Monochamus spp. (Cerambycidae)
Family characteristics of antennae, eyes and tarsi + generic
characteristics of elongate cylindroidal form, prothorax with small conical
projections from side, antennae very long, second segment very small.
Elongate slightly tapered grub with thoracic plate above
but none below, elliptical in cross-section, legs absent.
Grubholes elliptical, frass-filled, adult exit holes circular.
Initial stage of attack shows as irregular channelling of wood surface. Larvae
may tunnel more than one year before pupation.
Species of Pinus, Picea, Abies and Douglas-fir.
Larval boring causes extensive damage to dying, recently dead and felled
Monochamus spp. are also the vectors for Bursaphelenchus xylophilus, the Pinewood Nematode. This nematode pathogen feeds on blue stain fungi innoculated into a weakened tree, but can also kill susceptible healthy pine trees by clogging vascular bundles, causing a condition called pine wilt
In China and Japan, pine wilt disease, vectored by M. alternatus, is a serious threat to forestry.
References and Links:
EAG: 532; FC: 309-311.
Additional Images of other Monochamus spp.: