Black Spot Disease (Diplocarpon rosae): Fungal Leaf Spots With Fringed Edges

Black Spot: Rose Fungus That Defoliates From Bottom Up

Black spot (Diplocarpon rosae) is a fungal disease moving from lowest leaves upward, causing yellowing, drop, and black spots with rounded, perforated edges. Severe cases merge spots into large black masses. Active at 75–90°F.

Management

Remove infected/fallen leaves. Avoid wetting foliage. Spray fungicide (or diluted neem oil) every 7–10 days during warm season. Isolate affected plants.