Dasineura fraxini (Bremi, 1847)

Fjellberg, Arne & Fedotova, Zoya, 2024, New records of gall midges (Diptera, Cecidomyiidae) from Norway, Norwegian Journal of Entomology 71, pp. 8-94 : 60

Dasineura fraxini (Bremi, 1847)

Material: VE, Holmestrand: Helland, Snekkestad , 59.452733°N 10.354787°E ± 20m, 23 June 2022, L, leg. HE, coll. NHMO; AK, Asker: Konglungen, Spirebukta , 59.832968°N 10.495180°E ± 5m, 3 June 2022, L, leg. HE, coll. NHMO; 59.833411°N 10.495699°E ± 4m, 11 August 2022, L, leg. HE, coll. NHMO; Baerum: Grimsøya , 59.873088°N 10.588583°E ± 6m, 11 June 2019, L, leg. HE, coll. NHMO; Fornebu, Rolfstangen , 59.890374°N 10.633679°E ± 10m, 18 June 2022, L, leg. HE & TS, coll. NHMO; Oslo: Sørkedalen, Strøm , 59.977053°N 10.623344°E ± 10m, 11 August 2022, L, leg. HE, coll. NHMO; Gressholmen , 59.886052°N 10.724000°E ± 3m, 1 July 2020, L, leg. HE, coll. NHMO; Bleikøya , 59.889878°N 10.744520°E ± 3m, 3 July 2020, L, leg. HE & TS, coll. NHMO; Lillestrøm: Lillestrøm, Åråsen , 59.966010°N 11.064613°E ± 20m, 29 June 2020, L, leg. TS, BOLD: NHMO- ENT-548053, coll. NHMO.

Biology and notes: The yellow larvae develop in galled leaves of Fraxinus spp. ( Oleaceae ). Our records are all from F. excelsior . Infected leaves are folded upwards over the midrib, forming one or more pod-like galls along the length of the leaf. Also, the leaf stalks can be galled. Each gall contains several larvae, but each larva is more or less confined to a separate chamber. Uni- or bivoltine. Pupation or hibernation in the soil. We suspect that the species is always univoltine in Norway, but larvae seem to mature and leave the galls over a very long period stretching from June to September.

Distribution: Widespread in Europe including Norway, Sweden, Denmark and Finland. Iran and Algeria.