Articles
THE USE OF A FREEZING TECHNIQUE TO DETERMINE THE BUD HARDINESS OF TWENTY GRAPE GENOTYPES (VITIS SP.)
Article number
640_22
Pages
207 – 212
Language
English
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.
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.
Authors
D. Rekika, J. Cousineau, A. Levasseur, C. Richer, S. Khanizadeh, H. Fisher
Keywords
Vitis, freezing injury, grapevine, bud cold hardiness
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