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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous Trees > Willow > Sap and/or frass from wounds on branches/trunk

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Willow > Trunk/Branches > Sap and/or frass from wounds on branches/trunk

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  • Poplar and willow borer 1
  • Poplar and willow borer 2
  • Poplar and willow borer 3

Poplar and willow borer
Cryptorhynchus lapathi

  • Frass pushed out of openings in wood
  • Sap seeps from openings
  • Trunks become crooked and misshapen
  • Random shoots sprout along deformity
  • Damage most common on willow and poplar (except for quaking aspen), particularly young trees 1"- 4" diameter
  • Larvae are C-shaped, cream-colored and approx. ¼ inch long
  • More information on Poplar and willow borer...

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