Douglass Jacobs examines a chestnut tree (image) Purdue University Caption Purdue researcher Douglass Jacobs examines a 2 year old chestnut tree at an experimental farm near the university. Although researchers have begun producing blight-resistant American chestnuts, Jacobs said that other obstacles remain in reintroducing the tree to its native habitat throughout the Eastern United States. Credit Credit: Nicole Jacobs Usage Restrictions None 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.