Sunset Maple Bark Splitting and Leaf Spots: Need Photos for Diagnosis

Reported Symptoms

15-yr-old Sunset Maple (Central Ohio): vertical bark splitting/peeling, mid-July early fall color (red), black irregular flat spots + raised tiny bumps on leaves. No visible insects.

Expert Request

Steve (arborist) requested close-up photos of:

1. Leaf spots (both types together).
2. Bark splitting.
3. Note: May need second submission for second photo.

Potential Issues

• Bark splitting: Frost cracks, sunscald, mechanical injury, or vascular disease (cankers).
• Early fall color: Root stress, girdling roots, vascular blockage.
• Leaf spots: Could be tar spot (Rhytisma—black, flat), bacterial leaf spot (raised bumps), or anthracnose.

Owner Actions While Waiting

• Check trunk base for mower/trimmer damage.
• Ensure mulch ring (3" max, not touching trunk).
• Deep water weekly if dry.
• No fertilizer until diagnosis.

Photos are critical. Bark splitting + early color + two spot types = complex interaction needing visual assessment.