Japanese tree lilac > Leaves > Wilted leaves
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- 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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- 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...