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UK Risk Register Details for Lepidosaphes ussuriensis

This record was last updated on 03/05/2023

Common Names

  • Ussuri oystershell scale
  • Ussurian comma scale

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)

Common Pathways

  • show / hide
  • Plants for planting (except seeds bulbs and tubers)
  • Cut flowers or branches
  • Hitchhiking

Risk Ratings and Current Mitigations

Unmitigated Risks

Likelihood [1 - 5] 3
Spread [1 - 5] 1
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

Provisional quarantine pest (Great Britain). Prohibition of some key hosts



Industry Scheme

Contingency Plan



Mitigated Risks

Likelihood [1 - 5] 2
Spread [1 - 5] 1
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
Japan Present
China Present
South Korea Present
Russia Present Far East

Type of Pest

  • Insect (Hemiptera)

Host or Industry at Risk

  • show / hide

Broadleaved trees

Major Hosts

  • Alnus Mill.
  • Alnus hirsuta (Spach) Rupr.
  • Betula L.
  • Betula pendula Roth
  • Euonymus L.
  • Euonymus hamiltoniana var. maackii Wall.
  • Ficus L.
  • Malus Mill.
  • Malus baccata (Linnaeus) Borkhausen
  • Malus mandshurica (Maxim.) Kom. ex Juz
  • Morus L.
  • Physocarpus amurensis (Maxim.) Maxim.
  • Populus L.
  • Populus maximowiczii Henry
  • Populus suaveolens Fisch.
  • Populus tremula L.
  • Prunus L.
  • Pyrus L.
  • Salix L.
  • Syringa reticulata var. mandschurica (Blume) Hara (Maxim.) Hara
  • Ulmus L.
  • Ulmus japonica (Rehd.) Sarg.
  • Ulmus laciniata (Trautv.) Mayr
  • Ulmus pumila L.
  • Vitis vinifera L.

Threats to Protected Cultivation

Forest Tree Pests and Pathogens

  • Broadleaved

Further Information

PRA Availability

PRA not available

Regulation and EPPO listing

  • show / hide

Provisional quarantine pest (Great Britain). EPPO A2

Actions Indicated

  • show / hide


Statutory action against findings

General Comments

Scale insect affecting a range of broadleaved trees in Asia. Regulation of some hosts and import inspections mitigate the risk of introduction.

Risk Records for this Pest