UK Risk Register Details for 'Candidatus Phytoplasma mali'

This record was last updated on 08/01/2021

Common Names

  • Phytoplasma mali
  • Proliferation of apple
  • Witches broom of apple

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] 4
Spread [1 - 5] 3
Impact [1 - 5] 4
Value at Risk [1 - 5] 4
Likelihood x Impact [1 - 25] 16
UK Relative Risk Rating [1 - 125] 64

Current Mitigations

  • show / hide

Key mitigation for pest

Regulated quarantine pest (Great Britain. Northern Ireland may differ)



Industry Scheme

Contingency Plan



Mitigated Risks

Likelihood [1 - 5] 3
Spread [1 - 5] 3
Impact [1 - 5] 4
Value at Risk [1 - 5] 4
Likelihood x Impact [1 - 25] 12
UK Relative Risk Rating [1 - 125] 48

Proposed Actions

Proposed Actions



Management By Industry

Targeted Survey


Contingency Plan



Distribution and Pest Details


Country Status Notes
United Kingdom Absent
Belarus Present
Spain Present
Croatia Present
Austria Present
Belgium Present
Bulgaria Present
Czech Republic Present
France Present
Germany Present
Greece Present
Hungary Present
Italy Present
Netherlands Present
Poland Present
Romania Present
Slovakia Present
Slovenia Present
Albania Present
Bosnia-Herzegovina Present
Moldova Present
Serbia Present
Russia Present
Switzerland Present
Turkey Present
Ukraine Present
Finland Present
North America
Canada Present (Limited)

Type of Pest

  • Phytoplasma

Host or Industry at Risk

  • show / hide


Major Hosts

  • Dahlia Cav.
  • Forsythia suspensa var. suspensa (Thunb.) Vahl
  • Lilium hybrids
  • Malus Mill.
  • Malus domestica Borkhausen
  • Prunus avium ssp./var. avium L.
  • Prunus cerasus L.
  • Pyrus pyraster Burgsd.
  • Spiraea x vanhouttei (Briot) Zabel
  • Viburnum lantana L.

Threats to Protected Cultivation

Forest Tree Pests and Pathogens

Further Information

PRA Availability

Norway (2012)

Regulation and EPPO listing

  • show / hide

Regulated quarantine pest (Great Britain. Northern Ireland may differ). EPPO A2

Actions Indicated

  • show / hide


Statutory action against findings

General Comments

Phytoplasma which causes apple proliferation disease in Europe.

Risk Records for this Pest