Abstract
Pergande* has described the life cycle of this species as consisting of seven generations, the first two and the sexual generations living on the witch hazel, and the other four on the black birch (Betula nigra), the latter four generations consisting of three aleurodiforms and one winged migrant. * Pergande, Theo. “The Life History of Two Species of Plant-lice Inhabiting Both the Witch-Hazel and Birch.” U. S. Dept. of Agr., Div. of Entomology, Technical Series No. 9, 1901.
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