UK Risk Register Details for Magnaporthe oryzae Triticum pathotype

Pest has been archived

This pest has been assessed for the Risk Register and is considered to pose a low risk to the UK. The information on this pest was correct as of 03/07/2020, but is no longer actively maintained. It will only be updated if new information is received which indicates the potential for a significant increase in risk to the UK.

This record was last updated on 02/10/2020

Common Names

  • Blast of rice
  • Johnson spot
  • Johnson spot: banana
  • Oval leaf spot
  • Oval leaf spot of Gramineae
  • Pitting disease
  • Pitting disease: banana
  • Rice blast disease
  • Rice rotten neck
  • Rice seedling blight
  • Rotten neck of rice
  • Seedling blight of rice

Scenario and Pathways

Scenario for Risk Register

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  • Pest is introduced

Pathway Assessed for Entry to UK

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  • Seeds

Common Pathways

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  • Plants for planting (except seeds bulbs and tubers)
  • Seeds
  • Grain

Risk Ratings and Current Mitigations

Unmitigated Risks

Likelihood [1 - 5] 2
Spread [1 - 5] 3
Impact [1 - 5] 3
Value at Risk [1 - 5] 5
Likelihood x Impact [1 - 25] 6
UK Relative Risk Rating [1 - 125] 30

Current Mitigations

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Key mitigation for pest



Industry Scheme

Contingency Plan



Mitigated Risks

Likelihood [1 - 5] 2
Spread [1 - 5] 3
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
United Kingdom Absent
South America
Argentina Present
Bolivia Present
Brazil Present
Paraguay Present
Zambia Present
Bangladesh Present
India Present

Type of Pest

  • Fungus

Host or Industry at Risk

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Major Hosts

  • Triticum L.
  • Triticum aestivum L.

Threats to Protected Cultivation

Forest Tree Pests and Pathogens

Further Information

PRA Availability

UK (2003)

Regulation and EPPO listing

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Not currently listed

Actions Indicated

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No statutory action against findings

General Comments

Fungal pathotype causing ‘wheat blast’ in South America and Asia, unlikely to pose a significant plant health threat to the UK, as climatic conditions unlikely to be suitable. Monitoring for new races of cereal yellow rust in the UK is carried out by the UK Cereal Pathogen Virulence Survey that provides and early warning facility to industry and growers of disease emerging on crops. It also enables breeders and variety testing authorities to screen out potential new varieties and breeding lines that might be susceptible to new races of disease found to be emerging in the UK.

Further Information


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Key uncertainty for pest

The suitability of the UK climate for outbreaks.


Current distribution






UK distribution