Western Corn Rootworm (IMAGE) University of Missouri-Columbia Caption The western corn rootworm was first classified as a corn pest in 1867. Its green relative, the northern corn rootworm, was classified as a corn pest in Illinois and Missouri by the late 1870s Credit Joseph Spencer, Illinois Natural History Survey. 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.