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Root and stem insects - weevils

  • Cause damage to trees by girdling stems, roots, or branches
  • Identifiable by their long snout, clubbed antennae, chewing mouthpars, and elytra (coleoptera)
  • Causes damage in either the larval or adult life stage

We'll be looking at conifer seedling weevil Warren root collar weevil Poplar and willow boring weevil

Wood borers

Includes buprestidae, carambycidae, and siricidae Reduces wood quality by inflicting damage to various depths of wood cuts off vascular flow

Signs include:

  • eliptical or circular exit holes
  • Frass-coloured based on boring deptj
  • Scored wood
    • Eating phloem before boring deeper
  • Tunnels underneath bark / in sapwood

Buprestidae​

Flat headed wood borers Leave elliptical exit holes Bore into mature trees

Cerambycidae​

  • Round-headed borers
  • Leave circular exit holes due to body shape

Hymenoptera​

Horntails / wood wasps Leave circular exit holes due to body shape Lays eggs underneath the bark of trees Can bring toxic mucous and antagonistic fungi to weaken host tree

  • Bore into mature trees