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.   

USABlight Webinar on Jan 14th, 2014

Webinar now available to view:

Late Blight of Tomato and Potato: Recent Occurrences and Management Experiences

Presented by members of the USABlight extension team (Meg McGrath, Chris Smart, Beth Gugino, Amanda Gevens, and Pam Roberts) and hosted by eOrganic on January 14th, 2014.  While geared for organic farmers, the webinar contains information relevant for all users.  Click here to view.

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