UK Risk Register Details for Hop stunt viroid

Common Names

  • Citrus little leaf
  • Little leaf of citrus
  • Sour orange stem pitting
  • Stem pitting of sour orange
  • Xyloporosis 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] 4
Spread [1 - 5] 2
Impact [1 - 5] 4
Value at Risk [1 - 5] 3
Likelihood x Impact [1 - 25] 16
UK Relative Risk Rating [1 - 125] 48

Current Mitigations

  • show / hide

Key mitigation for pest

Industry certification scheme for planting material



Industry Scheme

Contingency Plan



Mitigated Risks

Likelihood [1 - 5] 3
Spread [1 - 5] 2
Impact [1 - 5] 4
Value at Risk [1 - 5] 3
Likelihood x Impact [1 - 25] 12
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
Europe Present
Austria Present
Cyprus Present
Czech Republic Present
Spain Present
Finland Present
France Present
United Kingdom Absent
Greece Present
Italy Present
Netherlands Present
Portugal Present
Serbia Present
North America Present
Jamaica Present
Trinidad and Tobago Present
United States Present (Limited)
South America Present
Argentina Present
Brazil Present
Colombia Present
Ecuador Present
Suriname Present
Venezuela Present
New Zealand Present
Africa Present
Algeria Present
Egypt Present
Morocco Present
Nigeria Present
Sudan Present
Tunisia Present
South Africa Present
China Present
Israel Present
India Present
Iran Present
Jordan Present
Japan Present
South Korea Present
Lebanon Present
Philippines Present
Saudi Arabia Present
Syria Present
Thailand Present
Yemen Present

Type of Pest

  • Virus or Viroid

Host or Industry at Risk

  • show / hide

Humulus lupulus, Prunus, Cucumis

Major Hosts

  • Citrus limon (Linnaeus) N.L.Burman
  • Citrus paradisi Macfadyen
  • Citrus reticulata (s.l.)
  • Citrus sinensis (Linnaeus) Osbeck
  • Cucumis sativus L.
  • Ficus L.
  • Humulus lupulus L.
  • Malus Mill.
  • Prunus L.
  • Pyrus L.
  • Vitis L.

Threats to Protected Cultivation

  • Both protected crops and outdoor production

Forest Tree Pests and Pathogens

Further Information

PRA Availability

UK (2014)

EU and EPPO Listing

Not currently listed

Actions Indicated

  • show / hide


Statutory action will be taken and EU regulation to be pursued. Benefits of certification in maintaining disease freedom to be publicised.

General Comments

Pest of hops present in America and parts of Europe. PHPS provides good assurance of disease freedom, but EU regulation to be pursued to enhance protection in the longer term.

Risk Records for this Pest