ISHS Acta Horticulturae 596: VIII International Symposium on Pear
NEW PEAR ROOTSTOCKS FROM GEISENHEIM, GERMANY |
| Author: | H.B. Jacob |
| Keywords: | Pyrus communis, pear rootstock, seedling, dwarf, semidwarf |
| Abstract:
Quinces (Cydonia oblonga) are still used as the main pear rootstock in Europe, however their diffusion has led to several problems including incompatibility with some scion varieties, development of iron chlorosis and low hardiness to winter cold. Rootstocks belonging to Pyrus communis may overcome such problems. A breeding program obtaining P. communis rootstocks suitable for modern pear production has been in progress since 1980 at the Geisenheim Research Institute, Department of Pomology, Germany. Out of more than 800 seedlings obtained from crossings of ‘Old Home’ x ‘Bonne Louise d´Avranches’, about 10 clones with low to medium vigour have been selected as interesting. One dwarfing clone released under the name Pyrodwarf induces low vigour, high precocity and yield efficiency, uniform fruit size, good graft compatibility with all varieties, good anchorage and winter cold hardiness, no sucker development and no lime-induced chlorosis on high pH soils. The variety name will be Pyrodwarf, the patent name ‘Rhenus 1’, respectively. A second clone with the name ‘BU 2/33’, (the patent name is ‘Rhenus 3’), induces semidwarf to vigorous growth in scions, also shows very good yield properties and is recommended for combinations with very dwarfing scion varieties. | |
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