Abstract
Background and Aims Recently, early defoliation (ED) has been used widely to regulate yield and reduce bunch compactness to improve tolerance to bunch rot. The aim of this study was to test ED, as an alternative to the conventional crop thinning (CT), to regulate yield and improve tolerance to bunch rot of the Vitis vinifera L. cv. Aragonez. Methods and Results Early defoliation and CT were compared with an untreated Control over three consecutive seasons in a commercial vineyard in Portugal. Early defoliation had little effect on tolerance to bunch rot and led to progressive loss of yield reducing fruitset, bunch number, berry number and mass, compared to Control vines. Reduced bunch number is likely to be a function of reduced bud fertility. Crop thinning also reduced yield but, unlike ED, the yield reduction was less and remained constant over the seasons studied. Both ED and CT had little effect on berry composition. Conclusions Among the two crop-regulating techniques, CT appears more suitable than ED to control grape yields in regions where yield limitations are imposed. The progressive yield decline caused by ED is likely to be not economically viable in the region studied. Significance of the Study Early defoliation reduces bud fertility in unirrigated vineyards under Mediterranean conditions. Therefore, this practice should be avoided under those conditions.
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Claims 10
Claim · model-written summary
Early defoliation had little effect on tolerance to bunch rot.
- Taxon
- Vitis vinifera L. cv. Aragonez
Vitis viniferat0 - Treatment
- Early defoliatione0
- Outcome
- tolerance to bunch rote0
- Direction
- little effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Early defoliation had little effect on tolerance to bunch rot”
t0“Vitis vinifera L. cv. Aragonez”
Claim · model-written summary
Early defoliation progressively reduced yield relative to control vines.
- Taxon
- Vitis vinifera L. cv. AragonezVitis viniferat0
- Treatment
- Early defoliatione1
- Outcome
- yielde0
- Direction
- progressive losse0
- Comparator
- Control vinese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“led to progressive loss of yield reducing fruitset, bunch number, berry number and mass, compared to Control vines.”
e1“Early defoliation had little effect on tolerance to bunch rot”
t0“Vitis vinifera L. cv. Aragonez”
Claim · model-written summary
Early defoliation reduced fruitset, bunch number and berry number relative to controls.
- Taxon
- Vitis vinifera L. cv. AragonezVitis viniferat0
- Treatment
- Early defoliatione1
- Outcome
- fruitset, bunch number, berry numbere0
- Direction
- reducinge0
- Comparator
- Control vinese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reducing fruitset, bunch number, berry number and mass, compared to Control vines.”
e1“Early defoliation had little effect on tolerance to bunch rot”
t0“Vitis vinifera L. cv. Aragonez”
Claim · model-written summary
Early defoliation reduced berry mass relative to controls.
- Taxon
- Vitis vinifera L. cv. AragonezVitis viniferat0
- Treatment
- Early defoliatione1
- Outcome
- masse0
- Direction
- reducinge0
- Comparator
- Control vinese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reducing fruitset, bunch number, berry number and mass, compared to Control vines.”
e1“Early defoliation had little effect on tolerance to bunch rot”
t0“Vitis vinifera L. cv. Aragonez”
Claim · model-written summary
Reduced bunch number was attributed to reduced bud fertility.
- Taxon
- Vitis vinifera L. cv. AragonezVitis viniferat0
- Organ / stage
- bude0
- Outcome
- Reduced bunch numbere0
- Qualifier
- reduced bud fertilitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reduced bunch number is likely to be a function of reduced bud fertility.”
t0“Vitis vinifera L. cv. Aragonez”
Claim · model-written summary
Crop thinning reduced yield less than early defoliation, with a constant effect across seasons.
- Taxon
- Vitis vinifera L. cv. AragonezVitis viniferat0
- Treatment
- Crop thinninge0
- Outcome
- yielde0
- Direction
- reducede0
- Qualifier
- less and remained constant over the seasons studiede0
- Comparator
- EDe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Crop thinning also reduced yield but, unlike ED, the yield reduction was less and remained constant over the seasons studied.”
t0“Vitis vinifera L. cv. Aragonez”
Claim · model-written summary
Early defoliation had little effect on berry composition.
- Taxon
- Vitis vinifera L. cv. AragonezVitis viniferat0
- Treatment
- EDe0
- Outcome
- berry compositione0
- Direction
- little effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both ED and CT had little effect on berry composition.”
t0“Vitis vinifera L. cv. Aragonez”
Claim · model-written summary
Crop thinning had little effect on berry composition.
- Taxon
- Vitis vinifera L. cv. AragonezVitis viniferat0
- Treatment
- CTe0
- Outcome
- berry compositione0
- Direction
- little effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both ED and CT had little effect on berry composition.”
t0“Vitis vinifera L. cv. Aragonez”
Claim · model-written summary
The authors preferred crop thinning for controlling grape yield where yield limits apply.
- Taxon
- Vitis vinifera L. cv. AragonezVitis viniferat0
- Outcome
- CT appears more suitable than ED to control grape yieldse0
- Comparator
- EDe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CT appears more suitable than ED to control grape yields in regions where yield limitations are imposed.”
t0“Vitis vinifera L. cv. Aragonez”
Claim · model-written summary
The authors advised against early defoliation in unirrigated Mediterranean vineyards.
- Taxon
- Vitis vinifera L. cv. AragonezVitis viniferat0
- Outcome
- this practice should be avoided under those conditionse0
- Setting
- unirrigated vineyards under Mediterranean conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Early defoliation reduces bud fertility in unirrigated vineyards under Mediterranean conditions. Therefore, this practice should be avoided under those conditions.”
t0“Vitis vinifera L. cv. Aragonez”
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