Corn Rootworm (IMAGE) University of Bern Caption The western corn rootworm is an important maize pest in the US. It is also invasive in Europe. The larvae of the rootworm use plant defense substances as self-defense against biological control agents such as entomopathogenic nematodes. Credit Cyril Hertz and Lingfei Hu, University of Bern 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.