Abstract
The field performance of sour cherry and apple tissue-cultured (TC) trees has been investigated in comparison with standard-propagated (SP) trees. In sour cherry, TC trees were compared with trees grafted on mazzard and on the clonal rootstock cultivars ‘Colt’, CAB 6P and CAB 11E. The TC trees were the less productive and had the lowest production efficiency. The canopies of all the trees reached the same size at the end of the fifth season in the field. The CAB 6P clonal rootstock appeared the most interesting for high yield and good fruit size. In apple, the TC trees were the most vigorous and had the same cumulative production (1981–1986) as the trees on MM106 because of high yields from TC trees in 1985 and 1986. A noticeable difference between TC trees and those on MM106 existed in production efficiency and canopy size in favour of the trees on MM106. Only in 1986 the TC trees lost the juvenile character shown in the early years in the field.
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