Lab 4

ventril declevity: elytra much longer than body

Two bark beatles that attack Fir:

• Pitch pockets (blisters)

Scolytus ventralis - Fir engraver

• Main egg gallery runs across the grain and scores wood deeply
  • Larval mines run parallel to wood grain

Dryocetes confusus - Western Balsam Bark Beetle

Douglas-fir

• Douglas-fir beetle (Dendroctonus pseudotsugae)
  • Serious pest of Douglas-fir in BC.
  • large egg gallery

Two-lined Ambrosia Beetle Trypodendron lineatum

• Long nupital gallery with alternating egg galleries
• Stains wood