Pachypappella lactea (Tullgren, 1909)
on Populus, primary host plant
gall
the leaf is folded downwards along the midrib and turns bright red or orange. The aphids, thus proteced, at the underside of the leaf. The galled leaf often at the base of a shoot, while the higher, ungalled, leaves turn yellow or red as well.
primary hostplants
Salicaceae, narrowly monophagous
Populus tremula.
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, sitchensis.
references
Albrecht (2015a, 2017a), Blackman & Eastop (2014), Carter & Danielsson (1993a), Danielsson (1974a), Heie (1980a), Redfern & Shirley (2011a).
mod 11.ix.2017