Paper · 1971 · Journal of the American Society for Horticultural Science

Effects of Annual Sprays of Succinic Acid-2,2-dimethylhydrazide on Vegetative Growth, Fruiting, Fruit Quality and Pre-Harvest Drop of ‘Delicious’ Apple Trees1

William J. Lord

8
claims
16
verbatim quotes
6
citations
4
research areas
✓
Open access · cc-by-nc-nd

Abstract

Abstract Six consecutive, single, annual applications of succinic acid–2,2-dimethylhydrazide (SADH) were applied, commencing with 2-year-old trees, in mid-July (51-67 days after full bloom) or mid-August at rates of 1000, 2000 or 4000 ppm. Other trees in the same block received 3 consecutive annual applications of 500 or 1000 ppm SADH in mid-June (31-40 days after full bloom) or mid-July. All SADH treatments delayed fruit flesh softening and reduced the severity of watercore and pre-harvest drop, but had no effect on trunk circumference increase, amount of bloom and fruit set. There was no terminal growth suppression of practical significance. With the exception of 500 ppm in mid-June or mid-July, all SADH treatments depressed fruit size. SADH suppressed rate of fruit growth and induced the formation of flatter fruits with shortened, thickened stems.

Abstract from the paper’s OpenAlex record; open copy licensed cc-by-nc-nd. 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 8

Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

All SADH treatments delayed fruit flesh softening.

Taxon
Apple TreesMalus domesticat0
Treatment
SADH treatmentse0
Outcome
fruit flesh softeninge0
Direction
delayede0

Not reportedComparator

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Malus domestica
Malus domestica · TaxonW.carter · CC0 · Wikimedia Commons ↗

Verbatim

e0

“All SADH treatments delayed fruit flesh softening and reduced the severity of watercore and pre-harvest drop”

✓ located verbatim in the source · abstract, characters 392–500 · show in text ↑
t0

“Apple Trees”

✓ located verbatim in the source · title, characters 146–157 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

All SADH treatments reduced watercore severity.

Taxon
Apple TreesMalus domesticat0
Treatment
SADH treatmentse0
Outcome
severity of watercoree0
Direction
reducede0

Not reportedComparator

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Malus domestica
Malus domestica · TaxonW.carter · CC0 · Wikimedia Commons ↗

Verbatim

e0

“All SADH treatments delayed fruit flesh softening and reduced the severity of watercore and pre-harvest drop”

✓ located verbatim in the source · abstract, characters 392–500 · show in text ↑
t0

“Apple Trees”

✓ located verbatim in the source · title, characters 146–157 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

All SADH treatments reduced preharvest drop.

Taxon
Apple TreesMalus domesticat0
Treatment
SADH treatmentse0
Outcome
pre-harvest drope0
Direction
reducede0

Not reportedComparator

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Malus domestica
Malus domestica · TaxonW.carter · CC0 · Wikimedia Commons ↗

Verbatim

e0

“All SADH treatments delayed fruit flesh softening and reduced the severity of watercore and pre-harvest drop”

✓ located verbatim in the source · abstract, characters 392–500 · show in text ↑
t0

“Apple Trees”

✓ located verbatim in the source · title, characters 146–157 · show in text ↑
Intervention effectobservedoriginal resultno effectmeasured

Claim · model-written summary

SADH had no effect on trunk circumference increase, bloom or fruit set.

Taxon
Apple TreesMalus domesticat0
Treatment
SADH treatmentse0
Outcome
trunk circumference increase, amount of bloom and fruit sete0
Direction
no effecte0

Not reportedComparator

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Malus domestica
Malus domestica · TaxonW.carter · CC0 · Wikimedia Commons ↗

Verbatim

e0

“All SADH treatments delayed fruit flesh softening and reduced the severity of watercore and pre-harvest drop, but had no effect on trunk circumference increase, amount of bloom and fruit set.”

✓ located verbatim in the source · abstract, characters 392–583 · show in text ↑
t0

“Apple Trees”

✓ located verbatim in the source · title, characters 146–157 · show in text ↑
Observationobservedoriginal resultno effectmeasured

Claim · model-written summary

Terminal growth suppression was not practically significant.

Taxon
Apple TreesMalus domesticat0
Outcome
terminal growth suppressione0
Direction
noe0
Qualifier
of practical significancee0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Malus domestica
Malus domestica · TaxonW.carter · CC0 · Wikimedia Commons ↗

Verbatim

e0

“There was no terminal growth suppression of practical significance.”

✓ located verbatim in the source · abstract, characters 584–651 · show in text ↑
t0

“Apple Trees”

✓ located verbatim in the source · title, characters 146–157 · show in text ↑
Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

All SADH treatments except 500 ppm in mid-June or mid-July reduced fruit size.

Taxon
Apple TreesMalus domesticat0
Treatment
SADH treatmentse0
Outcome
fruit sizee0
Direction
depressede0
Qualifier
With the exception of 500 ppm in mid-June or mid-Julye0

Not reportedComparator

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Malus domestica
Malus domestica · TaxonW.carter · CC0 · Wikimedia Commons ↗

Verbatim

e0

“With the exception of 500 ppm in mid-June or mid-July, all SADH treatments depressed fruit size.”

✓ located verbatim in the source · abstract, characters 652–748 · show in text ↑
t0

“Apple Trees”

✓ located verbatim in the source · title, characters 146–157 · show in text ↑
Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

SADH reduced fruit growth rate.

Taxon
Apple TreesMalus domesticat0
Treatment
SADHe0
Outcome
rate of fruit growthe0
Direction
suppressede0

Not reportedComparator

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Malus domestica
Malus domestica · TaxonW.carter · CC0 · Wikimedia Commons ↗

Verbatim

e0

“SADH suppressed rate of fruit growth and induced the formation of flatter fruits with shortened, thickened stems.”

✓ located verbatim in the source · abstract, characters 749–862 · show in text ↑
t0

“Apple Trees”

✓ located verbatim in the source · title, characters 146–157 · show in text ↑
Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

SADH produced flatter fruits with shortened, thickened stems.

Taxon
Apple TreesMalus domesticat0
Treatment
SADHe0
Outcome
flatter fruits with shortened, thickened stemse0
Direction
inducede0

Not reportedComparator

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Malus domestica
Malus domestica · TaxonW.carter · CC0 · Wikimedia Commons ↗

Verbatim

e0

“SADH suppressed rate of fruit growth and induced the formation of flatter fruits with shortened, thickened stems.”

✓ located verbatim in the source · abstract, characters 749–862 · show in text ↑
t0

“Apple Trees”

✓ located verbatim in the source · title, characters 146–157 · show in text ↑

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Daminozide · growth · Malus domestica (apple)Results differ

23 papers: 10 positive, 13 negative or no effect

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  1. positive
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Daminozide · quality: postharvest · Malus domestica (apple)Positive and negative results

14 papers: 12 positive, 2 negative or no effect

11 papers in the same direction as this paper · 2 in the opposite direction

  1. no effect
  2. no effect
  3. positive

10 papers more in this group

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Daminozide · disease · Malus domestica (apple)Results agree

3 papers: 3 positive, 0 negative or no effect

2 papers in the same direction as this paper

  1. positive
  2. positive
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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.