Abstract
Glyphosate-resistant Palmer amaranth is considered the most troublesome weed in agronomic crops in the Midsouth. The reliance on multiple herbicide mechanisms of action (MOA) and soil-residual herbicides has increased over the past several years due to the ever growing issue of herbicide-resistant weeds. Field experiments were conducted at several locations in Arkansas to determine the efficacy of fluridone on Palmer amaranth in glyphosate-resistant and glufosinate-resistant cotton herbicide programs and to determine the length of residual fluridone activity when applied preemergence (PRE). Fluridone has a unique MOA and is currently not registered as a stand-alone herbicide for use in cotton. In the length of residual experiment, when rainfall was adequate, fluridone applied PRE at rates greater than 224 g a.i. ha-1 provided > 90% Palmer amaranth control for 6 wk after application; however, effective season-long Palmer amaranth control was not achieved with any rate of fluridone alone. Fluridone alone applied 14-d preplant or PRE did not provide greater Palmer amaranth control than a standard herbicide application. When fluridone was integrated into a glufosinate-based herbicide program, PRE-applied fluridone at 224, 336, and 448 g ha-1 did not provide greater Palmer amaranth control than the standard herbicide program that included fluometuron. Based on these experiments, fluridone should not be applied as a stand-alone herbicide in cotton, nor will it reduce the number of POST applications needed for effective Palmer amaranth control in glufosinate-resistant cotton.
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Claims 6
Claim · model-written summary
Preemergence fluridone above 224 g active ingredient per hectare controlled more than 90% of Palmer amaranth for six weeks when rainfall was adequate.
- Taxon
- Cotton
Gossypium hirsutumt0 - Treatment
- fluridone applied PRE at rates greater than 224 g a.i. ha-1e0
- Interactor
- Palmer amaranthe0weed
- Outcome
- Palmer amaranth controle0
- Direction
- > 90%e0
- Value
- > 90%e0
- Qualifier
- when rainfall was adequatee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when rainfall was adequate, fluridone applied PRE at rates greater than 224 g a.i. ha-1 provided > 90% Palmer amaranth control for 6 wk after application”
t0“Cotton”
Claim · model-written summary
No tested rate of fluridone alone provided effective season-long Palmer amaranth control.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- fluridone alonee0
- Interactor
- Palmer amaranthe0weed
- Outcome
- season-long Palmer amaranth controle0
- Direction
- not achievede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“effective season-long Palmer amaranth control was not achieved with any rate of fluridone alone”
t0“Cotton”
Claim · model-written summary
Fluridone alone 14 days before planting or preemergence did not improve Palmer amaranth control over a standard herbicide application.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- Fluridone alone applied 14-d preplant or PREe0
- Interactor
- Palmer amaranthe0weed
- Outcome
- Palmer amaranth controle0
- Direction
- did not provide greatere0
- Comparator
- standard herbicide applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fluridone alone applied 14-d preplant or PRE did not provide greater Palmer amaranth control than a standard herbicide application.”
t0“Cotton”
Claim · model-written summary
In a glufosinate program, preemergence fluridone at 224, 336 or 448 g per hectare did not improve Palmer amaranth control over the fluometuron standard.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- PRE-applied fluridone at 224, 336, and 448 g ha-1e0
- Interactor
- Palmer amaranthe0weed
- Outcome
- Palmer amaranth controle0
- Direction
- did not provide greatere0
- Comparator
- standard herbicide program that included fluometurone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When fluridone was integrated into a glufosinate-based herbicide program, PRE-applied fluridone at 224, 336, and 448 g ha-1 did not provide greater Palmer amaranth control than the standard herbicide program that included fluometuron.”
t0“Cotton”
Claim · model-written summary
The authors advise against applying fluridone alone in cotton.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- fluridonee0
- Outcome
- fluridone should not be applied as a stand-alone herbicidee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fluridone should not be applied as a stand-alone herbicide in cotton”
Claim · model-written summary
Fluridone will not reduce the postemergence applications needed for Palmer amaranth control in glufosinate-resistant cotton.
- Taxon
- cottonGossypium hirsutume0
- Material
- glufosinate-resistant cottone0
- Treatment
- Fluridonet0
- Interactor
- Palmer amaranthe0weed
- Outcome
- number of POST applications needed for effective Palmer amaranth controle0
- Direction
- nor will it reducee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nor will it reduce the number of POST applications needed for effective Palmer amaranth control in glufosinate-resistant cotton.”
t0“Fluridone”
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56 papers in the same direction as this paper · 8 in the opposite direction · 3 reporting no difference from an alternative
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See all 68 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.