Phylloxera glabra (von Heyden, 1837)
Quercus robur, Hungary, Budapest © László Érsek: leaf with ear galls
underside of an ear gall
a moth later (end May)
the leaf clearly becomes mottled
two females with eggs
an aphid with eggs and nymphs
tiny (< 1 mm) orange-yellow aphids on the underside of a leaf. The aphids of the early spring generation cause “ear galls”. Later generations do not cause any galling, but their suction activities create numerous small yellow spots.The females deposit large numbers of shining yellow eggs in a concentric circle.
Fagaceae, narrowly oligophagous
Rarely also other deciduous oaks.
for the difference with Ph. coccinea check there.
Barson & Carter (1972a), Blackman & Eastop (2014), Börner (1957a), Coulianos & Holmåsen (1991a), Hellrigl (2004a), Lambinon & Schneider (2004a), Redfern & Shirley (2011a) , Roskam (2009a).