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Basswood/Linden > Trunk > Unusual woody growth on trunk

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  • Image: Burls 1
    Credit: M. Grabowski, University Of Minnesota
  • Image: Burls 2

    Credit: M. Grabowski, University Of Minnesota

  • Image: Burls 3

    Credit: M. Grabowski, University Of Minnesota

  • - CLICK PHOTOS TO ENLARGE -

green arrowBurls

  • Large round to semi-circular swellings along main trunk or large branches
  • Many buds or sprouts may be present on the burl
  • More information on Burls...
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  • Image: Perennial nectria canker 1
    Credit: H.J. Larsen, Bugwood.org
  • Image: Perennial nectria canker 2

    Credit: A. Kunca, National Forest Centre - Slovakia, Bugwood.org

  • Image: Perennial nectria canker 3

    Credit: R. L. Anderson, USDA Forest Service, Bugwood.org

  • - CLICK PHOTOS TO ENLARGE -

green arrowPerennial 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...

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