Common name: Cankerworms
Scientific name: Fall Cankerworm (Alsophila pometaria) and Spring Cankerworm (Paleacrita vernata)
Hosts: There are two species of cankerworms, the fall and spring cankerworms. The names refer to the season during which their eggs are laid. The eggs of both species will hatch about the time buds on trees begin to open in spring. As a result, both species occur together in mixed populations and can often be found on the same tree. Both species feed on a wide range of deciduous trees and shrubs and are found across much of the United States and Canada.
Favored host trees are elm (Ulmus) and apple (Malus), but several other species can be attacked. These include oak (Quercus), cherry (Prunus), hickory (Carya), honey locust (Gleditsia), maple (Acer), beech (Fagus), linden (Tilia), birch (Betula), and hawthorn (Crataegus).