PERFORMANCE OF 3 APPLE CULTIVARS ON 6 ROOTSTOCKS DURING THE FIRST 6 SEASONS, AT LENSWOOD, SOUTH AUSTRALIA

P. James
In 1990, a trial was established at Lenswood, South Australia, to assess the performance of M.9, Mark, Ottawa 3 (0.3), M.26, MM.106, and MM.111 rootstocks each with 'Royal Gala', 'Braeburn' and 'Red Fuji' (clone Naga Fu 2). This paper reports performance in the first six years of the planting. To date, M.9 rootstock appears to be too dwarfing due to insufficient canopy volume. Mark is performing satisfactorily for all cultivars, and no soil-line swelling has been observed. 'Royal Gala' trees on 0.3 and MM.106 have similar cumulative yields (kg/tree) but the yield efficiency (kg/cm2 TCA) and fruit quality of 0.3 are superior. The fruit maturity of all cultivars is advanced on 0.3 in comparison to the other rootstocks. The susceptibility of 0.3 to stem grooving virus and the presence of this virus in the 'Red Fuji' clone Naga Fu 2 has led to the death of 50% of the 'Red Fuji'/0.3 trees. The remaining trees are weak. MM.106 and MM.111 have produced excessive vegetative growth and tree size, with a corresponding reduction in fruit quality, size and cumulative yield efficiency. Tree growth indicates the need for further experimentation in South Australia using M.26, 0.3, Mark and M.9 at higher planting densities than 1250 trees/ha. 'Royal Gala' and 'Red Fuji' have quickly become established as cultivars of significant economic importance. Despite its excellent flavor and high consumer demand, 'Braeburn' has several problems (excessive vigor, biennial bearing, shoot growth irregularities, sunburn susceptibility, bitter pit) that are affecting its commercial potential. It does not appear to be suitable for South Australia; however, it is performing better in the cooler Australian growing regions.
James, P. (1997). PERFORMANCE OF 3 APPLE CULTIVARS ON 6 ROOTSTOCKS DURING THE FIRST 6 SEASONS, AT LENSWOOD, SOUTH AUSTRALIA. Acta Hortic. 451, 163-170
DOI: 10.17660/ActaHortic.1997.451.16
https://doi.org/10.17660/ActaHortic.1997.451.16
Dwarfing rootstocks, cumulative yields, cumulative yield efficiency, tree volume

Acta Horticulturae