Department for Environment, Food & Rural Affairs

Department
for Environment
Food & Rural Affairs

UK Risk Register Details for Unaspis citri

Pest has been archived

This pest has been assessed for the Risk Register and is considered to pose a low risk to the UK. The information on this pest was correct as of 14/08/2020, but is no longer actively maintained. It will only be updated if new information is received which indicates the potential for a significant increase in risk to the UK.

This record was last updated on 28/06/2021

Common Names

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Citrus snow scale
Orange chionaspis
White louse scale
white louse scale,

Scenario and Pathways

Scenario for Risk Register

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Pest is introduced

Pathway Assessed for Entry to UK

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Common Pathways

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

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

Current Mitigations

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Key mitigation for pest

Regulated quarantine pest (Northern Ireland)

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

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	Notes
Europe
	Portugal	Present (Limited)	Azores
	Malta	Present
	United Kingdom	Absent
North America
	Mexico	Present
	United States	Present
South America
	Argentina	Present
	Bolivia	Present
	Brazil	Present
	Chile	Present
	Colombia	Present
	Ecuador	Present
	French Guiana	Present
	Guyana	Present
	Paraguay	Present
	Peru	Present
	Uruguay	Present
	Venezuela	Present
Oceania
	Australia	Present
	Fiji	Present
	New Caledonia	Present
	New Zealand	Present
	Samoa	Present
	Solomon Islands	Present
	Tonga	Present
	Vanuatu	Present
	Wallis et Futuna	Present
Africa
	Benin	Present
	Cameroon	Present
	Congo (Brazzaville)	Present
	Congo (Democratic Rep.)	Present
	Cote d'Ivoire	Present
	Egypt	Present
	Gabon	Present
	Guinea	Present
	Madagascar	Present
	Mauritius	Present
	Niger	Present
	Nigeria	Present
	Senegal	Present
	Sierra Leone	Present
	Togo	Present
Asia
	China	Present
	Indonesia	Present
	Japan	Present
	Malaysia	Present
	Singapore	Present
	Syria	Present
	Vietnam	Present
	Yemen	Present
Central America
	Antigua and Barbuda	Present
	Barbados	Present
	Bermuda	Present
	British Virgin Islands	Present
	Cuba	Present
	Dominica	Present
	Dominican Republic	Present
	El Salvador	Present
	Grenada	Present
	Guadeloupe	Present
	Haiti	Present
	Honduras	Present
	Jamaica	Present
	Martinique	Present
	Panama	Present
	Puerto Rico	Present
	Saint Kitts and Nevis	Present
	Saint Lucia	Present
	Saint Vincent and the Grenadines	Present

Type of Pest

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Insect (Hemiptera)

Host or Industry at Risk

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Major Hosts

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Citrofortunella microcarpa (Bunge) Wijnands
Citrus limon (Linnaeus) N.L.Burman
Citrus paradisi Macfadyen
Citrus reticulata Blanco (S. S.)
Citrus sinensis (Linnaeus) Osbeck
Fortunella Swing.
Poncirus trifoliata (Linnaeus) Rafinesque
Citrus
Citroncirus

Threats to Protected Cultivation

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Forest Tree Pests and Pathogens

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Further Information

PRA

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PRA Availability

PRA not available

Regulation and EPPO listing

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Regulated quarantine pest (Northern Ireland). EPPO A1

Actions Indicated

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Action

No statutory action in Great Britain. Statutory action in line with regulations for Northern Ireland.

General Comments

Essentially a citrus scale insect pest, which occasionally occurs on other products.

Risk Records for this Pest

Unaspis citri [SELECTED] [ARCHIVED]

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Department for Environment, Food & Rural Affairs

Departmentfor EnvironmentFood & Rural Affairs

UK Risk Register Details for Unaspis citri

Pest has been archived

Common Names

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

Risk Records for this Pest

Department
for Environment
Food & Rural Affairs