UK Plant Health Risk Register

Scenario and Pathways

Scenario for Risk Register

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Pest spreads to maximum extent

Pathway Assessed for Entry to UK

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Hitchhiking

Common Pathways

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Plants for planting (except seeds bulbs and tubers)
Hitchhiking

Risk Ratings and Current Mitigations

Unmitigated Risks

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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 Likelihood [1 - 5]			3
Entry The Likelihood of movement of the pest into the UK on a pathway and transfer of that pest to a suitable host. See Guidance Document for more Information Entry [1 - 5]
Establishment The likelihood of the pest surviving and perpetuating in the UK for the foreseeable future after it has entered. See Guidance Document for more Information Establishment [1 - 5]
Spread The rate at which a pest can expand, by natural dispersal only, within an area. See Guidance Document for more Information Spread [1 - 5]		2
Impact The highest value from economic, environmental or social impacts. See Guidance Document for more Information Impact [1 - 5]			3
Impact - Economic The predicted economic impacts of the pest in the UK. This includes direct effects on yield, quality and possible indirect effects such as trade implications. See Guidance Document for more Information Impact - Economic [1 - 5]		2
Impact - Environmental The proportion of the environmental value of the plant which is likely to be lost through the introduction of the pest. See Guidance Document for more Information Impact - Environmental [1 - 5]		2
Impact - Social The predicted social impacts of a pest in the UK, including effects on tourism, amenities and animal and human health. See Guidance Document for more Information Impact - Social [1 - 5]			3
Value at Risk The value of the hosts or industries at risk from this pest in the UK. See Guidance Document for more Information Value at Risk [1 - 5]				4
Likelihood x Impact The likelihood multiplied by the impact, which shows the risk to the sector. See Guidance Document for more Information Likelihood x Impact [1 - 25]	9
UK Relative Risk Rating Likelihood x Impact x Value at Risk. See Guidance Document for more Information UK Relative Risk Rating [1 - 125]	36

Current Mitigations

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Key mitigation for pest

Surveillance including Obsesrvatree volunteers

Regulation

Surveillance

Industry Scheme

Contingency Plan

Awareness

Research

Mitigated Risks

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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 Likelihood [1 - 5]			3
Entry The Likelihood of movement of the pest into the UK on a pathway and transfer of that pest to a suitable host. See Guidance Document for more Information Entry [1 - 5]
Establishment The likelihood of the pest surviving and perpetuating in the UK for the foreseeable future after it has entered. See Guidance Document for more Information Establishment [1 - 5]
Spread The rate at which a pest can expand, by natural dispersal only, within an area. See Guidance Document for more Information Spread [1 - 5]			3
Impact The highest value from economic, environmental or social impacts. See Guidance Document for more Information Impact [1 - 5]			3
Impact - Economic The predicted economic impacts of the pest in the UK. This includes direct effects on yield, quality and possible indirect effects such as trade implications. See Guidance Document for more Information Impact - Economic [1 - 5]		2
Impact - Environmental The proportion of the environmental value of the plant which is likely to be lost through the introduction of the pest. See Guidance Document for more Information Impact - Environmental [1 - 5]		2
Impact - Social The predicted social impacts of a pest in the UK, including effects on tourism, amenities and animal and human health. See Guidance Document for more Information Impact - Social [1 - 5]			3
Value at Risk The value of the hosts or industries at risk from this pest in the UK. See Guidance Document for more Information Value at Risk [1 - 5]				4
Likelihood x Impact The likelihood multiplied by the impact, which shows the risk to the sector. See Guidance Document for more Information Likelihood x Impact [1 - 25]	9
UK Relative Risk Rating Likelihood x Impact x Value at Risk. See Guidance Document for more Information UK Relative Risk Rating [1 - 125]	36

Proposed Actions

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Regulation

Deregulation

Management By Industry

Targeted Survey

PRA

Contingency Plan

Publicity

Research

Distribution and Pest Details

Distribution

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Country / Territory		Status
Europe
	Austria	Present
	Belgium	Present
	Bulgaria	Present
	Croatia	Present
	Czech Republic	Present
	France	Present
	Germany	Present
	Greece	Present
	Hungary	Present
	Italy	Present
	Montenegro	Present
	Netherlands	Present
	Poland	Present
	Portugal	Present
	Republic of North Macedonia	Present
	Romania	Present
	Russia	Present
	Serbia	Present
	Slovakia	Present
	Slovenia	Present
	Spain	Present
	Switzerland	Present
	Türkiye	Present
	United Kingdom	Present (Unknown Distribution)
North America
	Canada	Present
	Mexico	Present
	United States	Present
South America
	Argentina	Present
	Chile	Present
Oceania
	Australia	Present (Limited)
Africa
	South Africa	Present
Asia
	China	Present
	Georgia	Present
	Japan	Present
	South Korea	Present
	Uzbekistan	Present

Type of Pest

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Insect (Hemiptera)

Host or Industry at Risk

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Platanus

Major Hosts

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Broussonetia papyrifera (L.) Vent.
Carya ovata (Mill.) K.Koch
Chamaedaphne Moench
Fraxinus L.
Liquidambar styraciflua L.
Platanus L.
Platanus occidentalis L.
Platanus orientalis L.
Platanus racemosa Nutt.
Platanus wrightii P.Wats.
Platanus x acerifolia (Aiton) Willdenow
Quercus laurifolia Michx.

Threats to Protected Cultivation

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Forest Tree Pests and Pathogens

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Broadleaved

Further Information

PRA

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PRA Availability

Yes

Regulation and EPPO listing

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Not currently listed

Actions Indicated

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Action

No statutory action

General Comments

Lace bug which affects plane trees and which is present in a number of European countries. An outbreak in the UK in 2006 was eradicated, but in 2024 it was found in a limited number of trees in central London.

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Department for Environment, Food & Rural Affairs

Departmentfor EnvironmentFood & Rural Affairs

UK Risk Register Details for Corythucha ciliata

Common Names

PRA Document

Scenario and Pathways

Scenario for Risk Register

Pathway Assessed for Entry to UK

Common Pathways

Risk Ratings and Current Mitigations

Unmitigated Risks

Current Mitigations

Key mitigation for pest

Regulation

Surveillance

Industry Scheme

Contingency Plan

Awareness

Research

Mitigated Risks

Proposed Actions

Proposed Actions

Regulation

Deregulation

Management By Industry

Targeted Survey

PRA

Contingency Plan

Publicity

Research

Distribution and Pest Details

Distribution

Type of Pest

Host or Industry at Risk

Major Hosts

Threats to Protected Cultivation

Forest Tree Pests and Pathogens

Further Information

PRA

PRA Availability

Regulation and EPPO listing

Actions Indicated

Action

General Comments

Further Information

Uncertainty

Key uncertainty for pest

Climate

Current distribution

Hosts

Impact

Pathways

Regulation

Taxonomy

UK distribution

Risk Records for this Pest

Department
for Environment
Food & Rural Affairs