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UK Risk Register Details for Phytophthora lateralis

This record was last updated on 30/09/2022

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
  • Plants for planting (except seeds bulbs and tubers)
  • Soil/growing medium

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

Regulated non quarantine pest (Great Britain)



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 / Territory Status Notes
United Kingdom Present (Limited)
France Present
Ireland Present
Netherlands Present
North America Present
Canada Present
United States Present
South America
Argentina Present
Asia Present
Taiwan Present

Type of Pest

  • Oomycete

Host or Industry at Risk

  • show / hide

Chamaecyparis lawsoniana

Major Hosts

  • Chamaecyparis Spach
  • Chamaecyparis formosensis Matsum.
  • Chamaecyparis lawsoniana (Murr.) Parl.
  • Chamaecyparis obtusa Sieb. & Zucc. Ex Endl.
  • Chamaecyparis pisifera Sieb. & Zucc. Ex Endl.
  • Taxus brevifolia Nutt.
  • Thuja occidentalis L.

Threats to Protected Cultivation

Forest Tree Pests and Pathogens

  • Coniferous

Further Information

PRA Availability

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

Regulation and EPPO listing

  • show / hide

Regulated non quarantine pest (Great Britain). EPPO A2

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.

Risk Records for this Pest