Paleacrita vernata, the Spring Cankerworm & Alsophila pometaria, the Fall Canker Worms
Cankerworm is a term for what are commonly called inchworms, loopers, measuring worms or spanworms – any of the caterpillars that move with a distinct looping motion.
Both fall and spring cankerworms feed on a wide variety of trees including apple, ash, beech, elm, hickory, linden, maples and oaks.
See below for control products. For more information please see our Caterpillars and Moths Control page.
Photo courtesy of USDA Forest Service - Northeastern Area Archives, USDA Forest Service, www.forestryimages.org