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Rose with ugly and very strange maculation

Rome, Italy

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!

Thumbnail by scatola Thumbnail by scatola Thumbnail by scatola
Northern California, CA(Zone 9b)

It looks like Black Spot to me, a common fungal infection of roses.
https://cpb-us-e1.wpmucdn.com/blogs.k-state.edu/dist/9/56/files/2016/05/IMG_4003-1ytk83w.jpg
This article may help.
https://www.rhs.org.uk/advice/profile?PID=270
Good luck.

Rome, Italy

Quote from Kell :
It looks like Black Spot to me, a common fungal infection of roses.
https://cpb-us-e1.wpmucdn.com/blogs.k-state.edu/dist/9/56/files/2016/05/IMG_4003-1ytk83w.jpg
This article may help.
https://www.rhs.org.uk/advice/profile?PID=270
Good luck.

First of all I apologize for the delay in answering!!!!
Thanks a lot, I found very interesting and useful as described in the site indicated.
My roses are better and they also thank you veri much!!!!

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