Abstract
Viticulture in Michigan is limited by a cool and humid climate and as a result, there is a problem of harvest season cluster rot, especially in cultivars with compact cluster morphology. Economically important wine grape varieties in eastern North America possess varying susceptibility to harvest season cluster rot. Some important cultivars that are susceptible are Pinot gris, Pinot noir, Riesling ( Vitis vinifera L.) as well as Seyval and Vignoles (French–American hybrids or interspecific hybrid cultivars). A common characteristic of these cultivars is the compactness of the berries held on the cluster rachis. The aim of this work was to determine whether a quantified amount of leaf removal or a temporary reduction in carbon assimilation at the beginning of bloom would reduce fruit set and cluster compactness. Vines subjected to removal of four or six basal leaves had an average fruit set reduction of ≈45% from a non-treated control. Cluster weight and berries per cluster were similarly reduced with a greater effect on the basal than the apical cluster of the shoot. Reduced fruit set was associated with a reduction in cluster compactness and harvest season rot. This was also reflected in yield and basic fruit chemistry parameters associated with the importance of basal leaves to the developing cluster. Multiple applications of stylet oil at different time intervals resulted in significant reduction in net photosynthesis (P n ). A single application had no significant impact on P n , whereas multiple applications reduced leaf assimilation rates. However, this reduction in P n did not reduce fruit set or improve cluster compactness. There was a strong negative effect of early leaf removal in Year 1 on vine performance in Year 2; this carryover effect increased shootless nodes per vine, reduced the number of clusters per shoot and per vine, and dramatically reduced fruit set and consequently yield per vine.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 16
Claim · model-written summary
Four basal leaf removal reduced fruit set about 45%.
- Treatment
- removal of foure0
- Outcome
- fruit sete0
- Direction
- reductione0
- Value
- ≈45%e0
- Comparator
- non-treated controle0
VitisOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vines subjected to removal of four or six basal leaves had an average fruit set reduction of ≈45% from a non-treated control.”
t0“Grapevines”
Claim · model-written summary
Six basal leaf removal reduced fruit set about 45%.
- Treatment
- six basal leavese0
- Outcome
- fruit sete0
- Direction
- reductione0
- Value
- ≈45%e0
- Comparator
- non-treated controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vines subjected to removal of four or six basal leaves had an average fruit set reduction of ≈45% from a non-treated control.”
t0“Grapevines”
Claim · model-written summary
Early leaf removal reduced cluster weight and berry count, more in basal clusters.
- Treatment
- Early Defoliationt0
- Outcome
- Cluster weight and berries per clustere0
- Direction
- reducede0
- Comparator
- apical clustere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cluster weight and berries per cluster were similarly reduced with a greater effect on the basal than the apical cluster of the shoot.”
t0“Effects of Early Defoliation on Yield, Fruit Composition, and Harvest Season Cluster Rot Complex of Grapevines”
Claim · model-written summary
Reduced fruit set was associated with reduced cluster compactness.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reduced fruit set was associated with a reduction in cluster compactness and harvest season rot.”
t0“Grapevines”
Claim · model-written summary
Reduced fruit set was associated with reduced harvest season rot.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reduced fruit set was associated with a reduction in cluster compactness and harvest season rot.”
t0“Grapevines”
Claim · model-written summary
These effects were reflected in yield.
- Outcome
- yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This was also reflected in yield and basic fruit chemistry parameters associated with the importance of basal leaves to the developing cluster.”
t0“Grapevines”
Claim · model-written summary
These effects were reflected in fruit chemistry.
- Outcome
- basic fruit chemistry parameterse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This was also reflected in yield and basic fruit chemistry parameters associated with the importance of basal leaves to the developing cluster.”
t0“Grapevines”
Claim · model-written summary
Multiple stylet oil applications significantly reduced net photosynthesis.
- Treatment
- Multiple applications of stylet oile0
- Outcome
- net photosynthesis (P n )e0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Multiple applications of stylet oil at different time intervals resulted in significant reduction in net photosynthesis (P n ).”
t0“Grapevines”
Claim · model-written summary
A single stylet oil application had no significant impact on photosynthesis.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A single application had no significant impact on P n , whereas multiple applications reduced leaf assimilation rates.”
t0“Grapevines”
Claim · model-written summary
Multiple stylet oil applications reduced leaf assimilation.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A single application had no significant impact on P n , whereas multiple applications reduced leaf assimilation rates.”
t0“Grapevines”
Claim · model-written summary
Reduced photosynthesis did not reduce fruit set.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this reduction in P n did not reduce fruit set or improve cluster compactness.”
t0“Grapevines”
Claim · model-written summary
Reduced photosynthesis did not improve cluster compactness.
- Organ / stage
- cluster compactnesse0
- Outcome
- cluster compactnesse0
- Direction
- did not reduce fruit set or improvee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this reduction in P n did not reduce fruit set or improve cluster compactness.”
t0“Grapevines”
Claim · model-written summary
Year 1 leaf removal increased shootless nodes in Year 2.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this carryover effect increased shootless nodes per vine, reduced the number of clusters per shoot and per vine, and dramatically reduced fruit set and consequently yield per vine.”
t0“Effects of Early Defoliation on Yield, Fruit Composition, and Harvest Season Cluster Rot Complex of Grapevines”
Claim · model-written summary
Year 1 leaf removal reduced Year 2 clusters per shoot and vine.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this carryover effect increased shootless nodes per vine, reduced the number of clusters per shoot and per vine, and dramatically reduced fruit set and consequently yield per vine.”
t0“Effects of Early Defoliation on Yield, Fruit Composition, and Harvest Season Cluster Rot Complex of Grapevines”
Claim · model-written summary
Year 1 leaf removal reduced Year 2 fruit set.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this carryover effect increased shootless nodes per vine, reduced the number of clusters per shoot and per vine, and dramatically reduced fruit set and consequently yield per vine.”
t0“Effects of Early Defoliation on Yield, Fruit Composition, and Harvest Season Cluster Rot Complex of Grapevines”
Claim · model-written summary
Year 1 leaf removal reduced Year 2 yield per vine.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this carryover effect increased shootless nodes per vine, reduced the number of clusters per shoot and per vine, and dramatically reduced fruit set and consequently yield per vine.”
t0“Effects of Early Defoliation on Yield, Fruit Composition, and Harvest Season Cluster Rot Complex of Grapevines”
The same questions in other papers
pruning · yield · VitisPositive and negative results
35 papers in the same direction as this paper · 71 in the opposite direction
- positive
- negative
- negative
103 papers more in this group
See all 107 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.