Welcome to USAblight

late blight lesion on potato

Potato late blight lesion.  Image courtesy of Jean Ristaino, NC State University.

Welcome to USA blight, a national website that acts 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.

Late blight of potato and tomato caused by Phytophthora infestans is a devastating disease worldwide and led to the Irish potato famine in 1845. Under favorable weather conditions, tomato and potato crops can be destroyed within days. Yield losses caused by late blight and the cost of control measures have been estimated to exceed 6.7 billion dollars annually and the disease is a major threat to food security worldwide.   

Biennial Euroblight Meeting

The biennial meeting of the European network Euroblight, which tracks European outbreaks of late blight, was held this May in Romania.  The meeting included colleagues from North America, South America, and Asia, as well as Europe, and represents a step towards developing a global strategy for tracking and managing late blight.  Read more.

North American Late Blight Symposium


On August 8 and 9, 2014 (Friday and Saturday) a "North American Late Blight Symposium" was held in Minneapolis, Minnesota, U.S.A., that focused on late blight diseases of potato and tomato. The symposium was 1.5 days (all day Friday and Saturday until noon) and took place in the Minneapolis Convention Center immediately before the joint meeting of the American and Canadian Phytopathological Societies, which was being held in the same location. 

The meeting  opened with a keynote address by Geert Kessel of Wageningen University entitled "Towards an IPM 2.0 approach for potato late blight management ". 

There were also shorter talks and a poster session, covering the following topics:

• Epidemiology • Pathogen Biology and Diversity • Plant-based resistance • Integrated Disease Management • Chemical Control

Abstract from the symposium are posted here


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