Gnathotrichus retusus

Gnathotrichus • Scolytidae • Curculionoidea • Coleoptera • Insects (plant pests) • pests-diseases-weeds

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Gnathotrichus retusus (click on image to enlarge it)
Author(s): Simon Hinkley & Ken Walker, Museum Victoria
Source: PaDIL

Gnathotrichus retusus (LeConte, 1868) - (western pinewood stainer)

This ambrosia beetle is found in western parts of North America, where it infests dying trees and cut logs of Picea, Pinus, Pseudotsuga or Alnus. It is regarded as an economically important pest in western North America and a quarantine risk to other regions.

There is typically one generation per year with the adults being the overwintering stage. These emerge from the trunks/logs in spring and disperse. New host trees are initially attacked by male beetles, which release the symbiotic fungus Raffaelea gnathotrichi (≡ Ambrosiella gnathotrichi) and attract other beetles through an aggregation pheromone.

• Other images of Gnathotrichus retusus (PaDIL - click to enlarge)
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  posterior end