Pachypappa tremulae (Linnaeus, 1761)
aspen-spruce aphid
on Populus, primary host plant
gall
leaf nests, caused by the curving of alle petioles on a dwarf shoot.
host plants
Salicaceae, (narrowly?) monophagous
Populus tremula.
Blackman & Eastop, and Heie only cite tremula; other authors add alba and x canescens.
on Picea, secondary host plant
gall
Apterae 0.5-3 mm, pale, on thin mycorrhizal root ends. Some populations live permanently on the secondary host plant. Not attended by ants.
hostplants
Pinaceae, monophagous
Picea abies, orientalis, sitchensis.
synonyms
Asiphum, Asiphon, Schizoneura, tremulae.
references
Albrecht (2015a, 2017a), Blackman & Eastop (2014), Börner & Franz (1956a), Buhr (1965), Carter & Danielsson (1993a), Dauphin & Aniotsbehere (1997a), Heie (1980a), Hellrigl (2004a), Houard (1908a), Lampel & Meier (2003a), Masłowski, Ledwoń, Wyglenda ao (2017a), Redfern & Shirley (2011a), Stroyan (1975a), Szelegiewicz (1982a), Tambs-Lyche & Heie (1994a), Weis (1955a).