Poorly Rose :(

Good evening @GenghistheDog it is possibly Rose powdery mildew a fungus that produces airborne spores from infected stems or buds on roses. After overwintering on your plants, the disease is most likely to flare up if the roots are in dry soil and the leaves are in humid air - conditions that are often found when plants are grown near or against a wall.

Your Rose needs thinning out its lacking air circulation,and water the base frequently

 

Good afternoon @GenghistheDog no worries my friend,one organic method I have used is with a mixture of Baking Powder and vegetable oil (The latter to help the baking powder to 'stick' to the rose leaves.,and please don't forget never water your Roses from above ,always water at the roots so that the leaves are kept reasonably dry ,any other advice you need just ask

Baking Soda works by creating an alkaline environment on the leaf, and fungus (powdery mildew and blight are both fungi) cannot colonize the surface of the leaf since they need a neutral pH (around 7.0) to survive and thrive. This spray of water and Baking soda will change the pH of the leaf from around 7.0 to around 8.0, this change is enough to kill, and prevent all blight spores.

Mix 3 tablespoons baking soda with 1 gallon of water. mix in 1 tablespoon vegetable oil, or cooking oil of your choice. This helps the spray to stick to the leaves. mix in 2 drops of dish soap to help emulsify (mix) everything. Spray on tops and bottoms of leaves till dripping ,Begin with 3 tablespoons, and apply that amount one time each week for 3 weeks. Then switch to 3 1/2 Tablespoons if fungus is still growing, or spreading.

Start spraying in the morning or evening – Spraying in the heat of the day can harm your leaves.



- See more at: http://migardener.com/prevent-kill-blight-powdery-mildew-baking-soda/#sthash.PoTxPLIa.dpuf

 

Good morning @GenghistheDog my friend no worries ,you are always most welcome