Department for Environment, Food & Rural Affairs

Department
for Environment
Food & Rural Affairs

UK Risk Register Details for Comstockaspis perniciosa

Pest has been archived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 The information on this pest was correct as of 08/01/2021, but is no longer actively maintained.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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Californian scale
Chinese scale
Pernicious scale
San Jose scale

PRA Document

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PRA File (2009)

Scenario and Pathways

Scenario for Risk Register

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Pest is introduced

Pathway Assessed for Entry to UK

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Plants for planting (except seeds bulbs and tubers)

Common Pathways

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Plants for planting (except seeds bulbs and tubers)

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]			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]			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]			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]		2
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]	1
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]	1
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]			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]	10
UK Relative Risk Rating Likelihood x Impact x Value at Risk. See Guidance Document for more Information UK Relative Risk Rating [1 - 125]	50

Current Mitigations

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Key mitigation for pest

Regulated non 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]		2
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]		2
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]			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]		2
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]	1
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]	1
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]			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]	4
UK Relative Risk Rating Likelihood x Impact x Value at Risk. See Guidance Document for more Information UK Relative Risk Rating [1 - 125]	20

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
	Austria	Present
	Bulgaria	Present
	Croatia	Present
	Czech Republic	Present
	France	Present
	Germany	Present
	Greece	Present
	Hungary	Present
	Italy	Present
	Netherlands	Present
	Poland	Absent	pest eradicated
	Portugal	Present
	Romania	Present
	Slovakia	Present
	Slovenia	Present
	Albania	Present
	Moldova	Present
	Russia	Present
	Serbia	Present
	Spain	Present
	Switzerland	Present
	Türkiye	Present
	Ukraine	Present
	United Kingdom	Absent
	Sweden	Present
North America		Present
	Canada	Present (Limited)
	United States	Present (Limited)
	Mexico	Present
South America		Present
	Argentina	Present
	Bolivia	Present
	Brazil	Present
	Chile	Present
	Ecuador	Present
	Paraguay	Present
	Peru	Present
	Uruguay	Present
	Venezuela	Present
Oceania		Present
	Australia	Present
	New Zealand	Present
Africa		Present
	Algeria	Present
	Congo (Democratic Rep.)	Present
	Morocco	Present
	South Africa	Present
	Tunisia	Present
	Zimbabwe	Present
Asia		Present
	Azerbaijan	Present
	Georgia	Present
	Afghanistan	Present
	China	Present
	India	Present
	Iran	Present
	Iraq	Present
	Japan	Present
	North Korea	Present
	South Korea	Present
	Kyrgyzstan	Present
	Nepal	Present
	Pakistan	Present
	Tajikistan	Present
	Uzbekistan	Present
	Vietnam	Present
Central America
	Cuba	Present

Type of Pest

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Insect (Hemiptera)

Host or Industry at Risk

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Orchard crops, Ribes, Rubus

Major Hosts

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Actinidia chinensis Planch.
Chaenomeles Bartl.
Cornus sanguinea L.
Cotoneaster Ehrh.
Crataegus L.
Cydonia oblonga Mill.
Fagus L.
Juglans regia L.
Juglans
Malus Mill.
Malus domestica Borkhausen
Mespilus germanica L.
Morus L.
Prunus L.
Prunus armeniaca L.
Prunus avium ssp./var. avium L.
Prunus cerasus L.
Prunus domestica ssp. domestica L.
Prunus dulcis (Mill.) D.A.Webb
Prunus persica Batsch
Prunus salicina Lindl.
Pyrus L.
Pyrus pyraster Burgsd.
Ribes L.
Rosa L.
Rubus L.
Sorbus L.
Symphoricarpos rivularis Suksdorf
Vaccinium L.

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

UK (2009)

Regulation and EPPO listing

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Regulated non quarantine pest (Northern Ireland) (as Quadraspidotus perniciosus), EPPO A2

Actions Indicated

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Action

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

General Comments

Polyphagous scale insect pest. UK PRA concluded this pest was likely only to be of minor importance in the UK.

Risk Records for this Pest

Comstockaspis perniciosa [SELECTED] [ARCHIVED]

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Department for Environment, Food & Rural Affairs

Departmentfor EnvironmentFood & Rural Affairs

UK Risk Register Details for Comstockaspis perniciosa

Pest has been archived

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

Risk Records for this Pest

Department
for Environment
Food & Rural Affairs