Agrilus biguttatus (Fabricius, 1776)
two-spotted oak buprestid, oak jewel beetle
on Quercus, etc.
gall
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.
hostplants
Fagaceae, oligophagous
Castanea sativa; Fagus sylvatica; Quercus cerris, faginea, frainetto, macrocarpa, petraea, pubescens, pyrenaica, robur.
notes
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”.
references
Buhr (1965a), Evangelista & Cristiano (2013a), Fiala (2017a). Moraal (1997a), Moraal & Hilszczanski (2000a), Panin, Săvulecu & Ruicănescu (2015a), Verdugo Páez (2002a).