Posted: 05/09/2012 at 10:29
Great, I had noticed that a couple of surrounding roses has also started to show the signs. Can I stop this from occuring again?? is it because I live in such a damp climate?
It's the most common rose problem. Nearly impossible to avoid. You can try spraying. Like all sprays against fungal problems it has to be preventive - you have to start before the symptoms appear. It's too late once they turn up. Effectively you're coating the leaves to prevent the fungal spores from getting a grip.
If you feel like spraying, Bordeaux Mixture is about the most common product, though it's going to be banned next year. You'll find other products at any garden centre. Spraying isn't a guarantee against the disease but it helps.
Other than that, it's a matter of dedicated housekeeping. As soon as you see a leaf showing the symptoms, remove it and destroy it. Collect any fallen affected leaves and destroy them too. And be careful of spreading the pathogen via either hands or secateurs.