Abstract
Core Ideas Corn hybrid sensitivity to ALS herbicides is an issue. Herbicide safeners may not provide complete crop safety. Growers who want to use safened ALS herbicides on sensitive corn hybrids must be aware of yield loss potential. Research was conducted in 2014 and 2015 to determine if two common commercial acetolactate synthase (ALS) inhibitor herbicide formulations, that contain the crop safener isoxadifen, could be used on field corn ( Zea mays L.) hybrids with reported ALS sensitivity. Two ALS‐sensitive field corn hybrids (DEKALB DKC 62‐08 and DKC 64‐69) were treated 18 to 21 days after planting with nicosulfuron + rimsulfuron + isoxadifen or thiencarbazone + tembotrione + isoxadifen at 1× and 2× labeled rates. No interactions were observed between herbicide treatment and field corn hybrid. When averaged over herbicide treatment, DKC 62‐08 produced less aboveground biomass and was shorter in height than DKC 64‐69. However, no difference in grain yield between hybrids was observed. When averaged over corn hybrid, only the 2× rate of tembotrione + thiencarbazone methyl + isoxadifen caused a significant reduction (19%) in aboveground biomass. Nicosulfuron + rimsulfuron + isoxadifen and tembotrione + thiencarbazone + isoxadifen, at both 1× and 2× rates, reduced plant height up to 3 inches 26 days after treatment (DAT). However, only the 2× rates of these safened herbicides caused significant height reductions 62 DAT. Both herbicide formulations at 1× and 2× labeled rates caused corn yield losses of 11 to 16 bu/acre. These data suggest that these particular commercial herbicide formulations can cause crop injury and subsequent yield loss when used on ALS‐sensitive field corn hybrids.
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Claims 8
Claim · model-written summary
DKC 62‐08 produced less aboveground biomass than DKC 64‐69 when averaged over herbicide treatment.
Verbatim
e0“Two ALS‐sensitive field corn hybrids (DEKALB DKC 62‐08 and DKC 64‐69)”
e1“When averaged over herbicide treatment, DKC 62‐08 produced less aboveground biomass and was shorter in height than DKC 64‐69”
Claim · model-written summary
DKC 62‐08 was shorter in height than DKC 64‐69 when averaged over herbicide treatment.
Verbatim
e0“Two ALS‐sensitive field corn hybrids (DEKALB DKC 62‐08 and DKC 64‐69)”
e1“When averaged over herbicide treatment, DKC 62‐08 produced less aboveground biomass and was shorter in height than DKC 64‐69”
Claim · model-written summary
No difference in grain yield was found between the field corn hybrids.
Verbatim
e0“Two ALS‐sensitive field corn hybrids (DEKALB DKC 62‐08 and DKC 64‐69)”
e1“However, no difference in grain yield between hybrids was observed”
Claim · model-written summary
The 2× rate of tembotrione + thiencarbazone methyl + isoxadifen significantly reduced aboveground biomass of field corn by 19%.
- Taxon
- field corne0
- Treatment
- 2× rate of tembotrione + thiencarbazone methyl + isoxadifene1
- Outcome
- aboveground biomasse1
- Direction
- reductione1
- Value
- 19%e1
Not reportedComparator
Verbatim
e0“Two ALS‐sensitive field corn hybrids (DEKALB DKC 62‐08 and DKC 64‐69)”
e1“When averaged over corn hybrid, only the 2× rate of tembotrione + thiencarbazone methyl + isoxadifen caused a significant reduction (19%) in aboveground biomass”
Claim · model-written summary
Nicosulfuron + rimsulfuron + isoxadifen and tembotrione + thiencarbazone + isoxadifen at 1× and 2× rates reduced plant height of field corn up to 3 inches at 26 DAT.
- Taxon
- field corne0
- Treatment
- Nicosulfuron + rimsulfuron + isoxadifen and tembotrione + thiencarbazone + isoxadifene1
- Outcome
- plant heighte1
- Direction
- reducede1
- Value
- 3 inchese1
- Qualifier
- 26 days after treatment (DAT)e1
Not reportedComparator
Verbatim
e0“Two ALS‐sensitive field corn hybrids (DEKALB DKC 62‐08 and DKC 64‐69)”
e1“Nicosulfuron + rimsulfuron + isoxadifen and tembotrione + thiencarbazone + isoxadifen, at both 1× and 2× rates, reduced plant height up to 3 inches 26 days after treatment (DAT)”
Claim · model-written summary
Only the 2× rates of the safened herbicides significantly reduced field corn height at 62 DAT.
- Taxon
- field corne0
- Treatment
- 2× rates of these safened herbicidese1
- Outcome
- heighte1
- Direction
- reductionse1
- Qualifier
- 62 DATe1
Not reportedComparator
Verbatim
e0“Two ALS‐sensitive field corn hybrids (DEKALB DKC 62‐08 and DKC 64‐69)”
e1“However, only the 2× rates of these safened herbicides caused significant height reductions 62 DAT”
Claim · model-written summary
Both herbicide formulations at 1× and 2× labeled rates caused field corn yield losses of 11 to 16 bu/acre.
- Taxon
- field corne0
- Treatment
- herbicide formulations at 1× and 2× labeled ratese1
- Outcome
- corn yielde1
- Direction
- lossese1
- Value
- 11 to 16 bu/acree1
Not reportedComparator
Verbatim
e0“Two ALS‐sensitive field corn hybrids (DEKALB DKC 62‐08 and DKC 64‐69)”
e1“Both herbicide formulations at 1× and 2× labeled rates caused corn yield losses of 11 to 16 bu/acre”
Claim · model-written summary
No interaction was observed between herbicide treatment and field corn hybrid.
Verbatim
e0“Two ALS‐sensitive field corn hybrids (DEKALB DKC 62‐08 and DKC 64‐69)”
e1“No interactions were observed between herbicide treatment and field corn hybrid”
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