Many of the smaller branches on my young live oak tree are covered with small woody balls the size of marbles. Is the tree dying?

Gardens & Landscapes January 08, 2008 Print Friendly and PDF
Woody oak twig galls that form marble-sized, dark brown, woody balls on small twigs are caused by a tiny gall-producing cynipid wasp. The wasp's egg laying and subsequent larval development result in gall formation. These galls do little damage in most cases and no control is required. Control is justified if infestation is heavy and on young trees. Insect populations vary from year to year. Heavy infestations of woody oak twig gall can be prevented by spraying the tree just as buds swell before new growth emerges in early spring. Timing is critical. Contact your local Extension office for insecticide recommendations.

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This work is supported by the USDA National Institute of Food and Agriculture, New Technologies for Ag Extension project.