donn Ex D.Don

Threats to Protected Cultivation

Forest Tree Pests and Pathogens

  • Coniferous

Further Information

PRA Availability

EPPO (2015)

Regulation and EPPO listing

  • show / hide

Provisional quarantine pest (Great Britain). EPPO Alert

Actions Indicated

  • show / hide


Statutory action against findings. Consider case for regulation based on EPPO PRA.

General Comments

Fungal pest of pine present in North America and Italy. Could potentially be damaging if introduced to the UK and regulation should be considered.

Risk Records for this Pest