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UK Risk Register Details for Chrysobothris mali

This record was last updated on 21/06/2024

Common Names

  • Apple tree, borer, Pacific flatheaded
  • Pacific flatheaded borer,
  • Plum and prune-Pacific flatheaded borer

Scenario and Pathways

Scenario for Risk Register

  • show / hide
  • Pest is introduced

Pathway Assessed for Entry to UK

  • show / hide
  • Non-squared wood
  • Firewood

Common Pathways

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

Risk Ratings and Current Mitigations

Unmitigated Risks

Likelihood [1 - 5] 3
Spread [1 - 5] 3
Impact [1 - 5] 3
Value at Risk [1 - 5] 5
Likelihood x Impact [1 - 25] 9
UK Relative Risk Rating [1 - 125] 45

Current Mitigations

  • show / hide

Key mitigation for pest

Regulated quarantine pest (Great Britain) with specific measures on pathways. Measures on the import of wood of some hosts



Industry Scheme

Contingency Plan



Mitigated Risks

Likelihood [1 - 5] 2
Spread [1 - 5] 3
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
United Kingdom Absent
North America
Canada Present
United States Present

Type of Pest

  • Insect (Coleoptera)

Host or Industry at Risk

  • show / hide

Broadleaved trees

Major Hosts

  • Acer macrophyllum Pursh
  • Acer pseudoplatanus L.
  • Acer rubrum L.
  • Acer saccharinum L.
  • Aesculus hippocastanum L.
  • Arbutus menziesii Pursh
  • Ceanothus sorediatus Hook. & Arn.
  • Cercocarpus montanus (H.B.K.) Raf.
  • Corylus avellana Linnaeus
  • Corylus cornuta var. californica Marsh.
  • Eriobotrya japonica (Thunb.) Lindl.
  • Eucalyptus globulus Labill.
  • Ficus carica L.
  • Heteromeles arbutifolia (Aiton) M.Roemer
  • Juglans regia L.
  • Liriodendron tulipifera L.
  • Malus domestica Borkhausen
  • Malus sylvestris subsp. sylvestris (Linnaeus) Miller
  • Platanus orientalis L.
  • Platanus racemosa Nutt.
  • Populus tremuloides Michx.
  • Prunus armeniaca L.
  • Prunus avium ssp./var. avium L.
  • Prunus cerasus L.
  • Prunus domestica ssp. domestica L.
  • Prunus ilicifolia (Nutt.) Walp.
  • Prunus persica Batsch
  • Prunus serrulata Lindl.
  • Prunus subcordata Benth.
  • Pyrus communis L.
  • Quercus agrifolia Nee
  • Frangula californica (Eschscholtz) A. Gray
  • Ribes rubrum L.
  • Rosa L.
  • Salix lasiolepis Benth.
  • Sorbus aucuparia var. edulis L.
  • Ulmus americana L.
  • Ulmus glabra Huds. em. Moss
  • Ulmus x hollandica Miller
  • Vaccinium L.
  • Vaccinium corymbosum L.
  • Fagus sylvatica L.
  • Acer negundo
  • Pickeringia montana Torrey & A. Gray
  • Prunus pendula Maximowicz

Threats to Protected Cultivation

  • N/A

Forest Tree Pests and Pathogens

  • Broadleaved

Further Information

PRA Availability

EPPO (2021)

Regulation and EPPO listing

  • show / hide

Regulated quarantine pest (Great Britain). EPPO A1

Actions Indicated

  • show / hide


Statutory action against interceptions and outbreaks in Great Britain

General Comments

North American beetle pest of fruit trees and many other woody hosts. Most damage has been reported on younger, recently planted, trees especially in orchard settings. There is some uncertainty over whether the cooler, wetter summers in the UK will be suitable for high levels of damage.

Further Information


  • show / hide

Key uncertainty for pest

Whether specific climatic factors such as dry summers increase impacts


Current distribution






UK distribution

Risk Records for this Pest