Black Spot on massive climbing rose

[Polyethyl]

I have climbing roses, that have grown very tall. They have got black spot, one of them very badly.
I have tried to spray them, but they are such big plants I clearly didn't spray enough of them.

Is there anything I can do to help them through the rest of this summer. In previous years they flowered repeatedly, but they're not looking like they'll do that this year.
They are only 4 years old!

Black spot is a very tenacious disease and unfortunately once it's got hold, you will need to spray repeatedly to see positive results. Have you got ladders that you can use? If you don't and you can't reach, you might have to prune them back to a height that you can get to. Black spot is fungal and infected leaves will reinfect the plant. All you can do is continue to spray, feed the plants, remove all dropped leaves and dispose of elsewhere and continue to spray at regular intervals.

Unfortunately the spore responsible regularly mutates, so even if you buy a variety said to be resistant, it won't be forever. Spores are airborne so good housekeeping practice (ie tidying up fallen leaves and removing ropy looking shoots) won't keep it at bay, although it is still advisable.

Practically all my roses this year have black spot, and a new one has come out in rose rust, something I haven't had before. So annoying.

Interestingly all my roses now have it and it seems to be immune to spray.
It's a shame because some of them are from my mum's garden and are quite old.

I have a lovely rose in the front garden, deep red, flowers all summer. It has had black spot every year for the last 30 years, sometimes losing all its leaves by the end of the season.