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UK Risk Register Details for Ditylenchus dipsaci

This record was last updated on 02/03/2023

Common Names

  • 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

  • show / hide
  • Pest spreads to maximum extent

Pathway Assessed for Entry to UK

  • show / hide

Common Pathways

  • show / hide
  • Bulbs or tubers
  • Seeds
  • Fruits or vegetables

Risk Ratings and Current Mitigations

Unmitigated Risks

Likelihood [1 - 5] 5
Spread [1 - 5] 1
Impact [1 - 5] 4
Value at Risk [1 - 5] 5
Likelihood x Impact [1 - 25] 20
UK Relative Risk Rating [1 - 125] 100

Current Mitigations

  • show / hide

Key mitigation for pest

Regulated non quarantine pest



Industry Scheme

Contingency Plan



Mitigated Risks

Likelihood [1 - 5] 2
Spread [1 - 5] 1
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
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
Australia Present (Limited)
New Zealand Present (Widespread)
Kenya Present
Algeria Present
Morocco Present
Reunion Present
South Africa Present (Limited)
Tunisia Present
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

  • Nematode (Tylenchida)

Host or Industry at Risk

  • show / hide

Total outdoor production

Major Hosts

  • 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

Forest Tree Pests and Pathogens

Further Information

PRA Availability

PRA not available

Regulation and EPPO listing

  • show / hide

Regulated non quarantine pest

Actions Indicated

  • show / hide


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