Toluca Valley (IMAGE) Oregon State University Caption The Toluca Valley in central Mexico has been found to be the ancestral home of the pathogen that caused the Irish potato famine. Credit (Photo by Niklaus Grunwald, courtesy of Oregon State University) Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.