Euura weiffenbachiella - amerinae group (formerly Euura weiffenbachii Ermolenko: Kopelke (1996))
See Liston et al (2017) for determination of adults. The host plants are widespread species.
Euura weiffenbachiella larvae feed on shoots of purple willow and its hybrid with osier. This species causes the shoot to be clearly thickened and sometimes on one side causing the shoot to bend. Each shoot contains only one larva.
Size: Female: 4.6 - 5.5mm, male: approx. 3.6 - 6.1mm
Distribution: Scotland, Ireland
Flight period: Univoltine
Plant associations: Salix purpurea and Salix purpurea x viminalis (purple willow and its hybrid with osier)
Benson, R.B., 1952. Handbooks for the Identification of British Insects. Hymenoptera, Symphyta, Vol 6, Section 2(a-c), Royal Entomological Society, London
Liston, A.D., Heibo, E., Prous, M., Vårdal, H., Nyman, T. and Vikberg, V., 2017. North European gall-inducing Euura sawflies (Hymenoptera, Tenthredinidae, Nematinae). Zootaxa, 4302(1), pp.1-115.
Liston A, Knight G, Sheppard D, Broad G, Livermore L (2014) Checklist of British and Irish Hymenoptera - Sawflies, ‘Symphyta’. Biodiversity Data Journal 2: e1168. https://doi.org/10.3897/BDJ.2.e1168