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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous Trees > Prunus > Part or all of flower is brown

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Prunus > Blossom/Fruit > Part or all of flower is brown

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  • Image: Brown rot 1
  • Image: Brown rot 2
  • Image: Brown rot 3

Brown rot
Monilinia fructicola

  • Sudden browning of blossoms or wilting of leaves
  • Part or all of the ripening fruit develop a soft brown rot, then become shriveled and dusted with powdery tufts of tan to gray spores
  • Rotten fruit may remain attached to the tree or fall to the ground
  • Sunken, darkened areas on twigs from which gums are exuded, also known as gummosis
  • More information on Brown rot
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  • Image: Bacterial spot and canker 1
  • Image: Bacterial spot and canker 2
  • Image: Bacterial spot and canker 3

Bacterial spot and canker
Pseudomonas syringae pv. syringae

  • Blossoms turn brown, especially after frost damage
  • Angular, brown to black leaf spots that eventually drop out leaving holes and giving a ragged appearance on leaves
  • Sunken dark colored elliptical cankers form on branches
  • Sticky gums (gummosis) or sour-smelling liquid are excreted from infected branches
  • More information on Bacterial spot and canker

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