Agrilus biguttatus (Fabricius, 1776)
two-spotted oak buprestid, oak jewel beetle
on Quercus, etc.
long, zigzagging gallery under the bark, mostly in horizontal directions. This interrupts the sap stream and may kill the tree. According to Buhr sometimes strong callus formation occurs, resembling galling.
during the last decennia the species has strongly increased in abundance, and plays a significant role in oak dieback. Its presence can be ascertained by the characteristic exit holes in the bark, having the shape of a capital “D”.
Arnáiz Ruiz & Bercedo Páramo (2005b), Bilý (1999a), Buhr (1965a), Evangelista & Cristiano (2013a), Fiala (2017a), Moraal (1997a), Moraal & Hilszczanski (2000a), Murria Beltrán & Murria Beltrán (2005a), Panin, Săvulecu & Ruicănescu (2015a), Sakalian (2003a), Škorpík, Křivan & Kraus (2011a), Verdugo (2005a), Verdugo Páez (2002a).