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UK Risk Register Details for Erysiphe euphorbiicola

This record was last updated on 13/08/2021

Scenario and Pathways

Scenario for Risk Register

  • show / hide
  • Pest is introduced

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)

Risk Ratings and Current Mitigations

Unmitigated Risks

Likelihood [1 - 5] 3
Spread [1 - 5] 3
Impact [1 - 5] 2
Value at Risk [1 - 5] 3
Likelihood x Impact [1 - 25] 6
UK Relative Risk Rating [1 - 125] 18

Current Mitigations

  • show / hide

Key mitigation for pest

Industry production systems



Industry Scheme

Contingency Plan



Mitigated Risks

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

Proposed Actions

Proposed Actions



Management By Industry

Targeted Survey


Contingency Plan



Distribution and Pest Details


Country / Territory Status Notes
United Kingdom Absent
North America
United States Present (Limited)
Mexico Present
South America
Venezuela Present
Central America
Puerto Rico Present
Cuba Present
Dominican Republic Present

Type of Pest

  • Fungus

Host or Industry at Risk

  • show / hide

Euphorbia pulcherrima

Major Hosts

  • Euphorbia corollata L.
  • Euphorbia dentata Michaux
  • Euphorbia glomerifera (= glomifera) (Millsp.) L.C.Wheeler
  • Euphorbia heterophylla L.
  • Euphorbia hypericifolia L.
  • Euphorbia hyssopifolia L.
  • Euphorbia maculata L.
  • Euphorbia marginata Pursh
  • Euphorbia pulcherrima Willd. ex Klotzsch
  • Euphorbia supina Raf. Ex Boiss./Robin.
  • Euphorbia thymifolia L.
  • Manihot esculenta Crantz

Threats to Protected Cultivation

  • Only protected crops

Forest Tree Pests and Pathogens

  • N/A

Further Information

PRA Availability

UK (2002)

Regulation and EPPO listing

  • show / hide

Not currently listed

Actions Indicated

  • show / hide


Statutory action against findings.

General Comments

Powdery mildew of poinsettia and related hosts. Appears to be effectively controlled by industry at present through existing control measures for other powdery mildews. Specific regulation is likely to be appropriate. Update of UK PRA to assess current information will help to assess the risk.

Risk Records for this Pest