Euura atra - amerinae group
See Liston et al (2017) for determination of adults. The host plants are widespread species.
Euura atra larvae feed on leaves of white and crack willow and hybrids of the two. This species tunnels along a shoot not usually causing galls though the shoot may be weakly thickened.
Size: Female: 3.5 - 5.3mm, male: approx. 2.9 - 4.9mm
Distribution: England, Scotland, Wales, Ireland
Flight period: Univoltine
Plant associations: Salix alba, Salix fragilis and rarely Salix viminalis (white and crack willow, hybrids of the two and rarely on 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