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UK Risk Register Details for 'Candidatus Phytoplasma asteris' in carrot

Pest has been archived

This pest has been assessed for the Risk Register and is considered to pose a low risk to the UK. The information on this pest was correct as of 18/05/2020, but is no longer actively maintained. It will only be updated if new information is received which indicates the potential for a significant increase in risk to the UK.

This record was last updated on 29/05/2020

Common Names

  • Aster yellows
  • AY
  • yellow disease phytoplasmas

Scenario and Pathways

Scenario for Risk Register

  • show / hide
  • Pest spreads to maximum extent

Pathway Assessed for Entry to UK

  • show / hide

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] 4
Likelihood x Impact [1 - 25] 6
UK Relative Risk Rating [1 - 125] 24

Current Mitigations

  • show / hide

Key mitigation for pest

Regulated non quarantine pest



Industry Scheme

Contingency Plan



Mitigated Risks

Likelihood [1 - 5] 3
Spread [1 - 5] 3
Impact [1 - 5] 2
Value at Risk [1 - 5] 4
Likelihood x Impact [1 - 25] 6
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)
Russia Present
Italy Present
Türkiye Present
Belgium Present
Czech Republic Present
Finland Present
France Present
Greece Present
Germany Present
Poland Present
Spain Present
Lithuania Present
Slovenia Present
Croatia Present
Estonia Present
Netherlands Present
North America
Canada Present
United States Present
Mexico Present
South America
Brazil Present
Peru Present
South Africa Present
Israel Present
China Present
India Present
Japan Present
Lebanon Present
Malaysia Present
South Korea Present
Myanmar Present
Taiwan Present
Thailand Present
Saudi Arabia Present
Central America
Cuba Present

Type of Pest

  • Phytoplasma

Host or Industry at Risk

  • show / hide

Daucus carota

Major Hosts

  • Allium L.
  • Amaranthus L.
  • Anemone coronaria L.
  • Anethum graveolens L.
  • Apium graveolens L.
  • Callistephus chinensis (L.) Nees
  • Capsicum annuum L.
  • Catharanthus roseus (L.) G.Don
  • Chrysanthemum L.
  • Daucus carota L.
  • Delphinium L.
  • Fragaria L.
  • Gladiolus hybrids
  • Gramineae Adans., Nom. Cons.
  • Lactuca sativa L.
  • Morus alba L.
  • Oenothera L.
  • Paulownia Sieb. & Zucc.
  • Populus L.
  • Primula L.
  • Prunus avium ssp./var. avium L.
  • Prunus cerasus L.
  • Rosa L.
  • Senecio jacobaea L.
  • Solanum melongena L.
  • Solanum tuberosum L.
  • Tagetes L.
  • Tilia L.
  • Trifolium L.
  • Vaccinium L.
  • Veronica scutellata L.
  • Vicia faba L.
  • Zea mays L.
  • Asteraceae (family)
  • Hydrangea macrophylla

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

  • show / hide

Regulated non quarantine pest

Actions Indicated

  • show / hide


No statutory action against findings in carrot crops.

General Comments

Phytoplasma present in Europe and beyond now detected in carrots in the UK. Possibly more widespread than currently detected but serious economic impacts have not been observed elsewhere in Europe.