Northern Prairie Wildlife Research Center
Pale green with longitudinal stripes and often red lateral patch on seventh and eighth abdominal segments. Head reddish brown. Second thoracic segment with black, spinulose horns. Black spines along sides of body below spiracles. Gregarious through third instar. Occasionally a pest. Food: maples, but also oaks and other plants growing with maples. Caterpillar: March to November; up to 3 generations in South: 1 generation in North.