ISHS Acta Horticulturae 640: XXVI International Horticultural Congress: Viticulture - Living with Limitations
THE USE OF A FREEZING TECHNIQUE TO DETERMINE THE BUD HARDINESS OF TWENTY GRAPE GENOTYPES (VITIS SP.) |
| Authors: | D. Rekika, J. Cousineau, A. Levasseur, C. Richer, S. Khanizadeh, H. Fisher |
| Keywords: | Vitis, freezing injury, grapevine, bud cold hardiness |
| Abstract:
Pencil-thick canes from 20 grape cultivars (Vitis sp.) were harvested in October and November, 2000. These cultivars had previously been classified as hardy (A), semi-hardy (B) or tender (C). Single-bud cane sections were placed in a refrigeration unit and subjected to sequential freezing temperatures (-7, -15, -22 and -30ºC) and held for 24 h at each temperature before being removed for evaluation. October samples had almost 100% bud kill from all cultivars at -22º and colder. There was a marked separation among the three cultivar groups at -15ºC, being 46, 68, and 94% mortality for A, B, and C, respectively. By the November sampling, most of the hardy cultivars (A) were relatively little affected at -22ºC, whereas, groups B and C suffered 25 and 83% mortality, respectively. In spite of this, considerable hardiness had been gained with the extra month exposed to the natural elements. | |
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