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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous > Japanese tree lilac > Wilted leaves

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Japanese tree lilac > Leaves > Wilted leaves

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Verticillium wilt
Verticillium dahliae

  • Leaves are small and yellowed in chronic infections
  • Leaves wilt, eventually turn brown and die in severe infections
  • Leaf symptoms are often seen on only one or a few random branches in the canopy
  • Dark olive to gray streaks are often visible in the sapwood if the bark is peeled back, appearing as rings or arcs in a cross section
  • Symptoms may develop over a single season, or over several years
  • More information on Verticillium wilt
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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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