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