Oak Galls

By The Old House Web

Oak Galls

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A number of small flies or wasps cause the formation on oak leaves or twigs. Lay eggs on the leaves or twigs. The plant then forms a gall in which the immature insect develops.

The galls that form on leaves are of little consequence to a healthy tree. However, the twig galls are more serious. The gall formation on the twig disrupts twig function and the portion of the twig beyond the gall may die. A tree heavily infested with twig galls may die.

Visuals associated with this text.

Visual title - Visual size Visual title - Visual size
Oak gall - 48K Oak apple gall - 36K
Oak gall - 35K Hedgehog gall on oak - 43K
Oak gall - 42K
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