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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous Trees > Black Walnut > Unusual growths on petioles

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Black Walnut > Leaves > Unusual growths on petioles

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  • Image: Leaf petiole gall 1
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Leaf petiole gall
Aceria caulis

  • Brightly colored galls of differing shapes form on shoots and leaf petioles
  • Galls change color as season progresses. First green, then pink to crimson and finally a reddish-brown
  • More information on Leaf petiole gall

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