UK Risk Register Details for Phytophthora lateralis

Common Names

  • Root rot: Chamaecyparis spp.

Scenario and Pathways

Scenario for Risk Register

  • show / hide
  • Pest spreads to maximum extent

Pathway Assessed for Entry to UK

  • show / hide
  • Plants for planting (except seeds bulbs and tubers)

Common Pathways

  • show / hide
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] 5
Spread [1 - 5] 3
Impact [1 - 5] 3
Value at Risk [1 - 5] 2
Likelihood x Impact [1 - 25] 15
UK Relative Risk Rating [1 - 125] 30

Current Mitigations

  • show / hide

Key mitigation for pest

Action against findings under general powers



Industry Scheme

Contingency Plan



Mitigated Risks

Likelihood [1 - 5] 4
Spread [1 - 5] 3
Impact [1 - 5] 3
Value at Risk [1 - 5] 2
Likelihood x Impact [1 - 25] 12
UK Relative Risk Rating [1 - 125] 24

Proposed Actions

Proposed Actions



Management By Industry

Targeted Survey


Contingency Plan



Distribution and Pest Details


Country Status Notes
Europe Present
France Present
United Kingdom Present (Limited)
Ireland Present
Netherlands Present
North America Present
Canada Present
United States Present
Asia Present
Taiwan Present

Type of Pest

  • Oomycete

Host or Industry at Risk

  • show / hide

Chamaecyparis lawsoniana

Major Hosts

  • Chamaecyparis lawsoniana (Murr.) Parl.
  • Chamaecyparis pisifera Sieb. & Zucc. Ex Endl.

Threats to Protected Cultivation

Forest Tree Pests and Pathogens

  • Coniferous

Further Information

PRA Availability

UK (2006), EPPO (2006), UK (2015)

EU and EPPO Listing


Actions Indicated

  • show / hide


Statutory action against findings in commercially traded plants, but not in the wider environment.

General Comments

Pathogen which affects mainly Lawson’s cypress, with limited distribution in UK and also present in some other European countries and beyond. Actions to reduce spread have been taken in the UK, but no prospect of EU regulation due to establishment elsewhere. Statutory action would be taken against findings in commercially traded plants to reduce prospects for spread.

Risk Records for this Pest