The willow wood-wasp is one of three species in the genus in Britain. Xiphydria prolongata is the only one of the three species to have a red girdle on the abdomen covering at least tergite four. The abdomen also has lateral white spots.
Larvae bore into the green-barked wood of willow trees and can become a serious pest in the production of cricket bat willows causing reduced vigour, die-back and damaging heartwood. Females inject their eggs below the bark where the bark is fissured and 2 to 3 mm thick. Infection rates can be high with over a hundred adults emerging from a single trunk. Around 75% of emerging adults are male. Males tap the timber with the tip of their abdomen creating a noise that can be audible from several metres away. Males emerge in May and June with females emerging a few weeks later peaking in July.
Size: 6 - 18mm
Distribution: England, Wales
Flight period: June to August
Plant associations: Salix spp. (willows)
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
Burtt Davy, J., Day, W.R., Chrystal, R.N., Bryce, J. 1958. 2nd Edition. Cultivation of the cricket bat willow. Bulletin No. 17. Forestry Commission, London.
Chrystal, R.N., Skinner, E.R. 1932 Studies in the Biology of the Woodwasp Xiphydria prolongata Geoffr, (dromedarius F.) and its parasite Thalessa curvipes Grav., The Scottish Forestry Journal Vol. 46, 1. Douglas and Foulis, Edinburgh.
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
Shaw, M. R. & Liston, A. D. 1985: Xiphydria longicollis (Geoffroy) (Hymenoptera: Xiphydriidae) new to Britain. - Entomologist's Gazette, Faringdon 36: 233-235
Westwood, J. O. 1845: Memoirs on various Species of Hymenopterous Insects. - (The) Transactions of the Entomological Society of London, London Vol. 4(2): 123-141