• Pest is introduced

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

• Plants for planting (except seeds bulbs and tubers)
• Non-squared wood
• Wood packaging material
• Hitchhiking
• Firewood

× Likelihood For "Pest is Introduced" the lowest value of Entry or Establishment, as both are required for a successful introduction. For "Pest Spreads to Maximum Extent" this is an expert judgement on the likelihood of this occurrence. See Guidance Document for more Information Close Likelihood [1 - 5]			3
× Spread The rate at which a pest can expand, by natural dispersal only, within an area. See Guidance Document for more Information Close Spread [1 - 5]			3
× Impact The highest value from economic, environmental or social impacts. See Guidance Document for more Information Close Impact [1 - 5]		2
× Value at Risk The value of the hosts or industries at risk from this pest in the UK. See Guidance Document for more Information Close Value at Risk [1 - 5]					5
× Likelihood x Impact The likelihood multiplied by the impact, which shows the risk to the sector. See Guidance Document for more Information Close Likelihood x Impact [1 - 25]	6
× UK Relative Risk Rating Likelihood x Impact x Value at Risk. See Guidance Document for more Information Close UK Relative Risk Rating [1 - 125]	30

Key mitigation for pest

Provisional quarantine pest (Great Britain) and regulated quarantine pest (Northern Ireland), both as Euwallacea fornicatus sensu lato. Also regulated quarantine pest (as "non-European Scolytidae spp.")

Regulation

Surveillance

Industry Scheme

Contingency Plan

Awareness

Research

× Likelihood For "Pest is Introduced" the lowest value of Entry or Establishment, as both are required for a successful introduction. For "Pest Spreads to Maximum Extent" this is an expert judgement on the likelihood of this occurrence. See Guidance Document for more Information Close Likelihood [1 - 5]			3
× Spread The rate at which a pest can expand, by natural dispersal only, within an area. See Guidance Document for more Information Close Spread [1 - 5]			3
× Impact The highest value from economic, environmental or social impacts. See Guidance Document for more Information Close Impact [1 - 5]		2
× Value at Risk The value of the hosts or industries at risk from this pest in the UK. See Guidance Document for more Information Close Value at Risk [1 - 5]					5
× Likelihood x Impact The likelihood multiplied by the impact, which shows the risk to the sector. See Guidance Document for more Information Close Likelihood x Impact [1 - 25]	6
× UK Relative Risk Rating Likelihood x Impact x Value at Risk. See Guidance Document for more Information Close UK Relative Risk Rating [1 - 125]	30

Regulation

Deregulation

Management By Industry

Targeted Survey

PRA

Contingency Plan

Publicity

Research

Country / Territory			Status			Notes
Europe
	United Kingdom		Absent
North America
	United States		Present (Limited)			California
	Mexico		Present (Limited)			Outbreak under eradication
Asia
	Indonesia		Present
	Japan		Present
	Taiwan		Present

• Insect (Coleoptera)

Broadleaved trees, especially in heated glasshouses

• Acer macrophyllum Pursh
• Alnus Mill.
• Ambrosia L.
• Baccharis L.
• Baccharis salicifolia Ruiz & Pav.
• Cassia L.
• Casuarina cunninghamiana Miq.
• Erythrina humeana Spreng.
• Eucalyptus L'Herit.
• Ficus L.
• Fraxinus L.
• Juglans
• Liquidambar L.
• Magnolia L.
• Nicotiana Linnaeus
• Persea Mill.
• Persea americana Mill.
• Platanus L.
• Platanus racemosa Nutt.
• Populus L.
• Pterocarya Kunth
• Quercus L.
• Quercus agrifolia Nee
• Quercus suber L.
• Ricinus L.
• Salix L.
• Salix lasiolepis Benth.
• Sambucus L.
• Schinus L.
• Tamarix L.

• Only protected crops

• Broadleaved

PRA Availability

UK (2024)

Provisional quarantine pest (Great Britain), quarantine pest (Northern Ireland) (both as Euwallacea fornicatus sensu lato). Quarantine pest (as non-European Scolytidae spp.).

Action

Statutory action against findings

General Comments

An ambrosia beetle, native to Asia, now invasive in parts of North America. The beetle requires symbiotic fungi to survive, mainly Fusarium kuroshium. It appears likely that many broadleaved trees grown in the UK are suitable hosts. Climate is likely to limit outdoor establishment in the UK, but heated botanical glasshouses are more at risk.

Key uncertainty for pest

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

Climate

Current distribution

Hosts

Impact

Pathways

Regulation

Taxonomy

UK distribution