Spruce Budworm Caterpillar (IMAGE) Entomological Society of America Caption This is a spruce budworm caterpillar (Choristoneura fumiferana), one of many caterpillars that can be successfully reared on the McMorran diet, or a modified version of it. Credit Jerald E. Dewey, USDA Forest Service, Bugwood.org. 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.