I think those are old, senescent leaves not diseased.

My leaves all look like that right now, just old and ready to drop.

Thank you Sheila, Kristine and Moses!

I guess leaf senescence and possibly a weird variant of BS make sense.

I usually prune much earlier, mid-November to December, and most foliage is usually removed by the very strong winter winds and storms. I've been waiting for the big storms, but they haven't come (yet). So the foliage has been hanging on for longer than usual.

This is such an unusual winter! Usually nighttime temps will get down to around 7-9°c in January and February. But this year nighttime temps are still around 13-15°c... I hope the winter is just delayed, and the cool will come. If this is "winter" this year, I am dreading what summer is going to be like!

May I add one more thought. Those old leaves, no disparagement ment as to their condition by using the word, 'old,' they are just old, normal for the time of year, since they have so little sustenance to give may have caused the black spot to grow atypically. Not forming early on in the season on a lush, robust richly green leaf leaf, the black spot consolidated its growth into wretched threads to conserve its resources having such a lean environment of aged, energy poor leaves on which to gain sustenance. Hence, the lengthened thread like growth is all it could muster, instead of a robust, expanding, fuzzy edged, circular growth normally encountered.

Moses

That is absolutely, most defintely Blackspot.

Thank you Moses and Paul!

Really not used to seeing this disease here, so I appreciate your insight!

I removed every single leaf from the rose and made sure to get any fallen ones too. I'll give the canes a spray tomorrow with some sulfur/lime. Hope it won't come back!