Euura vesicator - viminalis group (formerly Pontania vesicator)
See Liston et al (2017) for determination of adults. The host plant is widespread.
Larvae feed on purple willow. The gall is in contact with the midrib, projecting equally above and below the leaf-blade. The gall is glabrous and smooth with up to 4 galls per leaf.
Size: Female: 3.0 - 6.2mm, male: 3.6 - 5.6mm
Distribution: England, Scotland, Ireland
Flight period: Univoltine
Plant associations: Salix purpurea (purple willow)
The National Biodiversity Network records are shown on the map below. (See terms and conditions)
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