UK Risk Register Details for Xanthomonas hydrangeae

Please note: there are high levels of uncertainty associated with the risk scores for this pest.

This record was last updated on 23/05/2022

Scenario and Pathways

Scenario for Risk Register

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  • Pest is introduced

Pathway Assessed for Entry to UK

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  • Plants for planting (except seeds bulbs and tubers)

Common Pathways

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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] 2
Impact [1 - 5] 2
Value at Risk [1 - 5] 2
Likelihood x Impact [1 - 25] 8
UK Relative Risk Rating [1 - 125] 16

Current Mitigations

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Key mitigation for pest

Regulation

Surveillance

Industry Scheme

Contingency Plan

Awareness

Research

Mitigated Risks

Likelihood [1 - 5] 4
Spread [1 - 5] 2
Impact [1 - 5] 2
Value at Risk [1 - 5] 2
Likelihood x Impact [1 - 25] 8
UK Relative Risk Rating [1 - 125] 16

Proposed Actions

Proposed Actions

Regulation

Deregulation

Management By Industry

Targeted Survey

PRA

Contingency Plan

Publicity

Research

Distribution and Pest Details

Distribution

Country / Territory Status Notes
Europe
United Kingdom Absent
Netherlands Present
Belgium Present
Germany Present
Italy Present
North America
United States Present

Type of Pest

  • Bacterium

Host or Industry at Risk

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Hydrangea production and garden centres

Major Hosts

  • Hydrangea arborescens ssp. arborescens L.
  • Hydrangea quercifolia Bartr.

Threats to Protected Cultivation

  • Both protected crops and outdoor production

Forest Tree Pests and Pathogens

  • N/A

Further Information

PRA Availability

PRA not available

Regulation and EPPO listing

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Not currently listed

Actions Indicated

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Action

No statutory action in Great Britain.

General Comments

Bacterial pathogen of Hydrangeae causing leaf spots and stem rots of hosts. Many aspects of the pathogen are uncertain, in particular due to it undergoing recent taxonomic changes. It is unlikely to have severe impacts in the UK due to current industry management measures.

Further Information

Uncertainty

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Key uncertainty for pest

The pathogen has only recently emerged and been named as a separate species. There is therefore very little data on the species specifically and as such much of the information is based on the effects of the closely related species X. hortorum and its pathovars.

Climate

Current distribution

Hosts

Impact

Pathways

Regulation

Taxonomy

UK distribution

Risk Records for this Pest