Abstract
Prohexadione-calcium (ProCa) has emerged as one of the most important management tools that an orchardist has available to control vegetative growth and to reduce the incidence and severity of fire blight. It has also been implicated in increased fruit set on treated apple trees. This investigation was initiated to confirm the effects of ProCa on fruit set and to evaluate different thinning strategies that might be used to appropriately thin treated trees. ProCa increased fruit set when applied at petal fall at initial rates of 125 or 250 mg·L −1 in three of the four experiments described in this article. Thinners were applied before, at the time of, and after application of ProCa. In all experiments, chemical thinners did not reduce fruit set to the same crop load level on ProCa-treated trees as they did on untreated trees. It was concluded that a different and more aggressive chemical thinning strategy must be used on trees that were treated with ProCa. Fruit size was reduced on ProCa-treated trees. This reduction was usually, but not always, related to increased fruit set. ProCa increased the number of pygmy fruit on ‘Delicious’ apple trees.
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 5
Claim · model-written summary
ProCa applied at petal fall at 125 or 250 mg·L −1 increased fruit set in three of four experiments.
- Taxon
- apple trees
Malus domesticat0 - Treatment
- applied at petal fall at initial rates of 125 or 250 mg·L −1e1
- Outcome
- fruit sete1
- Direction
- increasede1
- Qualifier
- in three of the four experimentse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Apple Trees”
e1“ProCa increased fruit set when applied at petal fall at initial rates of 125 or 250 mg·L −1 in three of the four experiments described in this article”
Claim · model-written summary
Chemical thinners did not reduce fruit set to the same crop load level on ProCa-treated apple trees as on untreated trees.
- Taxon
- apple treesMalus domesticat0
- Treatment
- chemical thinnerse2
- Outcome
- fruit set to the same crop load levele2
- Direction
- did not reducee2
- Comparator
- untreated treese2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Apple Trees”
e2“In all experiments, chemical thinners did not reduce fruit set to the same crop load level on ProCa-treated trees as they did on untreated trees”
Claim · model-written summary
ProCa-treated apple trees require a different and more aggressive chemical thinning strategy.
- Taxon
- apple treesMalus domesticat0
- Treatment
- ProCae3
- Outcome
- different and more aggressive chemical thinning strategye3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Apple Trees”
e3“It was concluded that a different and more aggressive chemical thinning strategy must be used on trees that were treated with ProCa”
Claim · model-written summary
Fruit size was reduced on ProCa-treated apple trees, usually but not always related to increased fruit set.
- Taxon
- apple treesMalus domesticat0
- Treatment
- ProCae4
- Outcome
- Fruit sizee4
- Direction
- reducede4
- Qualifier
- usually, but not always, related to increased fruit sete5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Apple Trees”
e4“Fruit size was reduced on ProCa-treated trees”
e5“This reduction was usually, but not always, related to increased fruit set”
Claim · model-written summary
ProCa increased the number of pygmy fruit on Delicious apple trees.
- Taxon
- apple treesMalus domesticae6
- Material
- Deliciouse6
- Treatment
- ProCae6
- Outcome
- number of pygmy fruite6
- Direction
- increasede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Apple Trees”
e6“ProCa increased the number of pygmy fruit on ‘Delicious’ apple trees”
The same questions in other papers
prohexadione-calcium · yield · Malus domestica (apple)Results differ
5 papers in the same direction as this paper · 4 in the opposite direction
- no effect
- negative
- positive
6 papers more in this group
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.