The life cycle and generic position of Aphis tremulae L., 1761 (Aphidoidea: Pemphiginae), with a description of the viviparous morphs and a discussion of spruce root aphids in the British Isles
1975
Stroyan, H.L.G.
An account is given of the biology of Aphis tremulae L., confirming its heteroecy from Populus tremula L. to roots of Picea abies (L.) Karst. The viviparous morphs from both hosts are described. The identity of British aphids from spruce roots is discussed. Aphis tremulae is placed in the genus Pachypappa Koch, of which Astphum Koch becomes a subjective synonym. A key is given to the viviparous morphs of the known British genera of Pemphiginae.
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