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UK Risk Register Details for Lambdina fiscellaria

This record was last updated on 03/05/2023

Common Names

  • Hemlock, looper

Scenario and Pathways

Scenario for Risk Register

  • show / hide
  • Pest is introduced

Pathway Assessed for Entry to UK

  • show / hide
  • Cut flowers or branches
  • Non-squared wood

Common Pathways

  • show / hide
  • Plants for planting (except seeds bulbs and tubers)
  • Cut flowers or branches
  • Non-squared wood
  • Bark
  • Firewood
  • Roundwood of oak with bark present

Risk Ratings and Current Mitigations

Unmitigated Risks

Likelihood [1 - 5] 4
Spread [1 - 5] 2
Impact [1 - 5] 4
Value at Risk [1 - 5] 5
Likelihood x Impact [1 - 25] 16
UK Relative Risk Rating [1 - 125] 80

Current Mitigations

  • show / hide

Key mitigation for pest

Provisional quarantine pest (Great Britain).



Industry Scheme

Contingency Plan



Mitigated Risks

Likelihood [1 - 5] 2
Spread [1 - 5] 2
Impact [1 - 5] 4
Value at Risk [1 - 5] 5
Likelihood x Impact [1 - 25] 8
UK Relative Risk Rating [1 - 125] 40

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 (Lepidoptera)

Host or Industry at Risk

  • show / hide

Forestry species

Major Hosts

  • Abies amabilis (Dougl. Ex Lood) Dougl. Ex Forbes
  • Abies balsamea (L.) Mill.
  • Abies grandis (D.Don) Lindl.
  • Abies lasiocarpa var. lasiocarpa (Hook.) Nutt.
  • Acer macrophyllum Pursh
  • Acer rubrum L.
  • Acer saccharum Marsh.
  • Acer spicatum Lam.
  • Betula papyrifera Marsh.
  • Fraxinus latifolia Benth.
  • Larix occidentalis Nutt.
  • Picea engelmannii Parry Ex Engelm.
  • Picea glauca (Moench) Voss
  • Picea mariana (Mill.) Britt., Sterns & Poggenb.
  • Picea sitchensis (Bong.) Carr.
  • Pseudotsuga menziesii var. glauca (Mirb.) Franco (Beissn.) Franco
  • Quercus garryana Dougl.
  • Thuja plicata Donn Ex D.Don
  • Tsuga canadensis (L.) Carr.
  • Tsuga heterophylla (Rafin.) Sarg.

Threats to Protected Cultivation

  • N/A

Forest Tree Pests and Pathogens

  • Broadleaved & Coniferous

Further Information

PRA Availability

PRA not available

Regulation and EPPO listing

  • show / hide

Provisional quarantine pest (Great Britain). EPPO Alert

Actions Indicated

  • show / hide


Statutory action against findings

General Comments

Polyphagous moth pest of trees with damaging impacts in parts of North America where it is established. Import requirements help mitigate the risk of introduction, but a Europe wide assessment would help determine whether additional requirements would be beneficial.

Further Information


  • show / hide

Key uncertainty for pest

Full UK host range


Current distribution






UK distribution

Risk Records for this Pest