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You are here: Home / Microbes / Species Profiles / Late Blight
Species Profiles

Late Blight

Late blight symptoms on Tomato - Invasive.org

Scientific name: Phytophthora infestans (Montagne) Bary (ITIS)

Synonym: Peronospora infestans Montagne (ITIS)

Common names: Late blight, late blight disease, potato late blight, tomato late blight

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  • USAblight - A National Project on Tomato & Potato Late Blight in the United States
    USDA. National Institute of Food and Agriculture.
    A national cooperative effort (funded by USDA-NIFA) on Late Blight of Tomato and Potato in the U.S. This site serves as an information portal on late blight. You can report disease occurrences, submit a sample online, observe disease occurrence maps, and sign up for text disease alerts. There are also useful links to a decision support system, and information about identification and management of the disease.

Selected Resources

Native To: Possibly Mexico (Fry and Goodwin 1997)

Date of U.S. Introduction: First appeared in the U.S. in the 1840s; new aggressive strains of the disease were discovered in the 1990s (Fry and Goodwin 1997)

Means of Introduction: Possibly introduced through infected tomatoes imported from Mexico (Fry and Goodwin 1997)

Impact: Disease of potatoes and tomatoes (Fry and Goodwin 1997)

Current U.S. Distribution: Occurs throughout the U.S.



Selected Resources:

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New York Invasive Species Information - Late Blight
New York Invasive Species Clearinghouse.

Invasive Species Compendium - Phytophthora infestans
CAB International.

Plantwise Technical Factsheet - Phytophthora Blight (Phytophthora infestans)
CABI. Plantwise Knowledge Bank.

International Government

Late Blight of Potato and Tomato (Mar 2016; PDF | 292 KB)
British Columbia Ministry of Agriculture (Canada).
See also Field Vegetables for more fact sheets.

Integrated Management of Late Blight in Potatoes
Manitoba Agriculture, Food and Rural Development (Canada).

State Government

Late Blight of Tomato and Potato in Connecticut (Jun 2014; PDF | 812 KB)
Connecticut Agricultural Experiment Station. Plant Disease Information Office.
See also: Publications - All CAES Factsheets for more resources


Late Blight in Alaska (Dec 2013; PDF | 828 KB)
University of Alaska - Fairbanks. Cooperative Extension Service.
See also: UAF/CES Publications for more fact sheets.

UC Pest Management Guidelines - Potato Late Blight (May 2008)
University of California. Statewide Integrated Pest Management Program.

Pest Alerts for Vegetables - Late Blight Information
Cornell University. New York State Integrated Pest Management Program.

Crop Knowledge Master - Phytophthora infestans
University of Hawaii. Tropical Agriculture and Human Resources. Integrated Pest Management Program.

Late Blight of Tomato (Phytophthora infestans) (Aug 2008; PDF | 593 KB)
University of Hawaii. Cooperative Extension Service.
See also: Plant Disease Publications for more fact sheets.

Fact Sheets: Diseases - Late Blight and Tomato Transplant Production
University of Massachusetts - Amherst. UMass Extension. Greenhouse Crops & Floriculture Program.

Late Blight in Potato (May 2017)
North Dakota State University. Extension Service; University of Minnesota Extension.

Pacific Northwest Plant Disease Management Handbook - Potato (Solanum tuberosum) - Late Blight
Oregon State University. Extension Service.

Plant Pathology Fact Sheet Series: Tomato-Potato Late Blight in the Home Garden (2009)
Pennsylvania State University. Cooperative Extension.

Vegetable Diseases: Late Blight of Tomato and Potato (Feb 2010)
Purdue University (Indiana). Extension.

Late Blight of Tomato and Potato (2012)
Virginia Tech; Virginia State University. Virginia Cooperative Extension.


Plant Disease Lessons - Late Blight of Potato and Tomato
American Phytopathological Society.

Organic Alternatives for Late Blight Control in Potatoes (Mar 2004)
National Center for Appropriate Technology. National Sustainable Agriculture Information Service.

Global Initiative on Late Blight
Consultative Group on International Agricultural Research.

Combating Light Blight
International Potato Center.


Fry, W.E. and S.B. Goodwin. 1997. Re-emergence of potato and tomato late blight in the United States. Plant Disease 81(12):1349-1357.

Integrated Taxonomic Information System. Phytophthora infestans. [Accessed Sep 10, 2014].

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Last Modified: Sep 29, 2018
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