Abstract
Postemergence herbicide application timings for Palmer amaranth (Amaranthus palmeri) often coincide with foliar insecticide applications in cotton (Gossypium hirsutum). Combining multiple pesticides into a single application increases efficiency while reducing overall application cost. Multiple foliar insecticides are now labeled for dicamba tank-mixes. However, there is limited literature with respect to efficacy of dicamba on Palmer amaranth control when applied with insecticides. Field experiments were conducted from 2018 to 2020 to evaluate the effect of carrier volume and insecticide on the efficacy of dicamba (XtendiMaxTM with VaporGripTM) to control Palmer amaranth in XtendFlex™ cotton production systems. Dicamba was tank-mixed with acephate and dimethoate to four-leaf cotton and with thiamethoxam and sulfoxaflor just prior to bloom. Applications were made at carrier volumes of 140 and 280 L ha-1 and with a single spray droplet size of 800 µm. Palmer amaranth control 7 d after treatment was negatively impacted when applications included dimethoate; however, no corresponding response in seedcotton yield was observed relative to dicamba applied alone. However, when pooled over carrier volume, applications containing dicamba + acephate resulted in higher seedcotton yield than applications of dicamba + dimethoate. Additionally, pre-bloom applications of dicamba + thiamethoxam or sulfoxaflor increased Palmer amaranth efficacy relative to dicamba applied alone. Although certain insecticides are known to increase herbicidal crop response, the impact of insecticides on herbicide efficacy to control specific weed species is largely unknown. Therefore, we conclude that multiple dicamba + acephate, thiamethoxam, or sulfoxaflor tank-mixtures provide similar control of Palmer amaranth compared to dicamba alone.
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Claims 8
Claim · model-written summary
Dimethoate in the dicamba tank-mix reduced Palmer amaranth control 7 days after treatment compared with dicamba alone.
- Taxon
- cotton
Gossypium hirsutumt0 - Treatment
- dimethoatee0
- Interactor
- Palmer amaranthe0weed
- Outcome
- Palmer amaranth control 7 d after treatmente0
- Direction
- negatively impactede0
- Comparator
- dicamba applied alonee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Palmer amaranth control 7 d after treatment was negatively impacted when applications included dimethoate”
e1“however, no corresponding response in seedcotton yield was observed relative to dicamba applied alone”
t0“Dicamba-Tolerant Cotton (Gossypium hirsutum)”
Claim · model-written summary
Dimethoate in the dicamba tank-mix did not change seedcotton yield relative to dicamba alone.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- dimethoatee0
- Outcome
- seedcotton yielde1
- Direction
- no_changeinferrede1
- Comparator
- dicamba applied alonee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Palmer amaranth control 7 d after treatment was negatively impacted when applications included dimethoate”
e1“however, no corresponding response in seedcotton yield was observed relative to dicamba applied alone”
t0“Dicamba-Tolerant Cotton (Gossypium hirsutum)”
Claim · model-written summary
Dicamba plus acephate gave higher seedcotton yield than dicamba plus dimethoate when pooled over carrier volume.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- dicamba + acephatee2
- Outcome
- seedcotton yielde2
- Direction
- highere2
- Comparator
- dicamba + dimethoatee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“applications containing dicamba + acephate resulted in higher seedcotton yield than applications of dicamba + dimethoate”
t0“Dicamba-Tolerant Cotton (Gossypium hirsutum)”
Claim · model-written summary
Pre-bloom dicamba plus thiamethoxam increased Palmer amaranth efficacy relative to dicamba alone.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- thiamethoxame3
- Interactor
- Palmer amaranthe3weed
- Outcome
- Palmer amaranth efficacye3
- Direction
- increasede3
- Qualifier
- pre-bloome3
- Comparator
- dicamba applied alonee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“pre-bloom applications of dicamba + thiamethoxam or sulfoxaflor increased Palmer amaranth efficacy relative to dicamba applied alone”
t0“Dicamba-Tolerant Cotton (Gossypium hirsutum)”
Claim · model-written summary
Pre-bloom dicamba plus sulfoxaflor increased Palmer amaranth efficacy relative to dicamba alone.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- sulfoxaflore3
- Interactor
- Palmer amaranthe3weed
- Outcome
- Palmer amaranth efficacye3
- Direction
- increasede3
- Qualifier
- pre-bloome3
- Comparator
- dicamba applied alonee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“pre-bloom applications of dicamba + thiamethoxam or sulfoxaflor increased Palmer amaranth efficacy relative to dicamba applied alone”
t0“Dicamba-Tolerant Cotton (Gossypium hirsutum)”
Claim · model-written summary
Dicamba plus acephate gave similar Palmer amaranth control to dicamba alone.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- dicamba + acephatee4
- Interactor
- Palmer amaranthe4weed
- Outcome
- control of Palmer amaranthe4
- Direction
- no_changeinferrede4
- Comparator
- dicamba alonee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“multiple dicamba + acephate, thiamethoxam, or sulfoxaflor tank-mixtures provide similar control of Palmer amaranth compared to dicamba alone”
t0“Dicamba-Tolerant Cotton (Gossypium hirsutum)”
Claim · model-written summary
Dicamba plus thiamethoxam gave similar Palmer amaranth control to dicamba alone.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- thiamethoxame4
- Interactor
- Palmer amaranthe4weed
- Outcome
- control of Palmer amaranthe4
- Direction
- no_changeinferrede4
- Comparator
- dicamba alonee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“multiple dicamba + acephate, thiamethoxam, or sulfoxaflor tank-mixtures provide similar control of Palmer amaranth compared to dicamba alone”
t0“Dicamba-Tolerant Cotton (Gossypium hirsutum)”
Claim · model-written summary
Dicamba plus sulfoxaflor gave similar Palmer amaranth control to dicamba alone.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- sulfoxaflore4
- Interactor
- Palmer amaranthe4weed
- Outcome
- control of Palmer amaranthe4
- Direction
- no_changeinferrede4
- Comparator
- dicamba alonee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“multiple dicamba + acephate, thiamethoxam, or sulfoxaflor tank-mixtures provide similar control of Palmer amaranth compared to dicamba alone”
t0“Dicamba-Tolerant Cotton (Gossypium hirsutum)”
The same questions in other papers
acephate · control · Gossypium hirsutum (cotton)Positive and negative results
2 papers in the same direction as this paper · 2 reporting no difference from an alternative
- positive
- positive
- no effect
1 paper more in this group
See all 5 papers →dimethoate · control · Gossypium hirsutum (cotton)Positive and negative results
3 papers in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- no effect
2 papers more in this group
See all 6 papers →dimethoate · yield · Gossypium hirsutum (cotton)Positive and negative results
5 reporting no difference from an alternative
- positive
- positive
- positive
2 papers more in this group
See all 6 papers →dicamba · control · Gossypium hirsutum (cotton)Positive and negative results
9 reporting no difference from an alternative
- positive
- positive
- positive
6 papers more in this group
See all 10 papers →dicamba · yield · Gossypium hirsutum (cotton)Positive and negative results
3 papers in the same direction as this paper · 6 in the opposite direction
- negative
- negative
- negative
6 papers more in this group
See all 10 papers →sulfoxaflor · control · Gossypium hirsutum (cotton)Results agree
2 papers in the same direction as this paper
- positive
- positive
acephate · yield · Gossypium hirsutum (cotton)Results agree
3 papers in the same direction as this paper
- positive
- positive
- positive
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.