Black spot on rose leaves often starts as small dark marks that expand and cause yellowing or early leaf drop. Inspecting the pattern and moisture conditions helps guide the next step.
Look at older leaves first
Check lower and interior leaves, then inspect new growth. Note whether spots have fringed edges, yellow halos, or signs of insect feeding.
Review moisture and airflow
Crowded foliage, overhead watering, and leaves that stay wet overnight can increase disease pressure. Improve spacing and water at the soil line.
Remove affected leaves
Use clean pruners for heavily affected leaves and remove fallen debris from the bed. Do not compost diseased material unless the compost system reliably reaches suitable temperatures.
Monitor new growth
Recheck after rain and humid weather. If the problem spreads despite sanitation and improved airflow, seek region-specific rose-care guidance.