Black Spots on Roses: Identifying and Managing Black Spot and Anthracnose

Distinguishing between spray damage and fungal disease can be tricky. If spots have dark centers with yellow halos, it’s likely black spot—a common fungal disease on roses, especially hybrid teas and floribundas during humid periods. Small, reddish spots suggest spot anthracnose, another fungal issue.

Prevention

• Space plants for good air circulation.
• Water at the base only—avoid wetting foliage.
• Choose disease-resistant varieties (check plant tags before buying).

Treatment Once Disease Appears

Apply a commercial rose fungicide every 7–10 days to halt spread. Products are available at most garden centers. Remember: water droplets from rain or irrigation spread spores between plants.

Last Resort

If disease persists, consider removing affected plants, raking up all fallen leaves, and replanting with resistant types. Most shrub and landscape roses show strong resistance to black spot.