ISHS Acta Horticulturae 146: International Workshop on Controlling Vigor in Fruit Trees
RELATED GENERA AND PYRUS SPECIES FOR PEAR ROOTSTOCK TO CONTROL SIZE AND YIELD |
| Authors: | Porter B. Lombard, Robert L. Stebbins, Melvin N. Westwood |
| Abstract:
Cydonia used for growth controlling rootstocks lacks certain favorable traits such as good compatibility and anchorage and tolerance to fireblight, winter damage, and calcareous soils. Extensive rootstock research in Oregon during the past 25 years, has identified several related genera and Pyrus species that offer significant size control for pears. The most dwarfing are: Amelanchier, Crataegus, and Sorbus species and P. fauriei. Semi-dwarfing rootstocks are: Cydonia clones, P. cordata and P. syriaca, while the semi-standard stock is: P. dimorphophylla. Selected seedlings and clones of P. nivalis, P. canescens, P. communis clone OH x F 51 and P. calleryana (OPR clones) show considerable promise as dwarfing rootstocks. Highest yield efficiency was found in: Amelanchier, Cydonia, P. dimorphophylla. Clonal selections have been made of several more promising seedlings for further testing to improve uniform tree size and increase productivity. | |
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