University of Florida

Galls

Galls are bumps or other odd-looking growths that occur on the stems, branches and leaves of plants. They form as a reaction to irritation caused by insects, mites and other organisms, usually from the insect laying eggs on the plant. The plant grows over the irritation, causing the growth. Each type of insect causes a uniquely-shaped growth, so experts can tell what it is just by observing the gall. Most of the time they're not harmful.

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