Mt. Tam SOD (IMAGE) University of California - Berkeley Caption These tanoaks were killed by the Sudden Oak Death pathogen on Mt. Tamalpais in Marin County, near one of the sites where the exotic pathogen was first introduced in California. Infected ornamental plants were found to be the most likely source of the introduction. Credit Photo courtesy of Matteo Garbelotto 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.