Light green to purple, conelike galls, from 1/2 to 3 inches long, appear on the ends of side branches. The galls harden, turn brown, and may persist for years. They are very noticeable in late summer. Although a few galls are harmless, heavy infestations may stunt branches or kill young trees.
Where practical, remove green galls before they open in midsummer. If galls are abundant, apply an insecticide labeled for this pest, following label directions. Avoid excess fertilization.
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