Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous Trees > Oak > Unusual growths on twigs or branches
Oak > Trunk/Branches > Unusual growths on twigs or branches
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Oak bullet gall
Disholcaspis quercusglobulus
- Round, acorn-like galls attached to branches that are dark brownish at maturity
- Sticky honeydew excreted by galls
- Bur and white oak are preferred hosts
- More information on Oak bullet gall
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Oak apple gall
Amphibolips spp.
- Spherical, smooth growths are dark greenish to brownish and up to 2 inch diameter in size and filled with spongy material
- Found on leaf stem or vein in middle of leaf
- Red and black oak are preferred hosts
- More information on Oak apple gall
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Noxious oak gall
Neuroterus noxiosus
- Tuber-like, irregular or potato-shaped growth that is ¼ to 4 inches long on branches
- Leaves become dwarfed, curled or shriveled
- Associated with swamp white oak
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Phomopsis galls
- Galls are round woody balls, occurring individually or clustered on twigs or branches
- Range in size from 1/4 to 2 inches in diameter
- More information on Phomopsis galls
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Wool sower gall
Callirhytis seminator
- Round spherical gall with fuzzy whitish reddish exterior that browns with age; up to 1 ½ inch diameter
- White oaks are preferred hosts
