Maple Leaf Galls: Harmless, No Treatment Needed

What They Are

Hollow "egg" bumps on leaves = galls induced by mites or wasps. Empty because inhabitants have emerged.

Cosmetic only. Tree vigor unaffected. Populations vary yearly.

None. Sprays ineffective once galls form. Enjoy the curiosity.

Trees: Japanese Maple Honeydew and Sooty Mold: Aphid or Scale Infestation; Maple Cottony Scale Infestation: Large Tree Management Strategy; Maple Leaf Galls: Harmless Insect Structures, No Human Risk; Maple Leaf Scorch from Excess Rain: No Spray Needed This Late; Black Spot Fungus on Mature Maple: Why Fall Cleanup Beats Spring Spraying; Late-Season Leaf Spots on Mature Maple: Cosmetic, Not Critical; Maple Spindle Galls: Cosmetic Only, No Treatment Needed; Maple Bladder Galls: Cosmetic Mite Damage; Red Bell-Shaped Bumps on Oak Leaves: Gall Wasps, Not a Threat; Maple Leaf Spots in the Catskills: Harmless Cosmetic Issue

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