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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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  • Late Blight - USAblight (cooperative effort; funded by USDA-NIFA)
    A national project on Late Blight of Tomatoes and Potato in the U.S. This site will act 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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Invasive Species Compendium - Phytophthora infestans
CAB International.


Late Blight - USAblight
Cooperative effort; funded by USDA-NIFA

Late Blight of Potato and Tomato
British Columbia Ministry of Agriculture (Canada).

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


Late Blight of Tomato and Potato in Connecticut -- 2012 (May 2012; PDF | 819 KB)
Connecticut Agricultural Experiment Station. Department of Plant Pathology and Ecology.

Pest Alert: Late Blight of Tomato and Potato (PDF | 610 KB)
Wisconsin Department of Agriculture, Trade, and Consumer Protection.


Late Blight Disease of Potato and Tomato in Alaska (Apr 2006; PDF | 223 KB)
University of Alaska - Fairbanks. Cooperative Extension Service.

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

Late Blight Information
Cornell University. New York State Integrated Pest Management Program.

Phytophthora infestans - Crop Knowledge Master
University of Hawaii. College of Tropical Agriculture and Human Resources; Hawaii Department of Agriculture.

Late Blight of Tomato (Phytophthora infestans) (Aug 2008; PDF | 593 KB)
University of Hawaii. Cooperative Extension Service.

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

Michigan Potato Diseases: Late Blight Risk Monitoring
Michigan State University.

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

Late Blight: A Plant Disease That Impacts the Community (May 2011; PDF | 180 KB)
North Dakota State University. Agriculture and University 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; PDF | 259 KB)
Purdue University (Indiana). Extension.

Late Blight of Tomato and Potato (2012; PDF | 8.16 MB)
Virginia Tech; Virginia State University. Virginia Cooperative Extension.


Late Blight of Potato and Tomato
American Phytopathological Society.

Organic Alternatives for Late Blight Control in Potatoes (Mar 2004; PDF | 509 KB)
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: May 21, 2016
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