Maple Leaf Galls: Cynipid Wasp, Cosmetic Only

Pinkish, waxy 1-cm balls on maple leaves (likely oak). Dark spot inside. No matching ID found online.

Identification: Insect Gall

Galls are abnormal plant growths induced by insects (here, a tiny cynipid gall wasp) laying eggs. Each gall houses a single larva. Common on oaks; cosmetic, not harmful to tree health.

Management

• No chemical control needed—natural predators regulate populations.
• Rake and destroy fallen leaves in winter to reduce overwintering.
• Hand-pick if few and feasible.

Leaves in photos resemble oak, not maple.