black spots on rose leaves

Asked May 19, 2019, 3:21 PM EDT

I have a rose I planted 3 years ago. Most of the old branches died last year. The new branches coming out have leaves with many black spots. I want to find out what caused it and how to treat it. Thanks. Weijun

Baltimore County Maryland

1 Response

Your rose has symptoms of a fungal disease called black spot. Some types of roses are more susceptible to this disease than others. There is nothing that will cure the symptoms you already see on the leaves, but you can treat with a registered fungicide to protect new foliage. You would have to use a labeled fungicide spray every 7-14 days as the first leaves emerge in the spring. Read and follow the product label instructions regarding the recommended timing and interval for treatment. Here is additional information about black spot and what you can do to manage it.