UK Risk Register Details for Neotoxoptera formosana

Common Names

  • Onion aphid

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
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] 4
Impact [1 - 5] 2
Value at Risk [1 - 5] 4
Likelihood x Impact [1 - 25] 8
UK Relative Risk Rating [1 - 125] 32

Current Mitigations

  • show / hide

Key mitigation for pest

Action against findings under general powers



Industry Scheme

Contingency Plan



Mitigated Risks

Likelihood [1 - 5] 3
Spread [1 - 5] 4
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 Status Notes
Europe (4) Present
Germany Present
France Present
United Kingdom Present (Limited)
Italy Present
Netherlands Present
North America
Guadeloupe Present
Mexico Present
Panama Present
United States Present
South America
Argentina Present
Brazil Present
Chile Present
Venezuela Present
Australia Present
New Zealand Present
Papua New Guinea Present
Asia Present
China Present
Japan Present
South Korea Present
Taiwan Present

Type of Pest

  • Insect (Hemiptera)

Host or Industry at Risk

  • show / hide


Major Hosts

  • Allium L.

Threats to Protected Cultivation

Forest Tree Pests and Pathogens

Further Information

PRA Availability

'UK (2007) , EPPO (2000)'

EU and EPPO Listing

Not currently listed

Actions Indicated

  • show / hide


Further work needed to assess distribution needed using aphid traps.

General Comments

Allium pest with unknown but possibly widespread distribution in the UK. Plant Health service will continue to take action on isolated outbreaks pending further investigations into distribution. Industry may wish to monitor for its presence and take appropriate action as it could be economically damaging and may also have a role as a virus vector.

Risk Records for this Pest