Understanding Galls on Oak Trees
Galls are small bumps or swellings that can appear on oak leaves or twigs. Galls are caused by tiny insects and are harmless to the tree’s overall health.
Understanding Galls on Oak Trees
Galls are small, round growths commonly found on oak trees, caused by tiny insects laying their eggs in the tree’s tissues. These oak tree galls serve as both food and shelter for developing larvae. While they may appear unusual, galls do not typically harm the tree. In fact, they offer ecological benefits by supporting insect populations and providing food for birds and other wildlife. Galls are a natural and important part of a healthy, biodiverse ecosystem.
Quick Facts about Galls
- Galls are small bumps or swellings that can appear on oak leaves or twigs. Galls can cause leaf curling, folding, or distortion.
They’re especially common on bur oak, swamp white oak, and shingle oak.
Galls are caused by tiny insects and are harmless to the tree’s overall health.
The affected leaves will drop in autumn, and the tree will continue to thrive.
No treatment is needed.
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