Euura vesicator (Bremi-Wolf, 1849)

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

Status: Local

Distribution: England, Scotland, Ireland

Flight period: Univoltine

Plant associations: Salix purpurea (purple willow)

References:

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