Pemphigus gairi Stroyan, 1964
poplar pouch-gall aphid
on Populus
Populus x canadensis, Zwolle, 8.vii.2019 © Arnold Grosscurt; identification provisional
same leaf, underside
Populus nigra italica, Goudswaard, 15.x.2014 © Ben van As
detail
the slit-like opening at the underside
gall
epiphyllous, generally yellowish-green, fusiform swelling of the median part of the midrib, nowhere thicker than four times the normal thickness; slit-like opening at the underside.
primary hostplants
Salicaceae, monophagous
Populus nigra & var. italica.
on Aethusa
gall
the wingless aphids here are 1-2 mm long, pinkish ochreous or pale straw-coloured.
secondary hostplants
Apiaceae, monophagous
Aethusa cynapium.
references
Bellmann (2012a), Blackman & Eastop (2014), Dauphin & Aniotsbehere (1997a), Heie (1980a), Influential Points (2018), Osiadacz & Halaj (2014a), Redfern & Shirley (2011a).
mod 12.viii.2019