Posted: 19/05/2016 at 16:31
shouldnt be in ericaceous compost, but you'll know it it's rust, look on the underside and they will have bright orange dust on them.
Looks like they've been a bit cold to me. You can see how only the newer bright green leaves are affected,the dark tough ones are ok, cut the bad ones of and repot in multi purpose, I think they will be ok. Just check undersides for rust first,
even if it is, all is not lost, repot, strip all the leaves off chop back and they should shoot out fine, I have rust some years, still got the same old fuchsias.