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Yellow spotted leaves

Jo (Manitoba-Zone 3)
3 months ago
last modified: 3 months ago

My roses just produced their leaves a few weeks ago and I'm already having some issues that I'm hoping someone can help me with. The first is a John Davis rose, I've been noticing yellow leaves inside the bush. The second and third are of my Purple Pavement rose, I had the same problem last year, spotted leaves as well as some that are spotted and yellow. Is this from fungus? Mildew? It's been quite hot and humide lately. How do I treat them? Should I be taking any preventative measures with my roses to prevent disease and pests? I'm new to this so other than watering and a little fertlizer, I'm not sure what to do.







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