A videira caracteriza-se como uma espécie exigente em tratos culturais, e para se alcançarem condições ótimas no momento da colheita, é fundamental que as técnicas de manejo sejam adequadas às características de cada região. A desfolha, nesse sentido, tem sido uma importante ferramenta de manejo do dossel vegetativo, podendo melhorar a composição química dos cachos e aumentar a eficiência produtiva da videira. O objetivo deste trabalho foi avaliar o manejo da desfolha em diferentes estádios fenológicos, sobre a eficiência produtiva e na composição química dos cachos da variedade Sauvignon Blanc cultivada em regiões de altitude. O experimento foi conduzido nas safras 2015 e 2016, em um vinhedo localizado no município de São Joaquim, SC (28°17’39”S e 49°55’56”W, 1230m). Os tratamentos consistiram em diferentes épocas de desfolhas, realizadas na região dos cachos nos estádios fenológicos: plena florada, grão chumbinho, grão ervilha, virada de cor das bagas, 15 dias após a virada de cor e sem desfolha (testemunha). Os dados foram submetidos à análise de variância (ANOVA) e comparados pelo Teste Scott-Knott a 5% de probabilidade de erro. Observou-se que a desfolha realizada até o estádio fenológico virada de cor propicia incremento no índice de fertilidade. O manejo da desfolha realizado nos estádios fenológicos grão ervilha e virada de cor apresentaram as maiores produtividades em relação aos demais estádios fenológicos e plantas não submetidas ao manejo da desfolha. Além disso, o manejo da desfolha melhorou a maturação tecnológica e fenólica da uva Sauvignon Blanc quando realizada nos estádios fenológicos grão chumbinho e grão ervilha, nas duas safras avaliadas. Os resultados deste trabalho evidenciam a importância no manejo da desfolha para obtenção de um mosto com potencial para elaboração de vinhos finos de qualidade, principalmente quando realizados entre os estádios fenológicos de grão chumbinho e grão ervilha. Portanto, a desfolha da videira Sauvignon Blanc em regiões de altitude deve ser considerada uma prática de manejo indispensável ao vitivinicultor

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Fertility of buds and pruning recommendation of different grapevine varieties grown in altitude regions of Santa Catarina State, Brazil Low bud fertility index is frequently observed in different grapevine varieties grown in high altitude of Santa Catarina Sate; in many cases less than one cluster per bud is observed. The objective of this study was to assess bud fertility of twenty six Vitis vinifera L. varieties and from this information, to recommend the method of pruning more suitable for these varieties in high altitude conditions. The grapevine canes and buds were collected from production vineyards located in São Joaquim, Santa Catarina State, in two consecutive vintages. Fifteen cane cuttings containing 10 nodes per variety were collected to determine bud fertility and placed in a growth chamber with controlled relative humidity, light, temperature. After budbreak, buds were classified as fertile or non-fertile according to the presence or absence of the inflorescence. The bud fertility varies according to the variety and its position in the cane. Merlot, Cabernet Franc, Cabernet Sauvignon, Tinta Roriz and Tinta Caiada, which present higher fertility in basal buds, are recommended for short or long pruning. The varieties Chardonnay, Manzoni Bianco, Sauvignon Blanc, Sangiovese, Pinot Gris, Tempranillo, Pinot Noir, Syrah, Montepulciano, and Touriga Nacional should be pruned preferentially in long pruning. While the varieties Viognier, Glera (Prosecco), Fiano, Garganega, Vermentino, Nebbiolo, Teroldego, Rebo, Canaiolo Nero and Touriga Francesa must be pruned exclusively with long pruning in order to ensure adequate cluster production.

The objective of this work was to compare the effect of different times of leaf removal on the vegetative-productive efficiency and on the chemical and physical characteristics of 'Cabernet Sauvignon' clusters in a high-altitude region of the state of Santa Catarina, Brazil. The experiment was conducted in the 2015 and 2016 vintages, in a commercial vineyard, located in the municipality of São Joaquim, in the state of Santa Catarina, at 1,230-m altitude. The treatments consisted of different times leaf removal in the cluster zone, in the following phenological stages: full bloom, buckshot berries, pea-sized berries, veraison, and 15 days after veraison, besides a control without leaf removal. The evaluated variables were subjected to the analysis of variance and compared with the Scott-Knott test, at 5% probability. In a high-altitude region, leaf removal provides more adequate indices for plant vegetative:yield balance. It also increases yield when performed during the pea-sized berry and veraison stages, increases the fertility index when performed during the pea-sized berry stage, and improves the chemical composition of 'Cabernet Sauvignon' grape when performed up to the pea-sized berry stage. The obtained results show the importance of early leaf removal to obtain must with potential for the production of quality wines.

The objective of this work was to evaluate the effect of increasing bud load per plant on epidemiological variables of downy mildew on 'Sauvignon Blanc'. The study was carried out in a commercial vineyard in a high-altitude region of the municipality of São Joaquim, in the state of Santa Catarina, Brazil, during the 2016/2017 and 2017/2018 vintages. The treatments consisted of four bud loads: 15, 30, 50, and 75 per vine. The maximum incidence, maximum severity, beginning of symptom appearance, time to reach maximum disease incidence and severity, area under the incidence and severity disease progress curve were determined. Increasing bud load over 50 per vine results in higher incidence and severity of downy mildew (Plasmopara viticola) in 'Sauvignon Blanc' leaves but does not influence the time to reach maximum disease incidence and severity. Increasing bud load over 50 per vine results in an increase in the area under the disease incidence and severity progress curve for downy mildew in 'Sauvignon Blanc' leaves. To adopt over 50 buds per vine treatment, it is necessary additional disease control measures, with an emphasis on integrated management to control downy mildew.

The objective of this work was to compare the effect of the Y-trellis and vertical shoot position trellis (VSP) training systems on the physicochemical composition and aromatic profile of 'Sauvignon Blanc' (Vitis vinifera) wines in a high-altitude region of the state of Santa Catarina, Southern Brazil. The experiment was conducted during the 2015 vintage in a commercial vineyard located in the municipality of São Joaquim. The treatments consisted of the training systems: Y-trellis and VSP pruned in spur cordon. Sixty kilograms of grapes were harvested from each training system to make the wines, which were evaluated as to their chemical and phenolic composition and aromatic profile. There is no effect of the training system on the wine chemical variables pH, total acidity, color, and total polyphenols. The aromatic profile and phenolic composition of the wines are affected by the training systems, being related to the variables ethyl acetate, isoamyl acetate, 3-methyl-1-butanol, propanoic acid, and gallic acid in the Y-trellis, and to 1-hexanol, isovaleric acid, caprylic acid, capric acid, and catechin in VSP. The Y-trellis system can be an alternative for high-altitude regions of Southern Brazil.