Bacterial Gall on Crape Myrtle: Monitor, Don't Cut

What It Is

A round, warty swelling 8–10 inches wide on the trunk is likely crown gall (Agrobacterium tumefaciens) or a bacterial gall. The bacterium enters through wounds and triggers uncontrolled cell growth.

Management

• Do not cut it off. Cutting spreads bacteria and often stimulates larger regrowth.
• Fertilize and water to maximize growth rate; a vigorous tree can outgrow the gall's constriction.
• Monitor for girdling. If the gall encircles >50% of the trunk, structural risk increases. Consult an arborist.

Prevention

Avoid trunk injuries (mowers, string trimmers). Mulch to keep equipment away.