Oak trees exhibit a wide variety of galls on their leaves and stems. Most are caused by a small wasp that lays its eggs on the leaves and stems. Each type of wasp causes its own particularly shaped gall. Chemical control is recommended only on plants that are infested on a yearly basis and if the plant is showing signs of distress or growth is being distorted. Treatment must be done in the early Spring before galls form.
Chemical control is ineffective once the galls have formed.
If you suspect you have galls, bring a sample in to our experts at Bachman's to help you diagnose the problem and determine if any treatment is necessary. Inc. All rights reserved.