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

  • A leaf gall nematode

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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This section is currently being developed as part of the next phase of the Risk Register.

Risk Ratings and Current Mitigations

Unmitigated Risks

Likelihood [1 - 5] 3
Spread [1 - 5] 4
Impact [1 - 5] 5
Value at Risk [1 - 5] 5
Likelihood x Impact [1 - 25] 15
UK Relative Risk Rating [1 - 125] 75

Current Mitigations

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Key mitigation for pest

There are no specific measures against Fagus species being imported from the US, but point 66 of schedule 4 of the Plant Health Order require imported beech to be accompanied by an official statement that they have been grown in a nursery, have been found to be free from signs of harmful nematodes and are free from plant debris, flowers and fruits. Additionally, point 66 requires that they are dormant and free of leaves.



Industry Scheme

Contingency Plan



Mitigated Risks

Likelihood [1 - 5] 3
Spread [1 - 5] 4
Impact [1 - 5] 5
Value at Risk [1 - 5] 5
Likelihood x Impact [1 - 25] 15
UK Relative Risk Rating [1 - 125] 75

Proposed Actions

Proposed Actions



Management By Industry

Targeted Survey


Contingency Plan



Distribution and Pest Details


Country Status Notes
United Kingdom Absent
North America
Canada Present (Limited)
United States Present (Limited)
Japan Present (Widespread)

Type of Pest

  • Nematode (Tylenchida)

Host or Industry at Risk

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Major Hosts

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

Threats to Protected Cultivation

  • Both protected crops and outdoor production

Forest Tree Pests and Pathogens

  • Broadleaved

Further Information

PRA Availability

PRA not available

Regulation and EPPO listing

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EPPO Alert (2019)

Actions Indicated

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Statutory action against interceptions

General Comments

Nematode associated with Beech leaf disease in North America and Japan. A risk assessment will help better determine the level of risk to the UK.

Further Information


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Key uncertainty for pest

Lack of information about this pest’s biology.

Climate - Cause

Current distribution - Cause

Hosts - Cause

Impact - Cause

Pathways - Cause

Regulation - Cause

Taxonomy - Cause

UK distribution - Cause

Risk Records for this Pest