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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous > Catalpa > Fungi growing on trunk or branches

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Catalpa > Trunk/branches > Fungi growing on trunk or branches

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  • Image: Black Rot 1
  • Image: Black Rot 2
  • Image: Black Rot 3

Sapwood rot
Schizophyllum commune

  • Dead branches within the canopy
  • Yellowing to brown leaves may be present
  • Groups or rows of small (< 2 inches wide) semi-circle shelf fungi along killed branches or on the main trunk, often near cracks or wounds
  • Schizophyllum shelf fungi are white and appear fuzzy on top
  • Wood below fungal shelves is yellowish to white, spongy, crumbly and decayed
  • Bark around fungal shelves dies and often falls off
  • Common on trees stressed by drought, winter injury, wounds, mechanical injury or other factors
  • More information on Sapwood rot...
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  • Image: White Rot 1
  • Image: White Rot 2
  • Image: White Rot 3

Armillaria root rot
Armillaria spp.

  • Infected trees have poor growth, dead branches in the upper canopy, undersized and/or yellow leaves
  • Flat white sheets of fungal growth (mycelial fans) between the bark and sapwood at the base of infected trees
  • Thick black, shoestring-like fungus can sometimes be seen under the bark, around roots and in the soil around the base of the tree
  • Wood is decayed, white, soft and spongy; this may extend from the base of the tree well up into the trunk
  • Trees frequently break or fall over in storms
  • Clusters of honey-colored mushrooms may grow at the base of the tree in fall
  • More information on Armillaria root rot...

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