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UK Risk Register Details for Phytophthora infestans

This record was last updated on 03/08/2020

Common Names

  • Downy mildew: potato
  • Late blight: potato
  • Late blight: tomato

Scenario and Pathways

Scenario for Risk Register

  • show / hide
  • National crop losses if effective 'fungicides' withdrawn

Pathway Assessed for Entry to UK

  • show / hide

Common Pathways

  • show / hide
  • Plants for planting (except seeds bulbs and tubers)
  • Bulbs or tubers
  • Soil/growing medium

Risk Ratings and Current Mitigations

Unmitigated Risks

Likelihood [1 - 5] 4
Spread [1 - 5]
Impact [1 - 5] 5
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

Awareness of need for products by regulators



Industry Scheme

Contingency Plan



Mitigated Risks

Likelihood [1 - 5] 3
Spread [1 - 5]
Impact [1 - 5] 5
Value at Risk [1 - 5] 5
Likelihood x Impact [1 - 25] 15
UK Relative Risk Rating [1 - 125] 75

Proposed Actions

Proposed Actions



Management By Industry

Targeted Survey


Contingency Plan



Distribution and Pest Details


Country / Territory Status Notes
Austria Present
Belarus Present
Belgium Present
Bosnia-Herzegovina Present
Bulgaria Present
Cyprus Present
Czech Republic Present
Denmark Present
Estonia Present
Finland Present
France Present
Germany Present
Greece Present
Hungary Present
Iceland Present
Ireland Present
Italy Present
Kosovo Present
Latvia Present
Lithuania Present
Luxembourg Present
Republic of North Macedonia Present
Malta Present
Moldova Present
Netherlands Present
Norway Present
Poland Present
Portugal Present
Romania Present
Russia Present
Serbia Present
Slovakia Present
Slovenia Present
Spain Present
Sweden Present
Switzerland Present
Turkey Present
Ukraine 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
Ecuador Present
Guyana Present
Paraguay Present
Peru Present
Uruguay Present
Venezuela Present
Australia Present
Fiji Present
New Caledonia Present
New Zealand Present
Papua New Guinea Present
Samoa Present
Algeria Present
Angola Present
Cameroon Present
Egypt Present
Ethiopia Present
Ghana Present
Kenya Present
Madagascar Present
Malawi Present
Mauritius Present
Morocco Present
Nigeria Present
Reunion Present
Rwanda Present
Somalia Present
South Africa Present
Sudan Present
Tanzania Present
Uganda Present
Zambia Present
Lebanon Present
Malaysia Present
Nepal Present
North Korea Present
Pakistan Present
Philippines Present
Russia Present
Saudi Arabia Present
South Korea Present
Sri Lanka Present
Taiwan Present
Thailand Present
Vietnam Present
Bangladesh Present
China Present
Georgia Present
India Present
Indonesia Present
Iran Present
Iraq Present
Israel Present
Japan Present
Jordan Present
Kazakhstan Present
Laos Present
Central America
Antigua and Barbuda Present
Bahamas Present
Barbados Present
Bermuda Present
Costa Rica Present
Cuba Present
Dominica Present
Dominican Republic Present
El Salvador Present
Guadeloupe Present
Guatemala Present
Haiti Present
Honduras Present
Jamaica Present
Martinique Present
Nicaragua Present
Panama Present
Puerto Rico Present
Saint Kitts and Nevis Present
Saint Vincent and the Grenadines Present
Trinidad and Tobago Present

Type of Pest

  • Oomycete

Host or Industry at Risk

  • show / hide

Solanum tuberosum

Major Hosts

  • Solanum lycopersicum L.
  • Solanum tuberosum L.

Threats to Protected Cultivation

Forest Tree Pests and Pathogens

Further Information

PRA Availability

PRA not available

Regulation and EPPO listing

  • show / hide

Not currently listed

Actions Indicated

  • show / hide


Monitor developments on regulation of pesticides and encourage the development of resistant varieties.

General Comments

A serious pest of potatoes currently managed by chemical control and crop production practices in the UK. This entry which considered the removal of the current effective fungicide treatments does not cover the likelihood of introduction of new resistant or more virulent races.

Risk Records for this Pest