Powerhouse plants (IMAGE) University of Delaware Caption A white-blotched Heterocampa munches on an oak leaf. A new study led by the University of Delaware's Doug Tallamy identifies the most critical plants needed to sustain food webs across the United States. Credit University of Delaware Usage Restrictions Must credit University of Delaware 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.