Rabdophaga rosaria (Loew, 1850)

(Figure 48)

Material: AK, Oslo: Ellingsrud, 59.929119°N 10.922717°E ± 50m, 16 March 2019, on Salix myrsinifolia, 2L, leg. HE, coll. NHMO; 59.934042°N 10.912729°E ± 4m, 22 April 2022, on Salix caprea, 2P2F, leg. HE, coll. NHMO; Ellingsrud, Dammen, 59.916141°N 10.916457°E ± 200m, 2 February 2020, on Salix myrsinifolia, 10L1F, leg. HE, coll. NHMO; 59.912015°N 10.914252°E ± 250m, 7 April 2020, on Salix myrsinifolia, LPMF, leg. HE, coll. NHMO; Ellingsrud, Munkebekken, 59.930954°N 10.911424°E ± 10m, 18 March 2021, on Salix myrsinifolia, 3L1P2F, leg. HE, coll. NHMO; Ellingsrud, Solberg, 59.924384°N 10.919133°E ± 10m, 27 March 2021, on Salix myrsinifolia, 1M1F, leg. HE, coll. NHMO; Ellingsrud, Nuggerud, 59.917136°N 10.916639°E ± 300m, 7 August 2022, on Salix myrsinifolia, 15L, leg. HE, coll. NHMO; Lørenskog: Losby, Sagenga, 59.881757°N 10.988064°E ± 100m, 11 April 2021, on Salix myrsinifolia, 2L1P1M2F, leg. HE, coll. NHMO; Mønevann, 59.871258°N 10.990403°E ± 5m, 15 August 2020, on Salix myrsinifolia, 3L, leg. HE, coll. NHMO; OS, Ringebu: Venabygd, Trabelia, 61.617229°N 10.078661°E ± 25m, 11 April 2022, on Salix glauca, 5L1F, leg. HE, coll. NHMO; Venabu, 61.649495°N 10.089998°E ± 150m, 11 April 2022, on Salix lapponum, LPMF, leg. HE, coll. NHMO; Dovre: Tverrfjell gruver, 62.227355°N 9.518426°E ± 25m, 6 August 2020, on Salix lapponum, 2L, leg. TS, coll. NHMO; Vågå: SE of Gamelsaetre, 61.606149°N 8.993648°E ± 200m, 12 September 2020, on Salix glauca, 2L, leg. TS, coll. NHMO; STI, Røros: Røros, Granåsen, 62.600349°N 11.456955°E ± 50m, 28 July 2022, on Salix hastata, 2L, leg. HE, coll. NHMO; on Salix phylicifolia x myrsinifolia, 3L, leg. HE, coll. NHMO; NSI, Saltdal: Saltdalen, Dalmo, 66.873827°N 15.293076°E ± 50m, 16 July 2020, on Salix myrsinifolia, 4L, leg. HE, coll. NHMO; NSY, Gildeskål: Sund, 67.070311°N 14.053941°E ± 18m, 19 July 2020, on Salix caprea, 3L, leg. HE, coll. NHMO; Sund, Sundsfjellet, 67.065849°N 14.060831°E ± 3m, 22 July 2022, on Salix hastata, 10L, leg. HE, coll. NHMO; Breivika, Breivikdalen, 66.997495°N 14.278931°E ± 4m, 22 July 2020, on Salix lanata, 4L, leg. HE, coll. NHMO.

Biology: The orange larvae form rosette galls on the apical shoots on a wide range of Salix spp. ( Salicaceae). The galls are typically a couple of centimeters in diameter and consist of numerous diverging leaves that become gradually smaller and more deformed towards the apex/centre of the gall. The barrel-shaped larva sits in a central chamber enclosed by several narrow, scale-like leaves. Galls containing inquilines often become more compact (ball shaped). Univoltine. The larva hibernates in the gall and pupates there in the spring. The galls are often heavily preyed on by birds during the winter.

Distribution: Widespread Palearctic, including Norway, Sweden, Denmark and Finland.