Maple Leaf Spots: Red Galls vs. Brown Fungal Spots — Both Harmless

Two Spot Types on Autumn Glory Maple — Neither Threatens Tree Health

Your maple shows: (1) small red raised bumps, (2) larger brown flat spots. First are gall wasp galls; second likely fungal leaf spot.

Gall Wasp Galls (Red Bumps)

• Wasp lays eggs, leaf forms protective gall.
• Larvae feed inside, drop to soil in late summer.
• Zero health impact — only aesthetic. No control needed.

Fungal Leaf Spots (Brown Flat Spots)

• Common in wet springs; spores spread by rain/wind.
• May cause early leaf drop, but tree refoliates.
• Fungicide impractical — requires spraying at bud break + after every rain.

Verdict: Don't Worry, Don't Spray

Both are cosmetic. Tree health is unaffected. Rake leaves in fall to reduce inoculum. Enjoy the shade.