Abstract
From 1946 to 1950, field experiments were conducted to study the effects of 2,4-D and other plant growth regulators on navel oranges, with respect to fruit-drop (both young and mature fruits), yield, fruit size and quality, and susceptibility to water spot. In 1947, a progress report was prepared for growers. This included some of the results obtained by use of dilute 2,4-D sprays to reduce drop of mature, or nearly mature fruits. The present paper summarizes the 1947 findings and reports results obtained since that time. The earlier experiments were mainly concerned with effects of 2,4-D applied to trees bearing mature fruits, and the later experiments to those bearing young fruits. Generally, the 2,4-D was added to a mixture containing other spray chemicals. In nearly all cases, satisfactory control of fruit-drop was reported, and there were no reports of reduced yield, lower fruit quality, or tree injury when instructions were followed. When a severe drop of mature navel oranges is anticipated or in progress, spraying with 2,4-D is now becoming standard practice.
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Claims 6
Claim · model-written summary
Dilute 2,4-D sprays reduced drop of mature or nearly mature fruit.
- Taxon
- Washington Navel orangest0
- Treatment
- dilute 2,4-D sprayse0
- Outcome
- drop of mature, or nearly mature fruitse0
- Direction
- reducee0
Not reportedComparator
Verbatim
e0“dilute 2,4-D sprays to reduce drop of mature, or nearly mature fruits”
t0“Washington Navel oranges”
Claim · model-written summary
2,4-D gave satisfactory control of fruit drop in nearly all cases.
- Taxon
- Washington Navel orangest0
- Treatment
- 2,4-De1
- Outcome
- fruit-drope0
- Direction
- controle0
- Qualifier
- nearly all casese0
Not reportedComparator
Verbatim
e0“In nearly all cases, satisfactory control of fruit-drop was reported”
e1“2,4-D was added to a mixture containing other spray chemicals”
t0“Washington Navel oranges”
Claim · model-written summary
No reduced yield was reported when instructions were followed.
Verbatim
e0“there were no reports of reduced yield, lower fruit quality, or tree injury when instructions were followed”
t0“Washington Navel oranges”
Claim · model-written summary
No lower fruit quality was reported when instructions were followed.
Verbatim
e0“there were no reports of reduced yield, lower fruit quality, or tree injury when instructions were followed”
t0“Washington Navel oranges”
Claim · model-written summary
No tree injury was reported when instructions were followed.
Verbatim
e0“there were no reports of reduced yield, lower fruit quality, or tree injury when instructions were followed”
t0“Washington Navel oranges”
Claim · model-written summary
Spraying 2,4-D is becoming standard practice when severe mature-fruit drop is expected or underway.
- Taxon
- navel oranges
Citrus sinensise0 - Outcome
- spraying with 2,4-D is now becoming standard practicee0
- Qualifier
- When a severe drop of mature navel oranges is anticipated or in progresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When a severe drop of mature navel oranges is anticipated or in progress, spraying with 2,4-D is now becoming standard practice”
The same questions in other papers
2,4-D · yield · Citrus sinensis (sweet orange)Positive and negative results
12 papers in the same direction as this paper · 2 in the opposite direction
- no effect
- no effect
- positive
11 papers more in this group
See all 15 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.