Irish Potato Blight Originated in South America
The potato blight that killed about a million people in Ireland in the 1840s originated in South America, a new genetic analysis finds.
Until now, the origin of the fungus-like blight that devastated potato crops in Ireland and throughout Europe had not been pinned down. Now researchers at North Carolina State University and the Norwegian University of Science and Technology Museum say the blight was caused by a pathogen with a particular genetic lineage, dubbed FAM-1.
The researchers conducted a new analysis of 183 samples of this pathogen, the oldest dating back as far as 1941. They found that the genetic strain that caused the European blight likely made its way from South America to the United States and then to Europe via potato shipments and the seed trade, they reported Dec. 28 in the journal PLOS ONE. Read more.










