Ergates spiculatus (Cerambycidae)

the timberworm

Adults:

Pinned Ergates spiculatus specimen with elytra spread to show membranous hindwings used for flight.

Family characteristics + generic features of large size, slightly flattened, sides of thorax spiny.

Larvae:

Large grubs with very small thoracic legs and abdomen with ambulatory ampullae above and below. Largest borer in British Columbia (60-70 mm in length).

Damage:

Grubholes made by Ergates spiculatus, packed with frass or with shredded wood.

Large grubholes packed with frass or with shredded wood.

Principal Hosts:

Douglas-fir and ponderosa pine.

Economic Importance:

Larval mines speed deterioration and limit the amount of salvage from large burns.

References and Links:

EAG: 530-532; FC: 288-289.