Deciduous Tree Disorder: Cankerworms
Author(s) P. J. Pellitteri, D. L. Mahr, D. J. Hall.
Severe, early season defoliation of several hardwood species may be caused by spring or fall cankerworms. Apple, crabapple, and elm are especially susceptible, but ash, cherry, hickory, maple, and oak can also be affected. This fact sheet details the pests' life cycles, the damage they can cause, and effective means of control (2 pages; Revised in 1997).