Exocentrus (Exocentrus) adspersus Mulsant, 1846

Subfamilia: LAMIINAE  /  Tribus: ACANTHOCININI
Exocentrus adspersus
[Photo © Milan Lovětínský]

Exocentrus adspersus, a common and in Europe widely distributed inhabitant of deciduous forests, is polyphagous in many deciduos trees (Corylus, Castanea, Fagus, Carpinus) but prefers oaks (Quercus spp). Larvae develop under the bark and in the wood mainly branches or trees of smaller diameters (1-7 cm). It attacks the branches of standing trees, uproots and branches lying on the ground cut off after felling. The larvae feed mainly sapwood, pupate in the wood in a pupal cell of irregular shape mostly just below the surface of the wood. Overwintering in the larval stage, life-cycle two years. The exit holes are broadly oval in shape. Adults occur from May to August, peak from the mid-June to mid-July. E. adspersus is predominantly crepustular and nocturnal species attracted by light, during the day adults usually sit on the underside of branches from which they can be easily beaten.

Body length:5 - 8 mm
Life cycle:2 years
Adults in:May - July
Host plant:polyphagous in deciduous trees, but prefers oak (Quercus)
Distribution:Albania, Austria, Belgium, Bosnia and Herzegovina, Bulgaria, Corsica, Croatia, Czechia, France, Germany, Greece, Hungary, Italy, Luxembourg, Moldova, Montenegro, Poland, Romania, Russia, Serbia, Sicily, Slovakia, Slovenia, Spain, Sweden, Switzerland, Ukraine, Turkey

The depicted beetle (ML) was reared from a larva found in a dead oak (Quercus sp.) branch in Křivoklátsko Protected Landscape Area (Central Bohemia, Czechia). The living beetl (DR) was collected in Kusín environs (Michalovce district, Košice Region, Slovakia) on June 24, 2019. Daniel Rydzi

Collected by Miroslav Polcar

Exocentrus adspersus
Exocentrus adspersus
[Photo © Milan Lovětínský]
Exocentrus adspersus
[Photo © Daniel Rydzi]

SubfamiliaLamiinae Latreille, 1825
TribusAcanthocinini Blanchard, 1845
GenusExocentrus Dejean, 1835
SubgenusExocentrus Dejean, 1835
SpeciesExocentrus (Exocentrus) adspersus Mulsant, 1846