Tree Galls on Chinaberry and Goldenrain: Identification and Low Concern

What Are Galls?

Galls are abnormal plant growths induced by insects (wasps, midges, aphids) or mites. Their chemicals manipulate plant hormones, creating protective structures for developing larvae. The "knots" on your leafless chinaberry and goldenrain trees are almost certainly stem/twig galls.

Gall Maker Lifecycle

• Attack at precise bud break/new leaf stage in spring.
• Leaf galls form first; stem galls develop over 2+ years.
• Adults emerge spring; cycle repeats.

Management Reality

• Insecticides rarely work—larvae protected inside woody galls.
• Timing preventive sprays is nearly impossible—emergence varies.
• Pruning helps only on lightly infested small trees.
• Galls cause minimal harm—some leaf drop, minor growth reduction.

Recommendation

Don't worry. Galls are cosmetic. Tree health is unaffected long-term. Wasp populations crash naturally after 1–2 years. Focus on tree vigor: water during drought, mulch, avoid wounding.

Reference: Penn State Gall Factsheet