Abstract
Manual horizontal cluster division may constitute an efficient tool to optimize wine composition. To test this hypothesis and to determine the optimal timing of this viticultural practice, the impact of cluster division on cluster morphology, bunch rot disease severity, and harvest parameters such as yield and total soluble solids was examined on the white Vitis vinifera L. cultivars Pinot gris and Riesling in the Luxembourgish winegrowing region in 2010 and 2011. Treatments were applied at five different times between prebloom (BBCH 57) and veraison (BBCH 81). In both varieties, all postbloom cluster division treatments were able to loosen the cluster structure and reduce the bunch rot disease severity. The later cluster division took place, the more pronounced were the effects on cluster structure. The density index was a suitable measure of the cluster structure and the predisposition to bunch rot infestation. Cluster division resulted in yield reductions (up to 30%), which increased with time after flowering. Postbloom cluster division may help to optimize wine quality by improving grape maturity due to crop load reduction, reducing fungal contamination, and improving grape composition through the possibility of elongating the ripening period. Postbloom horizontal cluster division can be recommended as an efficient crop cultural tool for premium wine production under cool-climate conditions.
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Claims 8
Claim · model-written summary
Postbloom cluster division loosened cluster structure in Pinot gris and Riesling.
- Taxon
- Vitis vinifera L.
Vitis viniferae1 - Material
- Pinot gris and Rieslinge1
- Treatment
- postbloom cluster division treatmentse0
- Outcome
- cluster structuree0
- Direction
- loosene0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In both varieties, all postbloom cluster division treatments were able to loosen the cluster structure”
e1“white Vitis vinifera L. cultivars Pinot gris and Riesling”
Claim · model-written summary
Postbloom cluster division reduced bunch rot severity in both grape cultivars.
- Taxon
- Vitis vinifera L.Vitis viniferae1
- Material
- Pinot gris and Rieslinge1
- Treatment
- postbloom cluster division treatmentse0
- Outcome
- bunch rot disease severitye0
- Direction
- reducee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In both varieties, all postbloom cluster division treatments were able to loosen the cluster structure and reduce the bunch rot disease severity”
e1“white Vitis vinifera L. cultivars Pinot gris and Riesling”
Claim · model-written summary
Later cluster division had more pronounced effects on grape cluster structure.
- Taxon
- Vitis vinifera L.Vitis viniferae1
- Treatment
- cluster divisione0
- Outcome
- effects on cluster structuree0
- Direction
- more pronouncede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The later cluster division took place, the more pronounced were the effects on cluster structure”
e1“white Vitis vinifera L. cultivars Pinot gris and Riesling”
Claim · model-written summary
Density index was suitable to measure grape cluster structure.
- Taxon
- Vitis vinifera L.Vitis viniferae1
- Outcome
- cluster structuree0
- Qualifier
- suitable measuree0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The density index was a suitable measure of the cluster structure and the predisposition to bunch rot infestation”
e1“white Vitis vinifera L. cultivars Pinot gris and Riesling”
Claim · model-written summary
Density index was suitable to measure predisposition to bunch rot infestation.
- Taxon
- Vitis vinifera L.Vitis viniferae1
- Outcome
- predisposition to bunch rot infestatione0
- Qualifier
- suitable measuree0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The density index was a suitable measure of the cluster structure and the predisposition to bunch rot infestation”
e1“white Vitis vinifera L. cultivars Pinot gris and Riesling”
Claim · model-written summary
Cluster division reduced grape yield by up to 30%.
- Taxon
- Vitis vinifera L.Vitis viniferae1
- Treatment
- Cluster divisione0
- Outcome
- yielde0
- Direction
- reductionse0
- Value
- up to 30%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cluster division resulted in yield reductions (up to 30%)”
e1“white Vitis vinifera L. cultivars Pinot gris and Riesling”
Claim · model-written summary
Yield reductions from cluster division increased with time after flowering.
- Taxon
- Vitis vinifera L.Vitis viniferae1
- Treatment
- Cluster divisione0
- Outcome
- yield reductionse0
- Direction
- increasede0
- Qualifier
- time after floweringe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cluster division resulted in yield reductions (up to 30%), which increased with time after flowering”
e1“white Vitis vinifera L. cultivars Pinot gris and Riesling”
Claim · model-written summary
The authors recommend postbloom horizontal cluster division for premium wine production in cool climates.
- Taxon
- Vitis vinifera L.Vitis viniferae1
- Outcome
- Postbloom horizontal cluster divisione0
- Qualifier
- under cool-climate conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Postbloom horizontal cluster division can be recommended as an efficient crop cultural tool for premium wine production under cool-climate conditions”
e1“white Vitis vinifera L. cultivars Pinot gris and Riesling”
The same questions in other papers
cluster · yield · Vitis vinifera (wine grape)Results differ
6 papers in the same direction as this paper · 8 in the opposite direction
- positive
- positive
- positive
11 papers more in this group
See all 15 papers →cluster · soil: physics · Vitis vinifera (wine grape)Positive and negative results
1 in the opposite direction
- no effect
cluster · disease · Vitis vinifera (wine grape)Results agree
1 paper in the same direction as this paper
- positive
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.