Abstract
Canopy management is vital for quality winegrape production. During the 2012 and 2013 growing seasons, the timing of fruit-zone leaf removal (FZLR) was evaluated in two commercial vineyard blocks (Vitis vinifera Riesling and Sauvignon blanc) located north of Prosser, WA. Three different timings of manual FZLR were evaluated with a no-removal control. Leaf removal consisted of complete removal of all leaves and lateral shoots in the fruit zone on both sides of the canopy at prebloom, bloom, and four weeks postbloom. Each vine received the same treatment in both years. No negative implications were observed in total fruit set in either year. When leaf removal was performed, regardless of timing, the fruit zone of the canopy had less lateral shoot development and canopy refill than the control. Leaf removal also improved spray coverage in the fruit zone in Riesling, but the effect was related to the timing of leaf removal relative to the timing of the spray. In 2013, prebloom leaf removal significantly reduced Botrytis bunch rot severity in Sauvignon blanc (p = 0.01) below that of the control and four weeks postbloom leaf removal treatments. In 2013, prebloom leaf removal in Riesling increased terpene concentrations in the harvested juice (p = 0.03). In 2012, postbloom leaf removal in Riesling reduced concentrations of acids below those of the prebloom treatment (p = 0.04) in juice.
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Claims 6
Claim · model-written summary
Leaf removal did not adversely affect total fruit set in either year.
- Taxon
- Vitis vinifera
Vitis viniferae1 - Treatment
- Leaf removale2
- Outcome
- total fruit sete0
- Direction
- No negative implicationse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No negative implications were observed in total fruit set in either year.”
e1“Vitis vinifera Riesling and Sauvignon blanc”
e2“Leaf removal consisted of complete removal”
Claim · model-written summary
Leaf removal reduced lateral shoot development and canopy refill relative to control, regardless of timing.
- Taxon
- Vitis viniferaVitis viniferae1
- Treatment
- leaf removale0
- Outcome
- lateral shoot development and canopy refille0
- Direction
- lesse0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When leaf removal was performed, regardless of timing, the fruit zone of the canopy had less lateral shoot development and canopy refill than the control.”
e1“Vitis vinifera Riesling and Sauvignon blanc”
Claim · model-written summary
Leaf removal improved spray coverage in Riesling, depending on timing relative to spraying.
- Taxon
- Vitis viniferaVitis viniferae1
- Material
- Rieslinge0
- Treatment
- Leaf removale0
- Outcome
- spray coveragee0
- Direction
- improvede0
- Qualifier
- timing of leaf removal relative to the timing of the spraye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf removal also improved spray coverage in the fruit zone in Riesling, but the effect was related to the timing of leaf removal relative to the timing of the spray.”
e1“Vitis vinifera Riesling and Sauvignon blanc”
Claim · model-written summary
Prebloom removal reduced Botrytis bunch rot severity in Sauvignon blanc in 2013 versus control and postbloom removal.
- Taxon
- Vitis viniferaVitis viniferae1
- Material
- Sauvignon blance0
- Treatment
- prebloom leaf removale0
- Outcome
- Botrytis bunch rot severitye0
- Direction
- reducede0
- Comparator
- control and four weeks postbloom leaf removal treatmentse0
BotrytisOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 2013, prebloom leaf removal significantly reduced Botrytis bunch rot severity in Sauvignon blanc (p = 0.01) below that of the control and four weeks postbloom leaf removal treatments.”
e1“Vitis vinifera Riesling and Sauvignon blanc”
Claim · model-written summary
Prebloom removal increased Riesling juice terpene concentrations in 2013.
- Taxon
- Vitis viniferaVitis viniferae1
- Material
- Rieslinge0
- Organ / stage
- harvested juicee0
- Treatment
- prebloom leaf removale0
- Outcome
- terpene concentrationse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 2013, prebloom leaf removal in Riesling increased terpene concentrations in the harvested juice (p = 0.03).”
e1“Vitis vinifera Riesling and Sauvignon blanc”
Claim · model-written summary
Postbloom removal reduced Riesling juice acid concentrations below prebloom removal in 2012.
- Taxon
- Vitis viniferaVitis viniferae1
- Material
- Rieslinge0
- Organ / stage
- juicee0
- Treatment
- postbloom leaf removale0
- Outcome
- concentrations of acidse0
- Direction
- reducede0
- Comparator
- prebloom treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 2012, postbloom leaf removal in Riesling reduced concentrations of acids below those of the prebloom treatment (p = 0.04) in juice.”
e1“Vitis vinifera Riesling and Sauvignon blanc”
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