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Scientific Name Hyphantria cunea Common Name Fall Webworm Habitat Shrubby areas in the eastern and southern prairie ecoregion of Alberta. Seasonality June. Identification Hyphantrea cunea is very similar to Spilosoma congrua, which is usually immaculate or nearly immaculate. Spilosoma congrua has a more robust body and the forewing apex is less pointed. Diet Info An extremely polyphagous species, recorded primarily from trees and shrubs. Range Occurs across most of the U.S. and southern Canada, although absent from central and western Alberta and south-eastern B.C.