By Snape
United Kingdom 
I have a jostaberry in its second year. Some leaves have a brown powdery in appearance thread like discoloration (not powder as it does not rub off) and a lesser number have lumps
21 Jun, 2010
Answers
Many thanks for your help. Soil pretty good and has been fed.
22 Jun, 2010
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the jostaberry is supposed to be resistant to most of the common blackcurrant diseases but this sounds a little as if it could be blackcurrant leaf spot or a gall mite. As the Josta berry is so vigorous I'd be surprised if it can't overcome whatever is affected it. If it's just a few leaves, I'd remove them and burn them to dispose of whatever pest is there. Is the plant well fed and on good soil?
21 Jun, 2010