Euura viminalis (Linnaeus, 1758)

Euura viminalis- viminalis group (formerly Pontania viminalis)

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 only below the leaf-blade. The pea shaped gall is glabrous, often very warty and green blushed with red.

 

Size: Female: 2.9 - 5.4mm, male: 2.8 - 4.7mm

Status: Widespread

Distribution: England, Scotland, Wales, Ireland

Flight period: Bivoltine

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