Abstract
Abstract Decline- and fire blight-resistant clonal rootstock selections of Old Home × Farmingdale (OH×F), Pyrus communis L. were compared during a 12-year period with Bartlett seedling, P. calleryana Decne. seedling and clonal Old Home as understocks for ‘Bartlett’. Some OH×F clones were found to be more vigorous than Old Home rootstock, while others were much less vigorous. Only OH×F 51 was as dwarfing as East Mailing (EM) Quince A. Trees on some clones of each vigor class were more efficient (yield per unit of tree size) than others of the same class. Yield efficiency was not well correlated with rootstock vigor, but the semi-dwarf clones tended to induce more efficient yield than vigorous ones.
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