what has happened to my blackcurrant bush.

The leaves are curling up and looking a browny colour.  They are brittle to touch.  The fruit that was not harvested has also shrivelled up on the affected branches.  I cannot post a picture as the file size is too large and I have tried to reduce it but cannot get it small enough.

They are the alottment in soil.  I inherited them  with the plot so no idea of age.  I moved them last year so been in situ for 20 months.  I could not see any pests and I ran my finger along the branches no gunk.  It is quite windy on the lottie but some of the inside leaves are damaged as badly.  The leaves end up looking brown.  I have not watered them for a while.  I did water during April's dry spell.

Tony

Thanks Yorkie will try tomorrow.