Black Spots on Rose Leaves — Black Spot Disease
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GardenSays
Best match: Black spot. Manageable if you act.
- Best match
- Black spot
- Severity
- Treatable
- Causes checked
- 1
Based on black spots on the leaves on the lower leaves with moist soil, the closest match is black spot. Confirm it against the actual plant: Black spots with feathery, fringed edges and yellow halos, worst on lower leaves; leaves around the spots turn yellow and drop.
- This is a symptom-pattern match from your written description, not a lab diagnosis. If the plant is collapsing over days (not weeks), treat it as the worst plausible cause until ruled out.
Do this this week
- 1.Confirm it first: Black spots with feathery, fringed edges and yellow halos, worst on lower leaves; leaves around the spots turn yellow and drop.
- 2.There's no cure for already-spotted leaves. Rake up and destroy fallen leaves, prune out infected canes, and water at the base (never overhead). If severe, spray a labeled fungicide every 7-14 days from leaf-out. Choose black-spot-resistant varieties.
- 3.Collapsing fast (days, not weeks)? Photograph it and check with your county extension before treating
Calculated result · 2 verified sources · Checked 2026-07-18 · How we decide
Why
What to do: There's no cure for already-spotted leaves. Rake up and destroy fallen leaves, prune out infected canes, and water at the base (never overhead). If severe, spray a labeled fungicide every 7-14 days from leaf-out. Choose black-spot-resistant varieties.
- A symptom tree ranks causes by how well your conditions match each cause's known pattern — the distinguishing signs are how you confirm it on the actual plant, not a lab result.
- Most leaf problems trace to water, weather, or common leaf-spot fungi; true plant-killers are rarer but worth ruling out first.
When this doesn't apply
- If the plant is collapsing fast (days, not weeks), treat it as the most severe possibility on the list until proven otherwise.
- Multiple symptoms at once usually means the top cause here plus plain stress — fix watering first, then re-check.
How this was calculated
- 1. SymptomSource guidance
Rose: black spots on the leaves — 1 known cause evaluated (extension-sourced)
- 2. Your conditionsCalculated result
Location on plant: lower; soil: moist. Causes whose known pattern matches these conditions rank higher — this narrows the list, it doesn't identify anything.
- 3. 1. Black spotmatch score 1Calculated result
Distinguishing signs: Black spots with feathery, fringed edges and yellow halos, worst on lower leaves; leaves around the spots turn yellow and drop.
Data sources
- University of Maryland Extension — Black Spot Disease of Roses — Black spot (Diplocarpon rosae) shows black spots with feathery, fringed edges and yellow halos, starting on lower leaves; infected leaves yellow and drop. No cure once infected — remove fallen leaves, prune infected canes, improve air circulation, avoid overhead watering; fungicides every 7-14 days from leaf-out prevent spread. (checked 2026-07-18)
- Iowa State University Extension — Rose Black Spot — Sanitation is critical: removing fallen leaves and pruning infected canes dramatically slows spring infection; good air circulation speeds leaf drying and reduces black spot since spores need moisture to germinate. (checked 2026-07-18)
What changes this answer
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