Abstract
For Florida citrus, pesticides, nutritionals and growth regulators are often sprayed together in tank mixes in order to reduce sprayer use when timings for efficacy are relatively coincident. Many individual spray components are marginally phytotoxic and can result in spray burns when used together or if applied with adjuvants that increase absorption. The toxicity level of many standard spray materials is unknown and new products are not routinely tested for phytotoxicity in citrus, particularly as tank mixes with other pesticides or nutritionals. Three test methods were developed to allow spray chemical phytotoxicity testing using cell cultures, peel disks and whole fruit. Cell suspension cultures initiated from 'nucellar derived' embryonic callus of 'Hamlin' sweet orange and 2) peel disks of orange or grapefruit were grown in culture and exposed to media incorporated test chemicals. Reduced weight gain (Method 1) or color changes and callus growth reduction (Method 2) were used to evaluate phytotoxicity. Dilute sprays and droplet applications to on-tree fruit (Method 3) were used to evaluate individual and combinations of chemicals with and without spray adjuvants. The three tests effectively determined thresholds for phytotoxicity and will be useful for testing new citrus production chemicals. These were preliminary evaluations and could be refined for statistical application. Chemicals tested and found to have some level of phytotoxicity by these methods included Aliette, Morestan, Pro-Gibb with 2,4-D, citric, phosphorus, and phosphoric acids, and some additional pesticides in combination with urea. Two herbicide grade adjuvants tested (Herbex and Induce) increased phytotoxicity in on-tree tests. Salty water often reduced the influence of a surfactant. Acidity, in itself, was phytotoxic to the peel of the fruit indicating buffering is important to minimize spray burn.
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Claims 7
Claim · model-written summary
Three tests determined citrus phytotoxicity thresholds.
- Outcome
- thresholds for phytotoxicitye0
Not reportedComparatorValue
Verbatim
e0“The three tests effectively determined thresholds for phytotoxicity and will be useful for testing new citrus production chemicals.”
Claim · model-written summary
Aliette, Morestan, Pro-Gibb with 2,4-D, citric, phosphorus and phosphoric acids showed some phytotoxicity.
- Treatment
- Aliette, Morestan, Pro-Gibb with 2,4-D, citric, phosphorus, and phosphoric acidse0
- Outcome
- phytotoxicitye0
Not reportedTaxon
Verbatim
e0“Chemicals tested and found to have some level of phytotoxicity by these methods included Aliette, Morestan, Pro-Gibb with 2,4-D, citric, phosphorus, and phosphoric acids, and some additional pesticides in combination with urea.”
Claim · model-written summary
Additional pesticides combined with urea showed some phytotoxicity.
Not reportedTaxon
Verbatim
e0“some additional pesticides in combination with urea”
e1“Chemicals tested and found to have some level of phytotoxicity”
Claim · model-written summary
Herbex and Induce increased phytotoxicity in on-tree citrus tests.
CitrusNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two herbicide grade adjuvants tested (Herbex and Induce) increased phytotoxicity in on-tree tests.”
t0“CITRUS”
Claim · model-written summary
Salty water often reduced surfactant influence.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salty water often reduced the influence of a surfactant.”
t0“CITRUS”
Claim · model-written summary
Acidity itself was phytotoxic to citrus fruit peel.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Acidity, in itself, was phytotoxic to the peel of the fruit indicating buffering is important to minimize spray burn.”
t0“CITRUS”
Claim · model-written summary
The authors suggest buffering to minimize citrus spray burn.
- Outcome
- minimize spray burne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“buffering is important to minimize spray burn”
t0“CITRUS”
The same questions in other papers
salinity · molecular: metabolites · CitrusResults agree
5 papers in the same direction as this paper
- no effect
- no effect
- negative
2 papers more in this group
See all 6 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.