ISHS Acta Horticulturae 585: VIII International Rubus and Ribes Symposium
SCHEDULING SUMMER-BEARING RED RASPBERRIES IN GREENHOUSES IN ONTARIO |
| Authors: | A. Dale, A. Gilley, E. Kent |
| Keywords: | Rubus idaeus, dormancy, flower bud initiation |
| Abstract:
From 1994 -1998 we were able to schedule potted ‘Titan’ red raspberry to produce fruit in a greenhouse from April through June. In 1997, ‘Nova’ and ‘Titan’ were vernalized at 7°C or 3°C for 6 or 8 weeks, every two weeks from 12 Sept. - 28 Oct. In ‘Nova’, lateral branches developed normally after 6 weeks at 7°C but ‘Titan’ had not completely broken dormancy after 8 weeks at 3°C. In 1999, ‘Nova’ and ‘Tulameen’, were vernalized at 7°C for 4, 5, 6, 7 or 8 weeks on 25 Aug. or 22 Sept. or vernalized in the field for the same periods of time. Both cultivars had broken dormancy after 5 weeks of 7°C. However, in the 22 Aug. treatment, laterals developed that had not initiated flowers. These results indicate that it is possible to manipulate summer-fruiting raspberries to crop plants sequentially from early January to late June, but that the timing of flower initiation is crucial for the plants to produce sufficient fruit. | |
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