> Unusual growths on petioles
Black Walnut > Leaves > Unusual growths on petioles
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Credit: National Arbor Day Foundation
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Leaf petiole gall
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
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Last modified on June 19, 2007