The effects of girdling or partial cooling of scaffold branches were investigated for the improvement of berry coloration in 'BK Seedless' grape (Muscat Bailey A × Kyoho) under the high temperature condition in summer. Girdling of 2cm width carried out around veraison promoted berry coloring and increased sugar content of the berries. Partial cooling of scaffold branches with running cool water (15℃) made the temperature in the inner part fall to some extent; however, the coloring treatment did not show the significant effect on berry coloration and quality.
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