Fall Cankerworm (IMAGE) North Carolina State University Caption Research from North Carolina State University shows that a lack of plant diversity is a key contributor to the widespread defoliation caused by fall cankerworms in cities. Credit Steven Frank, North Carolina State University Usage Restrictions Photo credit must be given. 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.