The objective of this work was to characterize the productive and qualitative performances of 11 clones of 'Bordô' grape (Vitis labrusca) destined to wine and juice production, in the region of Vale do Rio do Peixe, in the state of Santa Catarina, Brazil. The experiment was carried out in the 2011, 2012, 2014, and 2015 crop seasons. The analyzed yield components were: number of clusters per vine, yield, cluster weight, accumulated yield, and alternate bearing index. The analyzed morphological characteristics of clusters were: number of berries per cluster, berry diameter, cluster compactness index, and cluster length. In order to assess grape quality, the following parameters were analyzed: soluble solids (SS), pH, titratable acidity (TA), SS/TA ratio, total anthocyanins, and total polyphenols. The 'Bordô' grape clones 13 and 16 ('Paco' and 'Bocaina') are the most suitable ones for cultivation in the wine producing region of Vale do Rio do Peixe, as they show the highest yields, production stability, and grapes with adequate quality for wine and juice elaboration.
The objective of this work was to evaluate the effect of different techniques to modify grape cluster architecture on the incidence and severity of botrytis bunch rot, as well as on the viticultural performance of the 'Sauvignon Blanc' grapevine (Vitis vinifera). Associated with fungicides, four treatments were tested: control, 30 ppm gibberellic acid sprayed at full bloom, 1,000 ppm prohexadione calcium sprayed at full bloom, and berry thinning at the stage of beginning of berry touch. The experiment was carried out in the 2015, 2016, and 2017 vintages. Clusters were treated with fungicides during the stages of full bloom, beginning of berry touch, veraison, and around 15 days before harvest. Berry thinning does not cause losses in the yield and quality of 'Sauvignon Blanc', and, despite having little effect on cluster architecture, is effective in reducing the incidence and severity of Botrytis cinerea. Prohexadione calcium improves grape phenolic maturation, is effective in reducing the incidence and severity of B. cinerea, and reduces cluster compactness by decreasing berry diameter. The application of gibberellic acid spray at full bloom is not recommended because it decreases yield and bud fertility and increases berry susceptibility to B. cinerea infection.
Resumo: Avaliaram-se fertilidade, teores de carboidratos solúveis totais e amido em gemas dormentes das viníferas ‘Greco di Tufo’, ‘Coda di Volpe’ e ‘Viognier’ em vinhedo localizado no município de São Joaquim, SC, no ano de 2013. A partir de ramos de ano em dormência profunda, as gemas foram observadas em três posições: gemas basais (1a à 3a gema), gemas medianas (4a à 6a gema) e gemas apicais (7a à 10a gema). A presença ou ausência de inflorescência foi avaliada pela brotação das gemas em câmara do tipo BOD. Em campo, as variedades foram avaliadas quanto aos sistemas de poda, em poda curta sob cordão esporonado e poda mista em guyot. As variedades Greco di Tufo e Coda di Volpe exibiram maior número de gemas férteis nos ramos em posições medianas e apicais. Foram observadas em BOD 79,2% e 75,0% de gemas férteis na posição apical dos ramos para as variedades Greco di Tufo e Coda di Volpe respectivamente. Os maiores teores de carboidratos solúveis totais foram encontrados para as três variedades nas gemas basais. Foram observadas variações entre variedades quanto ao teor de amido nas gemas em diferentes posições nos ramos.
Mandarins commercialization at international market requires seedless fruit production in addition to its ideal organoleptic and visual quality. The objective of the work was to evaluate the efficiency of applications of gibberellic acid and of copper sulfate during anthesis in reducing the number of seeds and in the productive performance of the 'Nadorcott' mandarin in the conditions of the southern Brazil. The experiment was performed in an orchard of 'Nadorcott' mandarin trees grafted on Poncirus trifoliata. Two applications were conducted at anthesis with different levels and combinations of gibberellic acid and copper sulfate. Also, a net was used as one of the treatments to prevent pollination. The net treatment provided a high frequency of seedless fruits, with greater skin color, however with less production. Gibberellic acid applications increased linearly the frequency of seedless fruits and with a maximum of two seeds. Copper sulphate applications did not affect any evaluated characteristics. Sprays of gibberellic acid of 100 mg L -1 concentration reduce the number of seeds per fruit and increase parthenocarpy, without effect on fruit size and peel color.
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