Hello,

I am pretty sure you have powdery or downey mildew on the rose based on the first 2 pictures.  It is understandable with all the humid weather we have had.    They are different forms of mildew but the treatments are similar.

To identify powdery mildew;

• A powdery, white dust on roses that partially or completely coats upper and lower sides of leaves. This coating can easily be wiped off with your fingers unlike spots of lime and sulphur or similar chemical sprays.
• While shoots and buds can also have this white coating, it does not occur on the woody stem of the rose.
• When viewed through a magnifying glass, it is possible to identify small arm-like structures. These are the so-called conidia, which are the spores responsible for spreading the fungus.
• What you cannot see, however, is the fungal mycelium – the network – which grows through the stomata into the leaf and absorbs nutrients from the upper cell layers.
• In case of a severe infection, the leaves turn red and curl up or may even drop.
• As well as plant growth being inhibited, stunted growth of the shoot tips and the formation of deformed leaves can also occur.

To identify downey mildew;

• Brown-red or purple spots of mould visible on upper and lower sides of rose leaves, often between the leaf veins.
• In humid conditions, a thin, grey-white layer of mould forms on the underside of the leaf. With a magnifying glass, you can see the individual spore carriers, each carrying only a single spore with which the fungus spreads.
• Shoots can also become infected, displaying reddish spots and possibly a layer of mould.
• In the case of severe infestation, the plant may drop its leaves.
• Buds can dry out.
• Plant growth is inhibited.

Downy mildew occurs much less frequently than powdery mildew on roses. As the symptoms are very different, it is not easy to mistake downy mildew and powdery mildew for one another. Downy mildew, for instance, never causes the distinctive white coating typical of powdery mildew.

You will want to make sure to prune out the diseased areas and dispose of them, make sure there is good air circulation and do not wet the leaves. The plant should be in a sunny location with 8 hrs of sun.   Keeping the plant as healthy as possible will make sure it survives any injury.  You can also use a fungicide.
Fungicide sprays recommended for use in the home gardens include: propiconazole, thiophanate-methyl, myclobutanil, sulfur, neem oil (clarified hydrophobic extract), or baking soda mixed with horticultural oil.  Apply all chemicals according to directions on the label.

Here is a link from Clemson University that will give you more information on rose diseases.  
https://hgic.clemson.edu/factsheet/rose-diseases/

If you have any other questions just let us know.

Thank you for contacting the EMG Ask Extension.