Abstract
Early leaf removal is an innovative cultural practice for yield management in grapevines. The effects of timing (prebloom and fruit set) and method (manual or mechanical) of defoliation on yield components, Botrytis incidence, and wine sensory attributes of Vitis vinifera L. cv. Tempranillo VSP-trained grapevines were examined over two consecutive seasons, 2007 and 2008. Yield per vine was severely reduced (15 to 50%) by manual and mechanical leaf removal at prebloom in the two years and smaller clusters with fewer berries were obtained. At fruit set, only mechanical defoliation was effective at modifying cluster weight, berry number, and yield per vine. Botrytis rot incidence was significantly reduced by early leaf removal in 2008, when an overall higher infection rate was linked to unusually high rainfall. Total leaf area was generally unaffected by early leaf removal. Prebloom defoliation exhibited full recovery of leaf:fruit ratios compared with nondefoliated vines, regardless of defoliation method. Descriptive analysis of the aroma attributes of the wines revealed lowered intensity of fruity, floral, and licorice in the defoliated samples in 2007. Intensity scores for these descriptors were positively correlated to yield and negatively correlated to total leaf area:yield ratio. When Botrytis rot was widespread, the extent of infection was negatively correlated to certain fruity and floral aromas and positively correlated to dried fruit character. Several factors linked to early defoliation, such as yield, Botrytis, and cluster exposure significantly contributed to final wine aroma properties. Principal component analysis illustrated the separation of wines from defoliated and nondefoliated treatments by aroma profile.
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Claims 14
Claim · model-written summary
Prebloom manual defoliation reduced vine yield by 15 to 50% in both years.
Not reportedComparator
Verbatim
e0“Yield per vine was severely reduced (15 to 50%) by manual and mechanical leaf removal at prebloom in the two years and smaller clusters with fewer berries were obtained.”
Claim · model-written summary
Prebloom mechanical defoliation reduced vine yield by 15 to 50% in both years.
- Taxon
- vinee0
- Treatment
- mechanical leaf removal at prebloome0
- Outcome
- Yield per vinee0
- Direction
- reducede0
- Value
- 15 to 50%e0
Not reportedComparator
Verbatim
e0“Yield per vine was severely reduced (15 to 50%) by manual and mechanical leaf removal at prebloom in the two years and smaller clusters with fewer berries were obtained.”
Claim · model-written summary
Prebloom defoliation produced smaller clusters and fewer berries.
- Taxon
- vinee0
- Treatment
- leaf removal at prebloome0
- Outcome
- smaller clusters with fewer berriese0
- Direction
- smallere0
Not reportedComparator
Verbatim
e0“Yield per vine was severely reduced (15 to 50%) by manual and mechanical leaf removal at prebloom in the two years and smaller clusters with fewer berries were obtained.”
Claim · model-written summary
At fruit set, mechanical defoliation modified cluster weight, berry number, and vine yield.
- Taxon
- vinee0
- Treatment
- mechanical defoliatione0
- Outcome
- cluster weight, berry number, and yield per vinee0
- Direction
- modifyinge0
Not reportedComparator
Verbatim
e0“At fruit set, only mechanical defoliation was effective at modifying cluster weight, berry number, and yield per vine.”
Claim · model-written summary
Early leaf removal reduced Botrytis rot incidence in rainy 2008.
- Taxon
- Vitis viniferaL.
Vitis viniferat0 - Treatment
- early leaf removale0
- Outcome
- Botrytis rot incidencee0
- Direction
- reducede0
- Qualifier
- in 2008e0
BotrytisNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Botrytis rot incidence was significantly reduced by early leaf removal in 2008, when an overall higher infection rate was linked to unusually high rainfall.”
t0“Vitis viniferaL. Tempranillo Wine”
Claim · model-written summary
Early leaf removal generally did not affect total leaf area.
Not reportedComparator
Verbatim
e0“Total leaf area was generally unaffected by early leaf removal.”
Claim · model-written summary
Prebloom defoliation allowed full recovery of leaf to fruit ratio, regardless of method.
Verbatim
e0“Prebloom defoliation exhibited full recovery of leaf:fruit ratios compared with nondefoliated vines, regardless of defoliation method.”
Claim · model-written summary
Wines from defoliated vines had lower fruity, floral and licorice aroma intensity in 2007.
- Taxon
- winese0
- Treatment
- defoliatede0
- Outcome
- intensity of fruity, floral, and licoricee0
- Direction
- lowerede0
Not reportedComparator
Verbatim
e0“Descriptive analysis of the aroma attributes of the wines revealed lowered intensity of fruity, floral, and licorice in the defoliated samples in 2007.”
Claim · model-written summary
Fruity, floral and licorice aroma intensity was positively correlated with yield.
Verbatim
e0“Intensity scores for these descriptors were positively correlated to yield and negatively correlated to total leaf area:yield ratio.”
Claim · model-written summary
Fruity, floral and licorice aroma intensity was negatively correlated with leaf area to yield ratio.
Verbatim
e0“Intensity scores for these descriptors were positively correlated to yield and negatively correlated to total leaf area:yield ratio.”
Claim · model-written summary
Botrytis infection was negatively correlated with fruity and floral aromas.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When Botrytis rot was widespread, the extent of infection was negatively correlated to certain fruity and floral aromas and positively correlated to dried fruit character.”
Claim · model-written summary
Botrytis infection was positively correlated with dried fruit character.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When Botrytis rot was widespread, the extent of infection was negatively correlated to certain fruity and floral aromas and positively correlated to dried fruit character.”
Claim · model-written summary
Yield, Botrytis and cluster exposure contributed to final wine aroma.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Several factors linked to early defoliation, such as yield, Botrytis, and cluster exposure significantly contributed to final wine aroma properties.”
Claim · model-written summary
Aroma profiles separated wines of defoliated and nondefoliated vines.
Verbatim
e0“Principal component analysis illustrated the separation of wines from defoliated and nondefoliated treatments by aroma profile.”
The same questions in other papers
pruning · Botrytis · Vitis vinifera (wine grape)Results agree
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See all 10 papers →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.