ISHS Acta Horticulturae 732: VIII International Symposium on Canopy, Rootstocks and Environmental Physiology in Orchard Systems
NEW PEAR ROOTSTOCKS FROM DRESDEN-PILLNITZ |
| Author: | M. Fischer |
| Keywords: | pear, rootstocks, breeding, propagation, field tests, fireblight |
| Abstract:
The aims of the German pear rootstock breeding programme are to improve the propagation ability, dwarfness, resistance to biotic and abiotic damages, anchorage, yield and fruit quality of cultivars, and reduce suckers and burr knots. Results were collected from long-term randomised trials and from field tests in farms under different production conditions. Approximately 6,000 seedlings of cross combinations between different wild species and wild species with known pear cultivars were grown. Finally, 7 clones were selected (Pi-BU 1 to 7). The new Pillnitz pear rootstocks are moderate-to-easy to propagate in stoolbeds, are more frost resistant against winter frost than quince rootstocks and the growing capacity is intermediate between quince and seedlings. The rootstocks are easy to propagate by green cuttings and in vitro. Pomological testing with ‘Clapps Favourite’ was done under a minimal pruning regime to evaluate the cropping potential. Compatibility with several cultivars was satisfactory. Promising clones were quickly multiplied using in vitro propagation for test plants. The original propagation material for multiplication at nurseries never was multiplied in vitro and more results are needed. To achieve this, a trial has commenced in Germany in 2002 to test the new pear rootstocks Pi-BU 2 and Pi-BU 3 together with the new rootstocks Pyrodwarf from Germany, S 1 from Poland and Fox 11 from Italy using 3 cultivars at 9 sites. | |
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