Abstract
Huanglongbing is an economically devastating disease of citrus in Florida and around the world. This study was undertaken to assess two grower-used therapies, heat treatment, and foliar anti-bacterial application. Specifically, there was an industry claim that heat treatment improved subsequent systemic uptake of foliar-applied anti-bacterial compounds. We hypothesized that new vegetative growth induced by heat treatment could lead to increased foliar delivery because of a greater number of new leaves in which cuticles would be more permeable. The study included two factors (1) heat treatment (with or without) and (2) pruning, in which all new leaves, all mature leaves, or no leaves were removed. A commercial formulation of oxytetracycline (OTC) was applied to plants with a non-ionic penetrant surfactant, but one branch on each tree was covered to assess direct versus systemic delivery. The study was repeated twice, destructively assessing whole-plant leaf area and dry weights, as well as OTC content in directly applied and covered leaves. Heat treatment and defoliation treatments reduced growth, but did not affect systemic delivery of OTC. OTC was detected in nearly all covered leaf samples in both repetitions, though at lower concentrations than in directly applied leaves. We conclude that neither heat treatment nor leaf age strongly affect systemic OTC delivery. Implications of this study for leaf age effects on foliar delivery and for phloem delivery of foreign compounds through foliar application are discussed.
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Claims 7
Claim · model-written summary
Heat treatment reduced citrus growth.
CitrusNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heat treatment and defoliation treatments reduced growth”
t0“Citrus”
Claim · model-written summary
Defoliation treatments reduced citrus growth.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heat treatment and defoliation treatments reduced growth”
t0“Citrus”
Claim · model-written summary
Heat treatment did not affect systemic oxytetracycline delivery in citrus.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heat treatment and defoliation treatments reduced growth, but did not affect systemic delivery of OTC”
e1“oxytetracycline (OTC)”
t0“Citrus”
Claim · model-written summary
Defoliation treatments did not affect systemic oxytetracycline delivery in citrus.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heat treatment and defoliation treatments reduced growth, but did not affect systemic delivery of OTC”
t0“Citrus”
Claim · model-written summary
Oxytetracycline was detected in nearly all covered citrus leaves in both repetitions.
- Organ / stage
- covered leaf samplese0
- Outcome
- OTC was detected in nearly all covered leaf samplese0
- Qualifier
- in both repetitionse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“OTC was detected in nearly all covered leaf samples in both repetitions”
t0“Citrus”
Claim · model-written summary
Oxytetracycline concentrations were lower in covered citrus leaves than directly treated leaves.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“OTC was detected in nearly all covered leaf samples in both repetitions, though at lower concentrations than in directly applied leaves”
t0“Citrus”
Claim · model-written summary
The authors conclude that leaf age does not strongly affect systemic oxytetracycline delivery in citrus.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“neither heat treatment nor leaf age strongly affect systemic OTC delivery”
t0“Citrus”
The same questions in other papers
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See all 11 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.