These are large (1- to 2-inch diameter) rounded growths that are filled with a spongy mass. A single wasp larva is located in a hard seed-like cell in the center. Galls are usually found on the petioles or midribs of leaves. They will dry to a brown, paper thin wall. Removing and destroying galls before they dry and wasps emerge from a hole may help to reduce the infestation. While large and spectacular, they cause no measurable harm.
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