Department for Environment, Food & Rural Affairs

Department
for Environment
Food & Rural Affairs

UK Risk Register Details for Litylenchus crenatae

Please note: there are high levels of uncertainty associated with the risk scores for this pest.

This record was last updated on 06/02/2026

Common Names

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A leaf gall nematode

PRA Document

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PRA File (2026)

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)
nematodes

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]		3
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]			4
Impact The highest value from economic, environmental or social impacts. See Guidance Document for more Information Impact [1 - 5]				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]				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]				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]		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]				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]	15
UK Relative Risk Rating Likelihood x Impact x Value at Risk. See Guidance Document for more Information UK Relative Risk Rating [1 - 125]	75

Current Mitigations

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Key mitigation for pest

Temporary prohibition of key pathway

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]				4
Impact The highest value from economic, environmental or social impacts. See Guidance Document for more Information Impact [1 - 5]					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]					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]					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]			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]					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

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
	United Kingdom	Absent
North America
	Canada	Present (Limited)
	United States	Present (Limited)
Asia
	Japan	Present

Type of Pest

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Nematode (Tylenchida)

Host or Industry at Risk

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Fagus

Major Hosts

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Fagus crenata Blume
Fagus engleriana Seemen
Fagus grandifolia Ehrh.
Fagus sylvatica ssp. orientalis L.
Fagus sylvatica L.

Threats to Protected Cultivation

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Both protected crops and outdoor production

Forest Tree Pests and Pathogens

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Broadleaved

Further Information

PRA

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PRA Availability

UK, 2026

Regulation and EPPO listing

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EPPO Alert (2019)

Actions Indicated

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Action

Statutory action against findings

General Comments

Nematode which causes beech leaf disease in North America and Japan. Potential risk to beech, which is widely grown in the UK.

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Department for Environment, Food & Rural Affairs

Departmentfor EnvironmentFood & Rural Affairs

UK Risk Register Details for Litylenchus crenatae

Please note: there are high levels of uncertainty associated with the risk scores for this pest.

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