Euura pedunculi (Hartig, 1837)

Euura pedunculi - viminalis group (formerly Pontania pedunculi)

See Liston et al (2017) for determination of adults. The host plant is widespread.

Euura pedunculi larvae feed on eared willow, goat willow and its hybrid with tea-leaved willow. The final instar larva emerges from the gall to overwinter externally. The larva is uniformly brown and has minute pseudocerci on the supraanal plate so close together as to appear as one. The gall is usually in contact with the midrib, projecting only below the leaf-blade. The pea-shaped gall is variably hairy, often warty and green often flushed with red.

Size: Female: 2.5 - 4.3mm, male: 2.8 - 3.7mm

Status: Common

Distribution: England, Scotland, Ireland

Flight period: Univoltine, possibly bivoltine in Southern England

Plant associations: Salix aurita, Salix caprea and Salix caprea x phylicifolia (eared willow, goat willow and its hybrid with tea-leaved 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

Vikberg, V. & Zinovjev, A. 2006: On the taxonomy and the host plants of North European species of Eupontania (Hymenoptera: Tenthredinidae: Nematinae). - Beiträge zur Entomologie, Keltern 56 (2): 239-268