A 15-foot Indian hawthorn is likely 'Majestic Beauty', a large cultivar. Prune stubs cleanly, remove fallen leaves, mulch, spray with recommended fungicides (see links), fertilize with Holly-Tone, and hope for the best.

Entomosporium Leaf Spot on Photinia and Indian Hawthorn
Leaf Galls on Unknown Ohio Tree: Harmless Insect Nurseries
Understanding Leaf Galls: Those Strange Bumps on Your Tree's Leaves
Brown Spot on Phalaenopsis Leaf: Bacterial Infection Emergency Response
Georgia Native Leaf Collection: Resources for a School Project
Reviving an Indian Hawthorn That Stops Blooming
Cold-Hardy Indian Hawthorn Varieties for Georgia
Dogwood Leaf Spot in Fall: Pseudocercospora
Peace Lily Leaf Spots: Diagnosing and Correcting Cultural Issues
Maple Tree Fall Color: 'Legacy' Sugar Maple or 'Autumn Blaze'
Cercospora Leaf Spot on Cherrylaurel: Shade and Moisture Issues
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