Fall Cankerworm, Alsophila pometaria (Harris) and Spring Cankerworm, Paleacrita vernata (Peck)

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Importance. - The fall and spring cankerworms defoliate a variety of hardwood species in the spring. Hosts include the red and white oak groups, maples, elms, hickories, ash, and cherry. Heavy defoliation usually occurs in May and June, and can cause growth loss, mast reduction, and, if coupled with other stresses, may result in mortality. Their greatest impact is often felt in high public use areas where defoliation reduces the aesthetic value, and larvae and their droppings create a nuisance.

USDA Forest Service
1400 Independence Ave., SW
Washington, D.C. 20250-0003

(202) 205-8333