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UK Risk Register Details for Rhizoctonia solani

This record was last updated on 24/01/2023

Common Names

  • Areolate leaf spot
  • Black scurf of potato
  • Black speck of potato
  • Bordered sheath spot of rice
  • Bottom rot of lettuce
  • Collar rot
  • Damping-off of seedlings
  • Foot rot
  • Fruit rot
  • Leaf blight of yam
  • Sharp eye spot of cereals
  • Sore shin of tobacco
  • Stem canker
  • Stem rot of cauliflower
  • Stem rot of potato
  • Tuber soft rot of yam
  • Web blight

Scenario and Pathways

Scenario for Risk Register

  • show / hide

Pathway Assessed for Entry to UK

  • show / hide

Common Pathways

  • show / hide

Risk Ratings and Current Mitigations

Unmitigated Risks

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

Current Mitigations

  • show / hide

Key mitigation for pest



Industry Scheme

Contingency Plan



Mitigated Risks

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

Proposed Actions

Proposed Actions



Management By Industry

Targeted Survey


Contingency Plan



Distribution and Pest Details


Country / Territory Status Notes
Austria Present
Bulgaria Present
Croatia Present
Czech Republic Present
Denmark Present
Finland Present
France Present
Germany Present
Greece Present
Hungary Present
Italy Present
Lithuania Present
Montenegro Present
Netherlands Present
Norway Present
Poland Present
Romania Present
Russia Present
Serbia Present
Slovakia Present
Spain Present
Sweden Present
Switzerland Present
Türkiye Present
United Kingdom Present (Widespread)
North America
Canada Present
Mexico Present
United States Present
South America
Argentina Present
Bolivia Present
Brazil Present
Chile Present
Colombia Present
Guyana Present
Paraguay Present
Peru Present
Suriname Present
Uruguay Present
Venezuela Present
Australia Present
New Zealand Present
Papua New Guinea Present
Samoa Present
South Africa Present
Tanzania Present
Tunisia Present
Uganda Present
Zambia Present
Zimbabwe Present
Burundi Present
Cameroon Present
Congo (Democratic Rep.) Present
Egypt Present
Ethiopia Present
Kenya Present
Madagascar Present
Malawi Present
Mauritius Present
Mozambique Present
Nigeria Present
Rwanda Present
Senegal Present
Sierra Leone Present
Bangladesh Present
China Present
India Present
Indonesia Present
Iran Present
Iraq Present
Israel Present
Japan Present
Laos Present
Lebanon Present
Malaysia Present
Nepal Present
North Korea Present
Oman Present
Pakistan Present
Philippines Present
Singapore Present
South Korea Present
Sri Lanka Present
Syria Present
Taiwan Present
Thailand Present
Vietnam Present
Central America
Barbados Present
Costa Rica Present
Cuba Present
Dominican Republic Present
Guadeloupe Present
Honduras Present
Jamaica Present
Martinique Present
Panama Present
Puerto Rico Present
Saint Kitts and Nevis Present
Trinidad and Tobago Present

Type of Pest

  • Fungus

Host or Industry at Risk

  • show / hide

Major Hosts

  • Solanum tuberosum L.
  • Plants (general)

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 (as Thanatephorus cucumeris)

Actions Indicated

  • show / hide


No current Actions Indicated

General Comments

The Risk Register entry for this pest is extremely incomplete and it cannot be compared with other pests on the Risk Register at the current time. As this is a Regulated Non Quarantine Pest (RNQP) listed in the legislation, we are making available the information we have gathered on the pest so far. It is possible that we will add new information to this pest entry in due course, but as there are a great many RNQPs this may take some time.

Risk Records for this Pest