UK Risk Register Details for Spiroplasma citri

Common Names

  • Acorn disease
  • Citrus little leaf
  • Citrus stubborn disease
  • Little leaf of citrus
  • Stubborn disease of citrus

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
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] 3
Impact [1 - 5] 3
Value at Risk [1 - 5] 4
Likelihood x Impact [1 - 25] 9
UK Relative Risk Rating [1 - 125] 36

Current Mitigations

  • show / hide

Key mitigation for pest

EU regulated pest



Industry Scheme

Contingency Plan



Mitigated Risks

Likelihood [1 - 5] 3
Spread [1 - 5] 3
Impact [1 - 5] 3
Value at Risk [1 - 5] 4
Likelihood x Impact [1 - 25] 9
UK Relative Risk Rating [1 - 125] 36

Proposed Actions

Proposed Actions



Management By Industry

Targeted Survey


Contingency Plan



Distribution and Pest Details


Country Status Notes
Cyprus Present
Spain Present
France Present (Limited)
United Kingdom Absent
Italy Present
Turkey Present
North America Present
Mexico Present
United States Present
South America See Notes
Suriname Present
Venezuela Present
Oceania Present
New Zealand Present
Africa Present
Algeria Present
Egypt Present
Libya Present
Morocco Present
Madagascar Present
Sudan Present
Somalia Present
Tunisia Present
Asia Present
United Arab Emirates Present
Israel Present
Iraq Present
Iran Present
Jordan Present
Lebanon Present
Malaysia Present
Oman Present
Pakistan Present
Yemen Present

Type of Pest

  • Bacterium

Host or Industry at Risk

  • show / hide

Daucus carota

Major Hosts

  • Armoracia lapathifolia Gilib. Ex Usteri
  • Catharanthus roseus (L.) G.Don
  • Citrus aurantium subsp. aurantium Linnaeus
  • Citrus limon (Linnaeus) N.L.Burman
  • Citrus paradisi Macfadyen
  • Citrus reticulata (s.l.)
  • Citrus sinensis (Linnaeus) Osbeck
  • Daucus carota L.
  • Fortunella Swing.
  • Poncirus trifoliata (Linnaeus) Rafinesque
  • Citrus
  • Amaranthaceae (family)

Threats to Protected Cultivation

Forest Tree Pests and Pathogens

Further Information

PRA Availability

PRA not available

EU and EPPO Listing


Actions Indicated

  • show / hide


Statutory action against findings. Update to EU regulations required and industry research should be encouraged.

General Comments

Bacterial pest affecting citrus and field vegetables now present in parts of the EU. Carrots are the main crop potentially at risk, but main vectors responsible for transmission are unlikely to establish in the UK. EU regulations should be updated to reflect extended host range. Industry may be interested in pursuing research to investigate impacts on field vegetables.

Risk Records for this Pest