Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous Trees > Poplar > Clumps of stems/sprouts on trunk or branches
Poplar > Branches > Clumps of stems/sprouts on trunk/branches
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Cryptodiaporthe canker
Cryptodiaporthe populea
- Multiple thin weak adventitious shoots develop
- Bark on cankers may or may not be discolored, but the tissue beneath the bark will be brown to black
- Callus tissue formed around edges of cankers causing bark to fall off and expose the wood beneath it
- Leaves on infected branches turn yellow and drop prematurely
- Random dead branches caused from girdling cankers seen throughout canopy
- Common on Lombardy poplars
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Poplar and willow borer
Cryptorhynchus lapathe
- Random sucker growth along deformed
- Trunks become crooked and misshapened with openings in bark
- Frass pushed out of openings in wood; sap seeps from openings
- Damage most common on young trees and willow species; quaking aspen are not affected
- Larvae are C-shaped, cream-colored and approx. ¼ inch long
- More information on Poplar and willow borer
