After spending some time doing some research it seems that what I have is currant blister aphid. It seems to be more of an aesthetic concern more than anything and the bush will still continue to grow and produce fruit. The pale yellow aphids (see picture below) can be found underneath the blistered areas in late spring-early summer.
I will have a look tonight and kill any aphids I find and maybe remove the affected leaves. I am not sure is a mix of soap and water does anything against aphid but could be something worth trying.
I went outside to have a closer look and found a a bunch of aphids under various leaves. I simply crashed them with my fingers. I did not notice any ants on the bush but did see a lady bug on another flower.
I have this issue too plus the ants !
unfortunetly the ants stop the ladybirds doing their stuff I am hoping the tits will help out
I may have to resort to soapy water if I am to get a good crop this year and next . I am planting a lot more black current as they are so easy to propergate and to spread them round the garden so their leaves can help the soil. too.
Living in Anjou , France,
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