Abstract
Aims: The main objective of the fruit zone leaf removal is the microclimate improvement around fruits in order to enhance grape ripening and fruit health. The aim of this work was to investigate the consequences of manual or mechanical leaf removal according to the phenological stage (fruit set or véraison) on spraying efficiency, yield composition, berry colour, must and wine quality, and grape health. Methods and results: A three-year experiment (2001-2003) on the cv. Barbera was carried out in northwest Italy. Weather conditions during the three experimental seasons were very different. Leaf removal improved the efficiency of the fungicide application, reducing fungal diseases, but increased grape sensitivity to sunburn due to greater sunlight exposure. Some significant decrease on yield components was observed but not because of the same treatment. In leaf-removed vines, berry quality increased in the year least favourable for ripening (2002); in the warmer years, no quality improvement in must and wine was observed. Conclusion: Leaf removal effects are not strictly tied to intervention time; the main effects were due to the vintage weather conditions: in unfavourable ripening conditions, leaf removal can improve grape health and quality. Due to the higher level of bunch temperature induced by this technique, in warmer conditions its usefulness needs to be accurately evaluated. Although a faster process, mechanical leaf removal did not provide any substantially different results when compared to manual intervention. Significance and impact of study: The study showed potential and limits of leaf removal, suggesting that his application may vary, depending on climate and weather conditions of vineyards and vintage.
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Claims 7
Claim · model-written summary
Leaf removal improved fungicide application efficiency.
- Taxon
- Vitis Vinifera L.t0
- Treatment
- Leaf removale0
- Outcome
- efficiency of the fungicide applicatione0
- Direction
- improvede0
Not reportedComparator
Verbatim
e0“Leaf removal improved the efficiency of the fungicide application, reducing fungal diseases”
t0“Vitis Vinifera L.”
t1“leaf removal”
Claim · model-written summary
Leaf removal reduced fungal diseases.
Not reportedComparator
Verbatim
e0“Leaf removal improved the efficiency of the fungicide application, reducing fungal diseases”
t0“Vitis Vinifera L.”
t1“leaf removal”
Claim · model-written summary
Leaf removal increased grape sensitivity to sunburn.
- Taxon
- Vitis Vinifera L.t0
- Treatment
- leaf removalt1
- Outcome
- grape sensitivity to sunburne0
- Direction
- increasede0
- Qualifier
- greater sunlight exposuree0
Not reportedComparator
Verbatim
e0“increased grape sensitivity to sunburn due to greater sunlight exposure”
t0“Vitis Vinifera L.”
t1“leaf removal”
Claim · model-written summary
Some yield components decreased significantly under leaf removal treatments.
- Taxon
- Vitis Vinifera L.t0
- Treatment
- leaf removalt1
- Outcome
- yield componentse0
- Direction
- decreasee0
- Qualifier
- not because of the same treatmente0
Not reportedComparator
Verbatim
e0“Some significant decrease on yield components was observed but not because of the same treatment”
t0“Vitis Vinifera L.”
t1“leaf removal”
Claim · model-written summary
Leaf removal increased berry quality in the least favorable ripening year.
- Taxon
- Vitis Vinifera L.t0
- Treatment
- leaf-removede0
- Outcome
- berry qualitye0
- Direction
- increasede0
- Qualifier
- year least favourable for ripening (2002)e0
Not reportedComparator
Verbatim
e0“In leaf-removed vines, berry quality increased in the year least favourable for ripening (2002)”
t0“Vitis Vinifera L.”
t1“leaf removal”
Claim · model-written summary
Leaf removal did not improve must or wine quality in warmer years.
- Taxon
- Vitis Vinifera L.t0
- Treatment
- leaf removalt1
- Outcome
- quality improvement in must and winee0
- Direction
- no quality improvemente0
- Qualifier
- warmer yearse0
Not reportedComparator
Verbatim
e0“in the warmer years, no quality improvement in must and wine was observed”
t0“Vitis Vinifera L.”
t1“leaf removal”
Claim · model-written summary
Mechanical and manual leaf removal produced no substantially different results.
Verbatim
e0“mechanical leaf removal did not provide any substantially different results when compared to manual intervention”
t0“Vitis Vinifera L.”
t1“leaf removal”
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