UK Risk Register Details for Euwallacea fornicatus

This record was last updated on 12/05/2021

Common Names

  • Polyphagous Shot Hole Borer

Scenario and Pathways

Scenario for Risk Register

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  • Pest is introduced

Pathway Assessed for Entry to UK

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  • Plants for planting (except seeds bulbs and tubers)
  • Wood packaging material

Common Pathways

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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] 2
Spread [1 - 5] 2
Impact [1 - 5] 3
Value at Risk [1 - 5] 5
Likelihood x Impact [1 - 25] 6
UK Relative Risk Rating [1 - 125] 30

Current Mitigations

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Key mitigation for pest

Regulated quarantine pest (as "non-European Scolytidae spp.")



Industry Scheme

Contingency Plan



Mitigated Risks

Likelihood [1 - 5] 2
Spread [1 - 5] 2
Impact [1 - 5] 3
Value at Risk [1 - 5] 5
Likelihood x Impact [1 - 25] 6
UK Relative Risk Rating [1 - 125] 30

Proposed Actions

Proposed Actions



Management By Industry

Targeted Survey


Contingency Plan



Distribution and Pest Details


Country / Territory Status Notes
Netherlands Present Actionable, under eradication.
Italy Present (Limited) Outbreak in botanical glasshouse
United Kingdom Absent
Germany Present Outbreak in botanical glasshouse - under eradication
North America
United States Present (Limited) California
Samoa Present
South Africa Present
China Present
India Present
Israel Present
Japan Present
Malaysia Present
Sri Lanka Present
Taiwan Present
Thailand Present
Vietnam Present

Type of Pest

  • Insect (Coleoptera)

Host or Industry at Risk

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Broadleaved trees

Major Hosts

  • Acacia Miller
  • Acer L.
  • Ailanthus Desf.
  • Albizia (= Albizzia) Durazz.
  • Alnus Mill.
  • Bauhinia variegata L.
  • Carya Nutt.
  • Cunninghamia R.Br.
  • Erythrina L.
  • Eucalyptus L'Herit.
  • Ficus L.
  • Fraxinus L.
  • Juglans
  • Liquidambar L.
  • Magnolia L.
  • Milicia excelsa (Welw.) Berg
  • Morus L.
  • Ochroma lagopus Sw.
  • Persea americana Mill.
  • Platanus L.
  • Populus L.
  • Quercus L.
  • Ricinus L.
  • Robinia L.
  • Salix L.
  • Sambucus L.
  • Schinus L.
  • Ulmus L.
  • Umbellularia Nees

Threats to Protected Cultivation

  • N/A

Forest Tree Pests and Pathogens

  • Broadleaved

Further Information

PRA Availability

UK (2015) - NB before taxonomy of the species group was revised and clarified

Regulation and EPPO listing

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Provisional quarantine pest (Great Britain) (as Euwallacea fornicatus sensu lato). Quarantine pest (as non-European Scolytidae spp.). EPPO A2

Actions Indicated

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Statutory action against findings

General Comments

A disease complex involving an ambrosia beetle and fungus (Neocosmospora euwallaceae), native to Asia but now present in a number of other countries. Hosts potentially at risk in the UK include English oak and other broad leaved tree species. Climate is likely to be a limiting factor regarding establishment. Watching brief needed for any pest spread into areas with cooler climates. Regulation is being considered to help mitigate the risks to the UK.

Further Information


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Key uncertainty for pest

Repeated taxonomic revisions for the species group mean that older data often cannot be unambiguously assigned to a species.


Current distribution






UK distribution

Risk Records for this Pest