Sultana occupies a much greater area than other cultivar in Australia and is an obvious choice for the provision of improved plant material in this country.
In experiments in which the yields of single Sultana vines were measured over a number of seasons large and consistent differences in yield were sometimes found between adjacent vines.
It was shown some of these differences were reproduced on vegetative propagation, suggesting commercially valuable results from clonal selection. The practical use of selected clones followed rapidly and stages by which this came about are recorded.
The Australian Sultana Clones: Rapid Adoption of Improved Planting Material
1974, Journal of the Australian Institute of Agricultural Science, vol 40, issue 2, month 6, pages 109-113