• Pest is introduced

• Plants for planting (except seeds bulbs and tubers)

• Plants for planting (except seeds bulbs and tubers)
• Cut flowers or branches

× 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]		2
× 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]		2
× Impact The highest value from economic, environmental or social impacts. See Guidance Document for more Information Close Impact [1 - 5]				4
× 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]	8
× UK Relative Risk Rating Likelihood x Impact x Value at Risk. See Guidance Document for more Information Close UK Relative Risk Rating [1 - 125]	40

Key mitigation for pest

Some hosts (but not all) are included in pathway prohibitions

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]		2
× 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]		2
× Impact The highest value from economic, environmental or social impacts. See Guidance Document for more Information Close Impact [1 - 5]				4
× 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]	8
× UK Relative Risk Rating Likelihood x Impact x Value at Risk. See Guidance Document for more Information Close UK Relative Risk Rating [1 - 125]	40

Regulation

Deregulation

Management By Industry

Targeted Survey

PRA

Contingency Plan

Publicity

Research

Country / Territory			Status			Notes
North America
	United States		Present (Widespread)
	Canada		Present (Widespread)

• Insect (Lepidoptera)

Broadleaved trees

• Acer L.
• Caragana Lam.
• Castanea dentata (Marsh.) Borkh.
• Celtis occidentalis L.
• Cornus L.
• Cydonia oblonga Mill.
• Fagus grandifolia Ehrh.
• Fraxinus L.
• Ilex L.
• Juglans cinerea L.
• Juglans nigra L.
• Magnolia L.
• Malus Mill.
• Populus L.
• Prunus L.
• Pyrus communis L.
• Quercus L.
• Rhododendron L.
• Rosa L.
• Salix alba L.
• Tilia L.
• Ulmus L.
• Vaccinium pallidum Ait.

• Broadleaved

PRA Availability

PRA not available

Not currently listed

Action

Statutory action against findings

General Comments

North American moth that periodically outbreaks and causes large amounts of defoliation to broadleaved trees and shrubs. Repeated infestations can cause tree death.

Key uncertainty for pest

Severity of potential outbreaks in UK

Climate

Current distribution

Hosts

Impact

Pathways

Regulation

Taxonomy

UK distribution