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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous > Serviceberry > Dense clusters of twigs

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Serviceberry > Trunk/branches > Dense clusters of twigs

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Black witches' broom
Apiosporina collinsii

  • Witches' brooms, clusters of numerous weak shoots arising from one point on a branch, occur randomly throughout the tree
  • Dark, olive colored spots of fungal fruiting bodies on underside of leaves
  • Leaves within witches' brooms are first yellow and stunted, turn black
  • Common in wooded, shaded and moist areas

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