Skip to Main navigation 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 > Hackberry > Discolored areas on branches/trunk

Print Icon Email Icon Share Icon

Hackberry > Branches/Trunk > Discolored areas on branches/trunk

1 of 4
  • Image: Wetwood or bacterial slime flux 1
  • Image: Wetwood or bacterial slime flux 2

Wetwood or bacterial slime flux
Several species of bacteria

  • Streaks or columns of water-soaked discoloration of bark on
    the trunk or branches that is gray to yellow-brown when dry
    and black to brown when wet
  • Discoloration commonly starts at bark cracks, wounds, or
    branch unions
  • Fluid may ooze or bleed out of openings in the bark and may
    have a yeast-like odor
  • More information on Wetwood...
2 of 4
  • Image: Lichens 1
  • Image: Lichens 2
  • Image: Lichens 3

Several species

  • Colorful patches on the bark of trunk and/or branches
  • Can be wrinkled, in scalloped sheets, lace-like pads, bushy tufts, paint-like spots or splashes
  • Forms can be flat against the bark surface or raised in leaf-like lobes, finger-like or hairy projections
  • Colors may be shades of gray, green, blue, yellow, orange, or red
  • More information on Lichens...
3 of 4
  • Image: Coral spot canker 1
  • Image: Coral spot canker 2
  • Image: Coral spot canker 3

Coral spot canker
Nectria cinnabarina

  • Sunken dark brown area on branch that is often cracked or has a ridge at the edge
  • Raised cushion-like bumps on affected branches, may be cream to orange or red, turn black with age
  • Dead branches and twigs, often first observed in early spring when no leaves form
  • Or, wilting soon after leaves emerge in spring
  • Common on trees stressed by drought, recent transplant or
    other factors
  • More information on Coral spot canker...
4 of 4
  • Image: Branch cankers 1
  • Image: Branch cankers 2
  • Image: Branch cankers 3

Branch cankers
Botryosphaeria stevensii or Botryosphaeria spp.

  • Cankers are brown to black sunken areas on branch that may have cracked bark and discolored sapwood
  • Scattered dead branches seen throughout canopy
  • Leaves on random branches wilt, turn yellow then brown during the growing season
  • Infected branches don't leaf out in spring
  • Common on trees stressed by drought, winter injury, wounds, insect feeding or other factors
  • More information on Branch cankers...

Don't see what you're looking for?

  • © Regents of the University of Minnesota. All rights reserved.
  • The University of Minnesota is an equal opportunity educator and employer. Privacy