The spring and fall cankerworm are distinct but very similar species belonging to the Lepidoptera order of insects. The fall cankerworm caterpillar is green or green/brown, with a dark stripe along the back and white stripes along its sides. The spring cankerworm is the same size but is darker green or reddish green with a yellowish stripe down each side. It attacks many tree hosts but prefers elm, hackberry, and locust. Cankerworm feeding is first indicated by small holes in the leaves. As the larvae mature, they will consume all but the largest ribs of the leaf. The best evidence of cankerworm infestation is the presence of the cankerworm itself.
Host Trees for Cankerworm
Red and White Oaks, Maples, Elms, Hickories, Ash, and Cherry.