When Corn Gets Help from Above (IMAGE) Boyce Thompson Institute Caption When caterpillars attack, corn plants give off strongly scented terpene compounds to attract parasitic wasps whose larvae kill the caterpillars. Credit Patricia Waldron Usage Restrictions Use with proper credit to Patricia Waldron 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.