Garden Pests and Diseases: Rose with ugly and very strange maculation, 2 by scatola

scatola wrote:
Hi!
For the bad weather I was a few days without doing the daily check-out in the garden and this is the surprise that a rose plant made me today.
I am very worried because I have never seen a spotting of this kind and so extensive. I thought about the worst hypotheses (Anthracnose, Alternaria, Cercospora rosicola ...)

In the affected rose I completely eliminated the most affected branches and the leaves around but in the neighboring rose it seemed to me that the problem started to arise.
I disinfected the shears with alcohol, is it enough or is it the case that I use another product?
I thought to spray the plant and the ground at the foot with Bordeaux, can it be useful?
I hope to be excessively pessimistic!
An opinion?

Thank you!