I have a fruit cage that contains Tayberry Blackberry Goosberry and Black currant
By Liam100
Devon,
United Kingdom 
Three years of sucess then the blackberry and tayberry have failed to flower the leaves are shrunken and yellow. books suggest lack of iron but I spread sulphate, of Iron potash and ammonia plus a general fertiliser every year, and no sign of a pest or insect infestation and only these two plants. see main photos get some idea of my set up.
6 Jun, 2009
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blackberries
gooseberries
Answers
Me again, I have been checking on the soil the Blackberries and Tayberries prefer acid soil, whereas gooseberries any rich moist soil, so I would think as the yellowing of the leaves in the way you discribe is chlorosis, caused through too much lime I would think that is your problem, perhaps when you planted them you put compost in to plant them in which case that would have helped for the first few years but the roots will have worked down to the origional soil by now . As I metioned before, take a deep soil test from down under them. If it is alcoline then feed the necessary ericatious feed. Also for fruit and flower production add potash in the early Spring. Good Luck.
6 Jun, 2009
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Perhaps you would be wise to take a soil sample perhaps it has become unbalanced for what they need.
6 Jun, 2009