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UK Risk Register Details for Stegophora ulmea

This record was last updated on 10/03/2020

Common Names

  • Black spot of elm
  • Elm black spot
  • Leaf spot of elm

Scenario and Pathways

Scenario for Risk Register

  • show / hide
  • Pest is introduced

Pathway Assessed for Entry to UK

  • show / hide
  • Plants for planting (except seeds bulbs and tubers)

Common Pathways

  • show / hide
  • Plants for planting (except seeds bulbs and tubers)

Risk Ratings and Current Mitigations

Unmitigated Risks

Likelihood [1 - 5] 3
Spread [1 - 5] 3
Impact [1 - 5] 3
Value at Risk [1 - 5] 3
Likelihood x Impact [1 - 25] 9
UK Relative Risk Rating [1 - 125] 27

Current Mitigations

  • show / hide

Key mitigation for pest

Regulated quarantine pest



Industry Scheme

Contingency Plan



Mitigated Risks

Likelihood [1 - 5] 2
Spread [1 - 5] 3
Impact [1 - 5] 3
Value at Risk [1 - 5] 3
Likelihood x Impact [1 - 25] 6
UK Relative Risk Rating [1 - 125] 18

Proposed Actions

Proposed Actions



Management By Industry

Targeted Survey


Contingency Plan



Distribution and Pest Details


Country / Territory Status Notes
Russia Present (Limited)
United Kingdom Absent
North America
Canada Present
United States Present
China Present

Type of Pest

  • Fungus

Host or Industry at Risk

  • show / hide


Major Hosts

  • Ulmus L.
  • Ulmus alata Michx.
  • Ulmus americana L.
  • Ulmus crassifolia Nutt.
  • Ulmus glabra Huds. em. Moss
  • Ulmus x hollandica Miller
  • Ulmus japonica (Rehd.) Sarg.
  • Ulmus laciniata (Trautv.) Mayr
  • Ulmus laevis Pall.
  • Ulmus minor Mill. em. Richens
  • Ulmus parvifolia Jacq.
  • Ulmus procera Salisb.
  • Ulmus pumila L.
  • Ulmus rubra Muehlenb.
  • Ulmus serotina Sarg.
  • Ulmus thomasii Sarg.
  • Zelkova serrata (Thunb. Ex Murr.) Makino

Threats to Protected Cultivation

Forest Tree Pests and Pathogens

  • Coniferous

Further Information

PRA Availability

UK (2013), EPPO (2002)

Regulation and EPPO listing

  • show / hide

Regulated quarantine pest. EPPO A1

Actions Indicated

  • show / hide


Statutory action against findings. Priority for additional regulation on imported plants to help further mitigate against introduction, as recommended in the UK PRA.

General Comments

Unlikely to kill elms but may defoliate. Could exacerbate damage already caused by Dutch Elm Disease (DED) and pose threat to small populations free from DED and resistant varieties. Additional requirements on plants for planting could help further mitigate against risk of introduction.

Risk Records for this Pest