Chestnut Gall Wasp (IMAGE) University of Extremadura Caption The rapid invasion of the chestnut gall wasp is causing considerable economic and ecological damage in the European chestnut sector. Credit University of Extremadura 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.