Euura pustulator - viminalis group (formerly Pontania pustulator)
See Liston et al (2017) for determination of adults. The host plant is an upland species.
Euura pustulator larvae feed on tea-leaved willow. The gall is in contact with the midrib, projecting equally above and below the leaf-blade. The gall is glabrous and smooth with a single gall per leaf.
Size: Female: 3.0 - 6.1mm, male: 4.0 - 6.6mm
Distribution: England, Scotland
Flight period: Univoltine
Plant associations: Salix phylicifolia (tea-leaved willow)
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