ISHS Acta Horticulturae 800: X International Pear Symposium
DIFFICULT TO PROPAGATE PEAR ROOTSTOCKS: WILL THEY WORK AS INTERSTEMS? |
| Authors: | E.A. Mielke, J. Turner |
| Keywords: | pear, Pyrus communis L., yield, Brossier, South African rootstocks |
| Abstract:
Four difficult to propagate [Brossier (‘P.2274’ and ‘P.2276’) and two South African (‘BP-1’ and ‘BP-2’)] rootstocks were evaluated in a 10-year trial at Hood River, Oregon. While trees with ‘P.2276’ interstems had the largest trunk cross-sectional area (TCSA) and trees with ‘BP-1’ exhibited the largest canopy volume (CV) in the fifth leaf, no interstems significantly affected CV by the tenth leaf, as all trees were exceeding their available space. Interstem affected the dates of first and full bloom, and ‘D’Anjou’ trees with ‘BP-1’ and ‘BP-2’ interstems had a significantly longer bloom period than the non-interstemed trees. Interstemed ‘D’Anjou’ trees generally produced more flower clusters as compared to the non-interstemed controls; however, fruit set was not significantly increased in either cultivar. Yields in ‘D’Anjou’ trees with ‘BP-2’ interstems, and ‘Bartlett’ trees with ‘P. 2274’ interstems were significantly greater than the respective controls. The increase was due to fruit size. Fruit on ‘D’Anjou’ trees with ‘BP-2’ interstems was overly large, and in later years of the trial became very rough with large bumps. | |
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