Hello folks. I have already looked for an answer on other places but none of them seemed to describe the exact problem my currant is probably having.
Some say it is rust. But when I check the photos on the web, it does not look exactly like that.
I don't remember what variety of black currant I have. I think I got it in one of the discount supermarkets, either Wilko or Pound Stretcher.
Here are some photos from the top and bottom of the leaves.
The bush has plentiful fruits and shoots new leaves.
I have not noticed any insects around it, not even aphids.
What could cause this yellowing from the middle of the leaves and is it harmful to the plant? Can I do something about it?