ISHS Acta Horticulturae 557: VII International Symposium on Orchard and Plantation Systems
INTERSTEM/ROOTSTOCK COMBINATIONS INFLUENCE STEM AND LEAF CHARACTERISTICS OF SPURS AND EXTENSION SHOOTS OF ‘RUBY JON’ APPLE TREES |
| Authors: | B.H. Taylor, G.H. Moonga, S.K. Kurtural, D. Geisler-Taylor |
| Keywords: | Malus Domestica Borkh, fruit size, yield |
| Abstract:
The influence of interstem and rootstock combinations on leaf area per spur and average leaf size of spurs and diameter of current season spur stem, and the average size of mid-terminal extension shoot leaves of 'Ruby Jon' on 30 different interstem/rootstock combinations or rootstocks alone was evaluated. In the third leaf, the treatments induced either ultradwarf, dwarf, semidwarf or vigorous scions. Treatments induced spur leaf size that ranged from 7% larger to 28% smaller than on the industry standard, 'Ruby Jon’/MM. 111. Total spur leaf area ranged from 25% greater to 20% smaller compared to 'Ruby Jon’/MM.111 and spur stem diameter ranged from 30% greater to 12% smaller. The ultradwarfs tended to produce larger spur stem diameters (e.g. G.65/BUD.118) than the industry standard, while more vigorous treatments (e.g. P.18) had smaller spur stem diameters. Spur leaf size was positively correlated with fruit size on the semidwarf and dwarf trees. There was also a positive correlation between whole spur leaf area and fruit yield in the vigorous and dwarf scions. | |
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