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