Usage of Growth Regulators and Cluster Tipping to Improve Cluster Uniformity in Early Sweet Grapevine

Authors

  • Bedrech S.A. Viticulture Dept., Hort. Res. Inst, Agric. Res. Center, Giza, Egypt.
  • S. Gh. Farag Viticulture Dept., Hort. Res. Inst, Agric. Res. Center, Giza, Egypt.

Keywords:

Early Sweet, Gibberellic acid, Abscisic acid, Cluster tipping, Shot berries

Abstract

Shot berries is found to be one of the crucial drawbacks of the early ripening Vitis vinifera cv. Early Sweet as it decreases the cluster quality. The objective of this study was to assess the effect of two plant growth regulators PGR, (Gibberellic acid at 1mg/L and 20mg/L and Abscisic acid at 300mg/L) and cluster tipping in order to reduce the number of berries per cluster which led to improving berry size uniformity. Data collected from a commercial vineyard, over two successive seasons 2019-2020 comprised six treatments, suggested that all application significantly reduces berry number per cluster and improves uniformity of berry size within clusters except for the control. The results also indicated that the combined application of Gibberellic acid, Abscisic acid along with cluster tipping significantly was the highest in decreasing the number of berries/cluster and gave a uniform cluster, when applied at full bloom, besides increasing yield by lowering the number of shot berries per cluster. 

Published

10.03.2022