The effect of temperature on bud break of cuttings taken from eight tetraploid grape (Vitis labruscana) cultivars during different stages of dormancy (from the beginning of November to the end of January) was studied. The optimum temperature for bud break in cv. Pione was 20-25°C, that in cv. Kyoho was 25-30°C and that in cv. Fujiminori was 25°C. We also evaluated the interaction between date of cutting removal and effects of temperature on subsequent bud break in cv. Pione taken during dormancy.Cuttings taken in July and August broke dormancy best at 25-30°C, whereas those taken at later dates broke dormancy more uniformly, irrespective of temperature.
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