Abstract
The influence of nine rootstocks on growth and production of cultivars ‘Goldspur’ (GS) and ‘Wellspur Delicious’ (WS) and of three rootstocks on growth and production of cultivars ‘Red King Delicious’ (RK) and ‘Golden Delicious’ (GD) apple was evaluated. With spurred scions (WS and GS), the largest trees were on seedling (sdlg), Malling Merton (MM) 104 and MM 109 roots, and the smallest were on Malling (M) 26. Annual yields of most combinations had reached a plateau but none showed significant signs of decline after 25 years. WS cumulative yields were not significantly greater than RK (non-spur). GD produced greater cumulative yields than GS. When cumulative yields among nine stocks within spurred scions were compared, GS/MM 106 and MM 104 and WS/MM 109 and MM 106 ranked highest. Yield efficiencies were superior with M 26, spurred growth habit and clonal stocks.
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