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Research Article

Delaying Budbreak to Reduce Freeze Damage: Seasonal Vine Performance and Wine Composition in Two Vitis vinifera Cultivars

Meredith J. Persico, Donald E. Smith, Michela Centinari
Am J Enol Vitic.  2021  72: 346-357  ; DOI: 10.5344/ajev.2021.20076

Article Figures & Data

Figures

  • Average phenological growth stage of Lemberger vines in 2018 (A) and 2019 (B) and percentage of buds that reached budbreak (Eichhorn-Lorenz [E-L] 5) in 2018 (C) and 2019 (D) at each sampling date. Treatments were a control (no delayed budbreak strategy applied), Amigo applied during dormancy at 8% or 10% (v/v), and late pruning applied when the three-most-apical buds averaged stage 7 on the E-L scale. For each date, different letters indicate differences between treatments based on Tukey’s honest significant difference test at 95% confidence. Letters of significance are ordered from top-down at each date as follows: 1) Control, 2) Amigo 8%, 3) Amigo 10%, and 4) Late pruning.
    Figure 1

    Average phenological growth stage of Lemberger vines in 2018 (A) and 2019 (B) and percentage of buds that reached budbreak (Eichhorn-Lorenz [E-L] 5) in 2018 (C) and 2019 (D) at each sampling date. Treatments were a control (no delayed budbreak strategy applied), Amigo applied during dormancy at 8% or 10% (v/v), and late pruning applied when the three-most-apical buds averaged stage 7 on the E-L scale. For each date, different letters indicate differences between treatments based on Tukey’s honest significant difference test at 95% confidence. Letters of significance are ordered from top-down at each date as follows: 1) Control, 2) Amigo 8%, 3) Amigo 10%, and 4) Late pruning.

  • Average phenological growth stage of Riesling vines in 2018 (A) and 2019 (B) and percentage of buds that reached budbreak (Eichhorn-Lorenz [E-L] 5) in 2018 (C) and 2019 (D) at each sampling date. Treatments were a control (no delayed budbreak strategy applied), Amigo applied during dormancy at 8% or 10% (v/v), and late pruning applied when the three-most-apical buds averaged stage 7 on the E-L scale, except for Riesling buds in 2018, which averaged E-L 9. For each date, different letters indicate differences between treatments based on Tukey’s honest significant difference test at 95% confidence. Letters of significance are ordered from top-down at each date as follows: 1) Control, 2) Amigo 8%, 3) Amigo 10%, and 4) Late pruning.
    Figure 2

    Average phenological growth stage of Riesling vines in 2018 (A) and 2019 (B) and percentage of buds that reached budbreak (Eichhorn-Lorenz [E-L] 5) in 2018 (C) and 2019 (D) at each sampling date. Treatments were a control (no delayed budbreak strategy applied), Amigo applied during dormancy at 8% or 10% (v/v), and late pruning applied when the three-most-apical buds averaged stage 7 on the E-L scale, except for Riesling buds in 2018, which averaged E-L 9. For each date, different letters indicate differences between treatments based on Tukey’s honest significant difference test at 95% confidence. Letters of significance are ordered from top-down at each date as follows: 1) Control, 2) Amigo 8%, 3) Amigo 10%, and 4) Late pruning.

Tables

  • Table 1

    Dates of 50% budbreak and harvest for Lemberger and Riesling grapevines at the experimental vineyard in 2018 and 2019.

    Table 1
  • Table 2

    Effect of Amigo and late pruning treatments on Lemberger percent veraison in mid-August and Lemberger and Riesling juice chemistry at harvest. TSS, total soluble solids; TA, titratable acidity.

    Table 2
  • Table 3

    Effect of Amigo and late pruning treatments on Riesling and Lemberger yield components and pruning weight in 2018 and 2019.

    Table 3
  • Table 4

    Effect of Amigo and late pruning treatments on Lemberger and Riesling on wine composition at bottling, vintage 2018 and 2019. TA, titratable acidity.

    Table 4
  • Table 5

    Effect of Amigo and late pruning treatments on total non-structural carbohydrate concentration in Lemberger and Riesling cane, trunk, and root tissues during vine acclimation in November 2018 and 2019. Concentrations are reported in mg glucose equivalents per g dry tissue weight.

    Table 5
  • Table 6

    Effect of Amigo and late pruning treatments on bud median low-temperature exotherm (°C) for Riesling and Lemberger vines at acclimation (November), maximum freeze tolerance (January or February), and deacclimation (March or April) during the 2018 to 2019 and 2019 to 2020 dormant seasons.

    Table 6
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Delaying Budbreak to Reduce Freeze Damage: Seasonal Vine Performance and Wine Composition in Two Vitis vinifera Cultivars
Meredith J. Persico, Donald E. Smith, Michela Centinari
Am J Enol Vitic.  2021  72: 346-357  ; DOI: 10.5344/ajev.2021.20076
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