Expansion of the treatment stage of girdling for improvement of berry skin coloration in seedless 'Kyoho' grape [Vitis] cultivation
2010
Fujishima, H., Fukuoka-ken. Agricultural Research Center, Chikushino (Japan) | Matsuda, K. | Ushijima, K. | Yahata, D.
We compared the effect of girdling stage on berry quality for periods of 34-35 days after full bloom (pre-veraison) and 48-55 days after full bloom (post-veraison) to expand the treatment stage in seedless' Kyoho' grape (Vitis labruscana x V. vinifera) cultivation. Soluble solids content (SSC) tended to be increased immediately after both treatments, especially for pre-veraison girdling. The SSC of mature berries was also high in girdled vines. A similar effect of girdling was observed in the color index of berry skin. The effect of girdling on berry weight and titratable acidity was small. These findings indicate that girdling at 48-55 days after full bloom is effective in improving of berry skin coloration in seedless 'Kyoho' grape cultivation, resulting in the expansion of the treatment stage of girdling after veraison.
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