• Pest is introduced

• Fruits or vegetables

• Plants for planting (except seeds bulbs and tubers)
• Bulbs or tubers
• Fruits or vegetables
• Soil/growing medium

× Likelihood For "Pest is Introduced" the lowest value of Entry or Establishment, as both are required for a successful introduction. For "Pest Spreads to Maximum Extent" this is an expert judgement on the likelihood of this occurrence. See Guidance Document for more Information Close Likelihood [1 - 5]		2
× Spread The rate at which a pest can expand, by natural dispersal only, within an area. See Guidance Document for more Information Close Spread [1 - 5]			3
× Impact The highest value from economic, environmental or social impacts. See Guidance Document for more Information Close Impact [1 - 5]			3
× Value at Risk The value of the hosts or industries at risk from this pest in the UK. See Guidance Document for more Information Close Value at Risk [1 - 5]					5
× Likelihood x Impact The likelihood multiplied by the impact, which shows the risk to the sector. See Guidance Document for more Information Close Likelihood x Impact [1 - 25]	6
× UK Relative Risk Rating Likelihood x Impact x Value at Risk. See Guidance Document for more Information Close UK Relative Risk Rating [1 - 125]	30

Key mitigation for pest

Prohibition of some pathways

Regulation

Surveillance

Industry Scheme

Contingency Plan

Awareness

Research

× Likelihood For "Pest is Introduced" the lowest value of Entry or Establishment, as both are required for a successful introduction. For "Pest Spreads to Maximum Extent" this is an expert judgement on the likelihood of this occurrence. See Guidance Document for more Information Close Likelihood [1 - 5]		2
× Spread The rate at which a pest can expand, by natural dispersal only, within an area. See Guidance Document for more Information Close Spread [1 - 5]			3
× Impact The highest value from economic, environmental or social impacts. See Guidance Document for more Information Close Impact [1 - 5]			3
× Value at Risk The value of the hosts or industries at risk from this pest in the UK. See Guidance Document for more Information Close Value at Risk [1 - 5]					5
× Likelihood x Impact The likelihood multiplied by the impact, which shows the risk to the sector. See Guidance Document for more Information Close Likelihood x Impact [1 - 25]	6
× UK Relative Risk Rating Likelihood x Impact x Value at Risk. See Guidance Document for more Information Close UK Relative Risk Rating [1 - 125]	30

Regulation

Deregulation

Management By Industry

Targeted Survey

PRA

Contingency Plan

Publicity

Research

Country / Territory			Status			Notes
Europe
	United Kingdom		Absent
North America
	United States		Unknown			Alaska- unknown if limited presence or interception
South America
	Chile		Present
	Brazil		Present
	Uruguay		Present
	Peru		Present
	Argentina		Present

• Insect (Diptera)

Alliums, brassicas, beans

• Allium L.
• Allium cepa L.
• Allium sativum L.
• Avena sativa L.
• Beta vulgaris L.
• Brassica L.
• Chenopodium quinoa Willd.
• Citrullus Schrad.
• Cucumis L.
• Cucurbita L.
• Helianthus annuus L.
• Lactuca sativa L.
• Linum usitatissimum L.
• Phaseolus L.
• Pisum sativum Linnaeus
• Solanum L.
• Triticum aestivum L.
• Vicia faba L.
• Zea mays L.
• Citrus

• N/A

PRA Availability

UK (1996) - outdated as species was redescribed in 2022

Not currently listed

Action

Statutory action on findings

General Comments

South American root maggot fly adapted to cooler climates, likely able to establish in the UK. The larvae feed on the roots and stems of brassicas, alliums and other crop species, causing reduced yields and plant death.

Key uncertainty for pest

Impacts on certain hosts

Climate

Current distribution

Hosts

Impact

Pathways

Regulation

Taxonomy

UK distribution