APPLE ROOTSTOCK INFLUENCE ON YIELD, YIELD EFFICIENCY, AND TRUNK GROWTH AFTER TWENTY-FIVE YEARS

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  • 1 Department of Horticulture and Landscape Architecture, Washington State University, Pullman, WA 99164-6414

The influence of 9 rootstock on growth and production of `Goldspur' (GS) and `Wellspur Delicious' (WS), and of 3 rootstock on growth and production of `Red King Delicious' (RK) and `Golden Delicious' (GD) apple was evaluated. The spur-type `Delicious' (WS) produced more fruit per tree than the non-spur (RK) strain with Mailing (M) 7 and Malling-Merton (MM) 106 but not with M 26. GD produced more fruit per tree than GS on M 7 and M 26 but not MM 106. Yield efficiencies were usually superior with spurred strains. Efficiency of RK was markedly inferior to GD and WS. Comparing cumulative yields among 9 stocks within spurred strains showed that highest yields were with MM 106 roots. Clonal stocks were more efficient than seedling. The least size-controlling stocks (seedling, MM 104, MM 109, and M 25) tended to be less efficient than M 2, M 7, M 26, MM 106, or MM 111, but the trends throughout the experiment were not consistent. Seedling, MM 104 and MM 109 had the largest trees with spurred tops, and M 26 the smallest.

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