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UK Risk Register Details for Frankliniella occidentalis

Pest has been archived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 The information on this pest was correct as of 05/11/2019, but is no longer actively maintained.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 13/08/2021

Common Names

  • alfalfa thrips
  • western flower thrips

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)
  • Cut flowers or branches
  • Fruits or vegetables

Risk Ratings and Current Mitigations

Unmitigated Risks

Likelihood [1 - 5] 2
Spread [1 - 5] 2
Impact [1 - 5] 4
Value at Risk [1 - 5] 5
Likelihood x Impact [1 - 25] 8
UK Relative Risk Rating [1 - 125] 40

Current Mitigations

  • show / hide

Key mitigation for pest

Unregulated, but significant industry experience from past action



Industry Scheme

Contingency Plan



Mitigated Risks

Likelihood [1 - 5] 2
Spread [1 - 5] 2
Impact [1 - 5] 3
Value at Risk [1 - 5] 5
Likelihood x Impact [1 - 25] 6
UK Relative Risk Rating [1 - 125] 30

Proposed Actions

Proposed Actions



Management By Industry

Targeted Survey


Contingency Plan



Distribution and Pest Details


Country / Territory Status Notes
United Kingdom Present (Widespread)
Belgium Present
Bulgaria Present
Croatia Present
Cyprus Present
Czech Republic Present
Denmark Present
Estonia Present
Finland Present
France Present
Germany Present
Greece Present
Guernsey Present
Hungary Present
Ireland Present
Italy Present
Latvia Present
Lithuania Present
Austria Present
Malta Present
Netherlands Present
Poland Present
Portugal Present
Albania Present
Romania Present
Bosnia-Herzegovina Present
Slovakia Present
Republic of North Macedonia Present
Slovenia Present
Montenegro Present
Spain Present
Norway Present
Sweden Present
Russia Present
Serbia Present
Switzerland Present
Turkey Present
Ukraine Present
North America Present
Canada Present
Mexico Present
United States Present
South America Present
Argentina Present
Brazil Present
Chile Present
Colombia Present
Ecuador Present
French Guiana Present
Guyana Present
Peru Present
Uruguay Present
Venezuela Present
Oceania Present
Australia Present
New Zealand Present
Africa Present
Algeria Present
Morocco Present
Kenya Present
Reunion Present
South Africa Present
[Kingdom of] eSwatini Present
Uganda Present
Zimbabwe Present
Azerbaijan Present
China Present
Iran Present
India Present
Israel Present
Japan Present
Kazakhstan Present
South Korea Present
Kuwait Present
Malaysia Present
Singapore Present
Sri Lanka Present
Thailand Present
Uzbekistan Present
Russia Present
Central America
Costa Rica Present
Dominican Republic Present
Guadeloupe Present
Guatemala Present
Martinique Present
Puerto Rico Present

Type of Pest

  • Insect (Thysanoptera)

Host or Industry at Risk

  • show / hide

Total protected cultivation

Major Hosts

  • Allium cepa L.
  • Capsicum annuum L.
  • Cucumis sativus L.
  • Cucurbitaceae
  • Daucus carota subsp. sativus
  • Chrysanthemum x morifolium Ramat.
  • Dianthus caryophyllus L.
  • Fragaria ananassa (F. x ananassa) Duch.
  • Gerbera jamesonii H.Bolus Ex Hook.F.
  • Gladiolus hybrids
  • Lathyrus odoratus L.
  • Solanum lycopersicum L.
  • Medicago sativa L.
  • Nicotiana tabacum L.
  • Phaseolus vulgaris L.
  • Pisum sativum Linnaeus
  • Prunus armeniaca L.
  • Prunus domestica ssp. domestica L.
  • Prunus persica Batsch
  • Rosa L.
  • Rosa Large-flowered bush hybrids
  • Sinningia speciosa (Lodd.) Hiern
  • Streptocarpus Lindl.
  • Vitis vinifera ssp. vinifera L.

Threats to Protected Cultivation

  • Only protected crops

Forest Tree Pests and Pathogens

Further Information

PRA Availability

PRA not available

Regulation and EPPO listing

  • show / hide


Actions Indicated

  • show / hide


No statutory action

General Comments

Damaging polyphagous glasshouse pest, present in UK since 1986, managed by industry.