Abstract
Field experiments were conducted at two locations in 2003 and 2004 to determine dark tobacco tolerance and weed control from postemergence over-the-top (POT) and postemergence-directed (PD) applications of trifloxysulfuron and halosulfuron. Trifloxysulfuron was applied at 3.6 or 5.3 g ai/ha and halosulfuron was applied at 36 or 53 g ai/ha. Trifloxysulfuron POT injured ‘Narrowleaf Madole’ dark tobacco 16 to 33% and halosulfuron POT caused 32 to 33% injury at 1 wk after treatment (WAT). Tobacco plant height at 1 WAT with POT applications was also reduced by up to 31% at one of two locations. Tobacco injury from POT applications had dissipated to 6 to 12% by 4 WAT. Despite extensive early-season injury, most POT herbicide applications did not significantly reduce tobacco yield, mean grade index, and gross revenue compared to tobacco that only received pretransplant applications of sulfentrazone plus clomazone. Dark tobacco was much more tolerant to PD applications of either herbicide, with no more than 4% injury observed at 1 WAT. Neither herbicide controlled horsenettle more than 57% at either application rate or method. Although trifloxysulfuron and halosulfuron could contribute to tobacco weed control programs by providing postemergence control of several common weed species, PD applications would be the only acceptable method of application due to excessive injury observed from POT applications of these herbicides.
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Claims 8
Claim · model-written summary
Over-the-top trifloxysulfuron injured Narrowleaf Madole tobacco by 16 to 33% at one week.
- Taxon
- dark tobaccoe0
- Material
- ‘Narrowleaf Madole’e0
- Treatment
- Trifloxysulfuron POTe0
- Outcome
- injurede0
- Value
- 16 to 33%e0
Not reportedComparatorDirection
Verbatim
e0“Trifloxysulfuron POT injured ‘Narrowleaf Madole’ dark tobacco 16 to 33% and halosulfuron POT caused 32 to 33% injury at 1 wk after treatment (WAT)”
Claim · model-written summary
Over-the-top halosulfuron caused 32 to 33% tobacco injury at one week.
Not reportedComparatorDirection
Verbatim
e0“Trifloxysulfuron POT injured ‘Narrowleaf Madole’ dark tobacco 16 to 33% and halosulfuron POT caused 32 to 33% injury at 1 wk after treatment (WAT)”
Claim · model-written summary
Over-the-top applications reduced tobacco height by up to 31% at one location.
- Taxon
- Tobacco
Nicotiana tabacume0 - Treatment
- POT applicationse0
- Outcome
- plant heighte0
- Direction
- reducede0
- Value
- up to 31%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tobacco plant height at 1 WAT with POT applications was also reduced by up to 31% at one of two locations”
Claim · model-written summary
Over-the-top application injury subsided to 6 to 12% by four weeks.
- Taxon
- TobaccoNicotiana tabacume0
- Treatment
- POT applicationse0
- Outcome
- injurye0
- Direction
- dissipatede0
- Value
- 6 to 12%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tobacco injury from POT applications had dissipated to 6 to 12% by 4 WAT”
Claim · model-written summary
Most over-the-top applications did not significantly reduce yield, grade index or gross revenue versus pretransplant herbicides.
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- POT herbicide applicationse0
- Outcome
- tobacco yield, mean grade index, and gross revenuee0
- Direction
- did not significantly reducee0
- Comparator
- tobacco that only received pretransplant applications of sulfentrazone plus clomazonee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“most POT herbicide applications did not significantly reduce tobacco yield, mean grade index, and gross revenue compared to tobacco that only received pretransplant applications of sulfentrazone plus clomazone”
Claim · model-written summary
Directed applications caused no more than 4% injury at one week.
- Taxon
- Dark tobaccoe0
- Treatment
- PD applications of either herbicidee0
- Outcome
- injurye0
- Value
- no more than 4%e0
Not reportedComparatorDirection
Verbatim
e0“Dark tobacco was much more tolerant to PD applications of either herbicide, with no more than 4% injury observed at 1 WAT”
Claim · model-written summary
Neither herbicide controlled horsenettle by more than 57%.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- Neither herbicidee0
- Interactor
- horsenettlee0weed
- Outcome
- controlled horsenettlee0
- Value
- 57%e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Neither herbicide controlled horsenettle more than 57% at either application rate or method”
t0“Tobacco”
Claim · model-written summary
The authors recommend directed application because over-the-top treatment caused excessive injury.
- Taxon
- TobaccoNicotiana tabacumt0
- Outcome
- PD applications would be the only acceptable method of applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PD applications would be the only acceptable method of application due to excessive injury observed from POT applications of these herbicides”
t0“Tobacco”
The same questions in other papers
herbicide · yield · Nicotiana tabacum (tobacco)Positive and negative results
7 papers in the same direction as this paper · 1 reporting no difference from an alternative
- no effect
- negative
- positive
5 papers more in this group
See all 9 papers →herbicide · growth · Nicotiana tabacum (tobacco)Results agree
2 papers in the same direction as this paper
- negative
- no effect
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.