Skip to Left navigation Skip to Main content Skip to Footer

University of Minnesota Extension

Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous Trees > Poplar > Clumps of stems/sprouts on trunk or branches

Print Icon Email Icon Share Icon

Poplar > Branches > Clumps of stems/sprouts on trunk/branches

1 of 2
  • Image: Cryptodiaporthe canker 1
  • Image: Cryptodiaporthe canker 2
  • Image: Cryptodiaporthe canker 3

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
2 of 2
  • Image: Poplar and willow borer 1
  • Image: Poplar and willow borer 2
  • Image: Poplar and willow borer 3

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

Don't see what you're looking for?