Department for Environment, Food & Rural Affairs

Department
for Environment
Food & Rural Affairs

UK Risk Register Details for Ditylenchus dipsaci

This record was last updated on 02/03/2023

Common Names

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Beef stem nematode
Brown ring disease of hyacynth
Bud and stem nematode
Bulb eelworm
Clover stem nematode
Nemadode, stem
Nematode, stem and bulb
Onion bloat
Onion stem nematode
Phlox stem nematode
Ring disease of bulbs
Stem and bulb eelworm
Stem and bulb nematode
Stem nematode
Tulip root nnematode

Scenario and Pathways

Scenario for Risk Register

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Pest spreads to maximum extent

Pathway Assessed for Entry to UK

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Common Pathways

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Bulbs or tubers
Seeds
Fruits or vegetables

Risk Ratings and Current Mitigations

Unmitigated Risks

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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 Likelihood [1 - 5]			5
Entry The Likelihood of movement of the pest into the UK on a pathway and transfer of that pest to a suitable host. See Guidance Document for more Information Entry [1 - 5]
Establishment The likelihood of the pest surviving and perpetuating in the UK for the foreseeable future after it has entered. See Guidance Document for more Information Establishment [1 - 5]
Spread The rate at which a pest can expand, by natural dispersal only, within an area. See Guidance Document for more Information Spread [1 - 5]	1
Impact The highest value from economic, environmental or social impacts. See Guidance Document for more Information Impact [1 - 5]		4
Impact - Economic The predicted economic impacts of the pest in the UK. This includes direct effects on yield, quality and possible indirect effects such as trade implications. See Guidance Document for more Information Impact - Economic [1 - 5]		4
Impact - Environmental The proportion of the environmental value of the plant which is likely to be lost through the introduction of the pest. See Guidance Document for more Information Impact - Environmental [1 - 5]	1
Impact - Social The predicted social impacts of a pest in the UK, including effects on tourism, amenities and animal and human health. See Guidance Document for more Information Impact - Social [1 - 5]	1
Value at Risk The value of the hosts or industries at risk from this pest in the UK. See Guidance Document for more Information 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 Likelihood x Impact [1 - 25]	20
UK Relative Risk Rating Likelihood x Impact x Value at Risk. See Guidance Document for more Information UK Relative Risk Rating [1 - 125]	100

Current Mitigations

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Key mitigation for pest

Regulated non quarantine pest

Regulation

Surveillance

Industry Scheme

Contingency Plan

Awareness

Research

Mitigated Risks

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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 Likelihood [1 - 5]		2
Entry The Likelihood of movement of the pest into the UK on a pathway and transfer of that pest to a suitable host. See Guidance Document for more Information Entry [1 - 5]
Establishment The likelihood of the pest surviving and perpetuating in the UK for the foreseeable future after it has entered. See Guidance Document for more Information Establishment [1 - 5]
Spread The rate at which a pest can expand, by natural dispersal only, within an area. See Guidance Document for more Information Spread [1 - 5]	1
Impact The highest value from economic, environmental or social impacts. See Guidance Document for more Information Impact [1 - 5]			3
Impact - Economic The predicted economic impacts of the pest in the UK. This includes direct effects on yield, quality and possible indirect effects such as trade implications. See Guidance Document for more Information Impact - Economic [1 - 5]			3
Impact - Environmental The proportion of the environmental value of the plant which is likely to be lost through the introduction of the pest. See Guidance Document for more Information Impact - Environmental [1 - 5]	1
Impact - Social The predicted social impacts of a pest in the UK, including effects on tourism, amenities and animal and human health. See Guidance Document for more Information Impact - Social [1 - 5]	1
Value at Risk The value of the hosts or industries at risk from this pest in the UK. See Guidance Document for more Information 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 Likelihood x Impact [1 - 25]	6
UK Relative Risk Rating Likelihood x Impact x Value at Risk. See Guidance Document for more Information UK Relative Risk Rating [1 - 125]	30

Proposed Actions

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Regulation

Deregulation

Management By Industry

Targeted Survey

PRA

Contingency Plan

Publicity

Research

Distribution and Pest Details

Distribution

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Country / Territory		Status	Notes
Europe		Present	cosmopolitan
	United Kingdom	Present (Widespread)
North America
	Canada	Present
	Mexico	Present
	United States	Present (Widespread)
South America
	Argentina	Present
	Bolivia	Present
	Brazil	Present
	Chile	Present
	Colombia	Present
	Ecuador	Present
	Paraguay	Present
	Peru	Present
	Uruguay	Present
	Venezuela	Present
Oceania
	Australia	Present (Limited)
	New Zealand	Present (Widespread)
Africa
	Kenya	Present
	Algeria	Present
	Morocco	Present
	Reunion	Present
	South Africa	Present (Limited)
	Tunisia	Present
Asia
	Indonesia	Present
	China	Present
	India	Present
	Iran	Present
	Iraq	Present
	Israel	Present (Widespread)
	Japan	Present
	Kazakhstan	Present
	South Korea	Present
	Kyrgyzstan	Present
	Oman	Present
	Pakistan	Present
	Syria	Present
	Uzbekistan	Present
	Yemen	Present
Central America
	Costa Rica	Present
	Dominican Republic	Present
	Haiti	Present

Type of Pest

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Nematode (Tylenchida)

Host or Industry at Risk

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Total outdoor production

Major Hosts

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Allium L.
Allium cepa L.
Allium porrum L.
Allium sativum L.
Allium schoenoprasum L.
Avena sativa L.
Beta vulgaris L.
Camassia Lindl.
Camassia cusickii S.Wats.
Chionodoxa Boiss.
Chionodoxa luciliae Boiss.
Crocus flavus Weston
Fragaria L.
Fragaria ananassa (F. x ananassa) Duch.
Galanthus L.
Galanthus nivalis L.
Hyacinthus L.
Hyacinthus orientalis L.
Hymenocallis Salisb.
Hymenocallis x festalis Hortulanorum Ex Schmarse
Medicago sativa L.
Muscari Mill.
Muscari botryoides (L.) Mill. em.Dc.
Narcissus L.
Nicotiana tabacum L.
Ornithogalum L.
Ornithogalum umbellatum L.
Phlox drummondii Hook.
Phlox paniculata L.
Pisum sativum Linnaeus
Puschkinia scilloides var. libanotica Adams
Ribes L.
Scilla L.
Scilla sibirica Haw.
Secale cereale L.
Solanum tuberosum L.
Sternbergia Waldst. & Kit.
Trifolium pratense L.
Trifolium repens L.
Tulipa L.
Tulipa hybrids
Vicia faba L.
Zea mays L.

Threats to Protected Cultivation

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Forest Tree Pests and Pathogens

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Further Information

PRA

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PRA Availability

PRA not available

Regulation and EPPO listing

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Regulated non quarantine pest

Actions Indicated

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Action

Statutory action in line with legislation.

General Comments

Damaging nematode, widespread in UK and elsewhere, main risk is if it reaches propagating material. Regulations and the Plant Health Propagation Scheme mitigates against this.

Risk Records for this Pest

Ditylenchus dipsaci [SELECTED]

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Department for Environment, Food & Rural Affairs

Departmentfor EnvironmentFood & Rural Affairs

UK Risk Register Details for Ditylenchus dipsaci

Common Names

Scenario and Pathways

Scenario for Risk Register

Pathway Assessed for Entry to UK

Common Pathways

Risk Ratings and Current Mitigations

Unmitigated Risks

Current Mitigations

Key mitigation for pest

Regulation

Surveillance

Industry Scheme

Contingency Plan

Awareness

Research

Mitigated Risks

Proposed Actions

Proposed Actions

Regulation

Deregulation

Management By Industry

Targeted Survey

PRA

Contingency Plan

Publicity

Research

Distribution and Pest Details

Distribution

Type of Pest

Host or Industry at Risk

Major Hosts

Threats to Protected Cultivation

Forest Tree Pests and Pathogens

Further Information

PRA

PRA Availability

Regulation and EPPO listing

Actions Indicated

Action

General Comments

Risk Records for this Pest

Department
for Environment
Food & Rural Affairs