Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous > Basswood/Linden > Unusual woody growth on trunk
Basswood/Linden > Trunk > Unusual woody growth on trunk
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Burls
- Large round to semi-circular swellings along main trunk or large branches
- Many buds or sprouts may be present on the burl
- Burls continue to grow as the tree grows
- While burls do not kill trees directly they can reduce a tree's health and lifespan
- There is no known cause for burls
- More information on Burls
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Perennial nectria canker
Neonectria galligena
- Red to reddish orange raised cushion like bumps can occasionally be seen on the edge of the canker
- Cankers become crater like cavities with age
- Dead branches and twigs killed by girdling cankers
- Sunken dark brown cankers on main trunk or branches
- More information on Perennial nectria canker
