Trypodendron lineatum (Scolytidae)

the striped ambrosia beetle


About 3.5 mm long with scolytid characteristics. Beetle is shiny black or brown with pale coloured stripes along the pronotum and elytra. Shape of head differs between male and female.


Bore holes made by Trypodendron lineatum, the striped ambrosia beetle. Adults bore into dead trees and winterfelled logs and introduce "ambrosia" fungi upon which they and their larvae feed. Galleries are made in the sapwood and the white coloured frass around the entrance hole indicates this is ambrosia rather than bark beetle attack. Adult T. lineatum overwinter in the duff.

Aspects of life in a log for Trypodendron can be seen in a video clip taken from the film, Tiny Beetles - Expen$ive Ta$te$.

Principal Hosts:

Abies, Picea, Pseudotsuga and Tsuga species.

Economic Importance:

The galleries and associated fungal stain result in degrade of lumber and veneer causing severe economic losses to the forest industry, especially in coastal B.C. This insect is the most damaging ambrosia beetle in the west.

A 1990-92 Ambrosia Beetle Task Force determined that 14% of all logs entering coastal sawmills of MacMillan Bloedel Ltd. had been attacked by ambrosia beetle. On the 5 million m3 checked that year, the total degrade loss was estimated at $11 million. The majority of atacks occured in the forest emphasizing the nedd to minimise the time between felling and transportation to the mill. To illustrate the economic importance of the damage caused by the beetles, watch a video clip from Tiny Beetles - Expen$ive Ta$te$.

References and Links:

EAG: 516-520; FC: 410-412.

See HForest.

Additional Images:

Tell-tale piles of white boring dust indicate ambrosia beetle activity in sapwood Piles of ambrosia beetle frass on a sawlog Rounding up a peeler logs shows ambrosia beetle galleries in a dramatic fashion