Any one got any ideas what this is on my gooseberry leaves ? It did it last year as well. It doesn't seem to affect the plants (but it must do). some research was done last year but couldn't find what it is. It's not on every leaf, but it dose seem to spread to more and more leaves as the season goes on.
I would like to be able to treat it if I can, but I haven't got a clue with what.