Harmandiola tremulae (Winnertz, 1853)

(Figure 21 C–D)

Material: AK, Oslo: Ljanskollen, 59.839863°N 10.771831°E ± 250m, 9 August 2020, L, leg. HB & ØE, coll. NHMO; 59.838521°N 10.770813°E ± 400m, 30 July 2021, L, leg. HE, coll. NHMO; Romsås, Steinbruvannet, 59.970434°N 10.886088°E ± 20m, 5 September 2021, L, leg. HE, coll. NHMO; Eidsvoll: Dølihagen, 60.284598°N 11.292169°E ± 50m, 22 August 2020, L, leg. HE, coll. NHMO; N of Dølihagan, 60.284606°N 11.292188°E ± 50m, 15 August 2020, 4L, leg. TS, coll. NHMO; NSY, Gildeskål: Sund, Hestvikodden, 67.062185°N 14.089717°E ± 10m, 9 July 2021, L, leg. HE, coll. NHMO.

Biology: The orange-red larvae develop in leaf galls on Populus alba, P. x canescens and P. tremula ( Salicaceae). Our records are all from P. tremula . The gall is up to about 6 mm across, ball shaped, thin walled, and situated on the upper side of the leaf. Univoltine; pupation and hibernation in the soil.

Distribution: Widespread in Europe including Norway, Sweden, Denmark and Finland. Kazakhstan and parts of Russia.