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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous > Japanese tree lilac > Holes in trunk

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Japanese tree lilac > Trunk/branches > Holes in trunk

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Lilac borer
Podosesia syringae

  • Wilted young green shoots
  • Dead and/or broken stems above larvae feeding sites
  • Sawdust-like frass accumulates around entrance holes and on ground beneath
  • Larvae are creamy white, about 1" long with light brown head
  • Adults resemble paper wasps
  • More information on Lilac borer

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