It's currant blister aphid katvet. See the link below for control options.
https://www.rhs.org.uk/advice/profile?pid=491
I get this on my redcurrants but I just leave things alone as they do no damage. This year I got nearly 30lb fruit from 2 bushes.
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It's currant blister aphid katvet. See the link below for control options.
https://www.rhs.org.uk/advice/profile?pid=491
I get this on my redcurrants but I just leave things alone as they do no damage. This year I got nearly 30lb fruit from 2 bushes.