Abstract

ARANCIBIA URZUA, Gonzalo Nicolás; CALLEJAS RODRIGUEZ, Rodrigo  and  REGINATO MEZA, Gabino. Evaluation of growth regulators asthinners on 'Thompson Seedless' table grapes clusters. Rev. Fac. Cienc. Agrar., Univ. Nac. Cuyo [online]. 2017, vol.49, n.1, pp.01-14. ISSN 1853-8665.

In order to evaluate in the Region de Atacama and Region Metropolitana from Chile, the use of complementary thinners to the gibberellic acid (GA₃) applied to 'Thompson Seedless' grapes. This research explored the use of naphthalene acetic acid (NAA), thidiazuron (TDZ) and benzyladenine (BA) applied to flowering plants; and Wuxal® Ca in the fruit set. During the first season, prospective assays were performed. NAA was sprayed at: 0; 2.5; 5; 7.5; 10 and 12.5 mg·L^-1; BA tested concentrations were: 0, 60, 90, 120, 150 and 180 mg·L^-1, and TDZ concentrations were: 0; 0.5; 1; 1.5 and 2 mg·L^-1. During the second season, NAA was sprayed at 0; 2.5; 5.0 and 7.5 mg·L^-1 and BA was applied at 0, 150, 300, 450 and 600 mg·L^-1. On a thirth trial, 2 mg·L^-1 of NAA and Wuxal® Ca applied at bloom and fruit set, respectively. NAA decreased the number of berries for cluster; phytotoxicity was detected at concentration since 7.5 mg·L^-1. BA increased berry number with higher concentrations. TDZ did not show differences in thinning. Wuxal® Ca applied after NAA, decreased berry number per cluster, extending the effective period of thinning until after fruit set.

Keywords : Vitis vinifera L.; Thinning; Bloom; Plant growth regulators; Auxins; Cytokinins.

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