Blackcurrant advice needed

[womble]

My blackcurrant I've just noticed has started looking like it's dying.
It really doesn't look very good, not many leaves, leaves going brown, the fruit also seems to have stopped growing. A couple of weeks ago it was fine, then it just seems to have stopped, you might just be able to see the fruit sprigs, some of the berries are big and lovely, the other ones have just stopped dead.
I've looked at the photos of reversion and it doesn't seem to be that, but I'm not sure.

Do I pull it out now, or do I hang on until the (maybe small) harvest. Or do I treat it with something and hope?

Has anyone seen this before please?

edit, It seems that alot of the leaves have fell off, I just hadn't noticed them.

[Two_Sheds]

I can't see what they are planted in?
How many plants? They look very close together.
My blackcurrants are 3 foot apart each way.

[womble]

They are all in the ground, there is just a load of cardboard down to stop the ground elder which has taken over again. The bush is next to another 2 redcurrant bushes and another blackcurrant (which all seem to be fine) at about a 3 foot distance apart. Looking back, they could have been further apart, but 4 or 5 years ago when they went in, they were just small sticks

[Madasafish]

We have the same problem in one part of the garden. In our case it's honey fungus which kills off older bushes incl buddleia. I just cut out the dead bits, and when the bush dies replace it - lots of compost etc not in the sme place. Worked so far for 20 odd years.

I take fresh cuttings in the autumn - and place elsewhere so we always have a supply of new bushes...

[womble]

Thanks.

I think I've found the problem, every remaining leaf is absolutely covered in aphids, never seen it like that before. Normally I have problems with them on the tips of new shoots and I spray or pinch the tips off, or squash the aphids by hand before the natural predators take over, done that already a week or so ago.
But having a look at the bush I couldn't see one predator. Not one ladybird. Normally it's covered with them.

I know, harlequin springs to mind

I have sprayed with soft soap but it may be too late.