Garden Q&A: Why are my rose leaves turning yellow and falling off?

Whether you're a gardening beginner or expert, Irish Examiner columnist Peter Dowdall has the answer to your questions

If your rose leaves are turning yellow and dropping off at this time of year, it’s most often due to black spot, a common fungal disease that thrives in warm, damp conditions, writes Peter Dowdall. File pictures

Question

Why are the leaves on my roses turning yellow and dropping off?