Abstract
Erannis tiliaria Harr. and Erannis defoliaria Cl. are closely related species (Rindge 1975) that have similar external appearance and flight period. Erannis tiliaria occurs in North America, whereas E. defoliaria is confined to Europe. Erannis defoliaria occasionally damages oak, Quercus spp. L. (Fagaceae), and cheny, Prunus spp. L. (Rosaceae) (Reichart 1993). During its 1975 outbreak, E. tiliaria severely defoliated 200 000 ha of white and yellow birch, Betula alleghaniensis Britt. and Betula papyrifera Marsh. (Betulaceae), respectively (Howse et al. 1995).
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