Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous Trees > Birch > Unusual growth on trunk
Birch > Trunk/Branches > Unusual growth on trunk
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Canker rot
(aka. sterile conk or cinder conk)
Inonotus obliquus
- Rough, cracked black, knob or cone like fungal growths protrudes from trunk, often near an old wound or branch stub
- Internally fungal growth is spongy, colored yellow-brown to
rust-brown - Infected trees often break at the point of the fungal growth
- Mottled white and reddish brown wood decay can be seen within infected trunks
- More information on Canker rot
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Perennial nectria canker
Neonectria galligena
- Sunken target shaped cankers on main trunk or branches
- Cankers do not have bark and raised ridges of wood occur in target-like rings within the canker
- Red to reddish orange raised cushion like bumps can occasionally be seen on the edge of the canker
- Dead branches and twigs killed by girdling cankers
- More information on Perennial nectria canker
