Abstract
Field experiments were conducted in 1999 and 2000 to determine the influence of mesotrione postemergence application rate, application timing, and addition of atrazine on corn injury, weed control, and corn grain yield. Corn injury in the form of leaf bleaching ranged from 0 to 15% at 7 d after treatment (DAT). In general, most of the bleaching injury rapidly dissipated with slight (≤ 8%) to no corn injury observed at 28 DAT. Control of common cocklebur with mesotrione at 14 DAT ranged from 79 to 98% for all treatments over both years. Applying mesotrione at 140 g/ha, at the early postemergence (EPOST) timing, or in combination with atrazine provided the greatest control of common cocklebur at 14 DAT. Application rate of mesotrione was the only factor that was significant in both years for control of common cocklebur later in the season at 56 DAT. Control of ivyleaf morningglory with mesostrione at 14 DAT ranged from 60 to 90% for all treatments in both years. Control of ivyleaf morningglory at 14 DAT was enhanced by the addition of atrazine to mesotrione. Control of ivyleaf morningglory at 56 DAT was greater with mid-postemergence and late postemergence than with EPOST applications, and was generally enhanced by the addition of atrazine. Yellow nutsedge control with mesotrione was inconsistent, ranging from 40 to 87% at 14 DAT for all treatments over both years. The addition of atrazine to mesotrione increased yellow nutsedge control from 47 to 87% at 14 DAT in 2000. Increasing the rate of mesotrione from 70 to 140 g/ha, as well as the addition of atrazine, improved control of yellow nutsedge at 56 DAT. Corn grain yield was not affected by corn injury or weed control as there were no significant differences in grain yield between herbicide-treated plots and handweeded plots.Nomenclature: Atrazine; mesotrione; common cocklebur, Xanthium strumarium L. #3 XANST; ivyleaf morningglory, Ipomoea hederacea L. Jacq. # IPOHE; yellow nutsedge, Cyperus esculentus L. # CYPES; corn Zea mays L. ‘DK 592SR’, ‘DK 683SR’.Abbreviations: COC, crop-oil concentrate; DAT, days after treatment; EPOST, early postemergence; MPOST, mid-postemergence; LPOST, late postemergence; PRE, preemergence; UAN, 28% urea ammonium nitrate.
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Claims 16
Claim · model-written summary
Corn leaf bleaching injury ranged from 0 to 15% seven days after treatment.
- Taxon
- Corn
Zea mays subsp. mayse0 - Outcome
- Corn injury in the form of leaf bleachinge0
- Value
- 0 to 15%e0
- Qualifier
- 7 d after treatment (DAT)e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Corn injury in the form of leaf bleaching ranged from 0 to 15% at 7 d after treatment (DAT).”
Claim · model-written summary
Corn bleaching injury mostly dissipated by 28 days, when injury was slight or absent.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- bleaching injurye0
- Direction
- rapidly dissipatede0
- Value
- ≤ 8%e0
- Qualifier
- 28 DATe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“most of the bleaching injury rapidly dissipated with slight (≤ 8%) to no corn injury observed at 28 DAT.”
t0“Corn”
Claim · model-written summary
Common cocklebur control by mesotrione was 79 to 98% at 14 days across treatments and years.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- mesotrionee0
- Interactor
- common cocklebure0weed
- Outcome
- Control of common cocklebure0
- Value
- 79 to 98%e0
- Qualifier
- 14 DATe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Control of common cocklebur with mesotrione at 14 DAT ranged from 79 to 98% for all treatments over both years.”
t0“Corn”
Claim · model-written summary
Mesotrione at 140 g/ha gave the greatest common cocklebur control at 14 days.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- mesotrione at 140 g/hae0
- Interactor
- common cocklebure0weed
- Outcome
- control of common cocklebure0
- Direction
- greateste0
- Qualifier
- 14 DATe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Applying mesotrione at 140 g/ha, at the early postemergence (EPOST) timing, or in combination with atrazine provided the greatest control of common cocklebur at 14 DAT.”
t0“Corn”
Claim · model-written summary
Early postemergence mesotrione gave the greatest common cocklebur control at 14 days.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- early postemergence (EPOST) timinge0
- Interactor
- common cocklebure0weed
- Outcome
- control of common cocklebure0
- Direction
- greateste0
- Qualifier
- 14 DATe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Applying mesotrione at 140 g/ha, at the early postemergence (EPOST) timing, or in combination with atrazine provided the greatest control of common cocklebur at 14 DAT.”
t0“Corn”
Claim · model-written summary
Combining mesotrione with atrazine gave the greatest common cocklebur control at 14 days.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- in combination with atrazinee0
- Interactor
- common cocklebure0weed
- Outcome
- control of common cocklebure0
- Direction
- greateste0
- Qualifier
- 14 DATe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Applying mesotrione at 140 g/ha, at the early postemergence (EPOST) timing, or in combination with atrazine provided the greatest control of common cocklebur at 14 DAT.”
t0“Corn”
Claim · model-written summary
Mesotrione rate was the only factor significant for common cocklebur control at 56 days in both years.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- Application rate of mesotrionee0
- Interactor
- common cocklebure0weed
- Outcome
- control of common cocklebure0
- Qualifier
- 56 DATe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application rate of mesotrione was the only factor that was significant in both years for control of common cocklebur later in the season at 56 DAT.”
t0“Corn”
Claim · model-written summary
Ivyleaf morningglory control with mesotrione ranged from 60 to 90% at 14 days.
- Taxon
- CornZea mays subsp. mayst0
- Interactor
- ivyleaf morningglory
Ipomoea hederaceae0weed - Outcome
- Control of ivyleaf morningglorye0
- Value
- 60 to 90%e0
- Qualifier
- 14 DATe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Control of ivyleaf morningglory with mesostrione at 14 DAT ranged from 60 to 90% for all treatments in both years.”
t0“Corn”
Claim · model-written summary
Adding atrazine to mesotrione enhanced ivyleaf morningglory control at 14 days.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- addition of atrazine to mesotrionee0
- Interactor
- ivyleaf morninggloryIpomoea hederaceae0weed
- Outcome
- Control of ivyleaf morningglorye0
- Direction
- enhancede0
- Qualifier
- 14 DATe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Control of ivyleaf morningglory at 14 DAT was enhanced by the addition of atrazine to mesotrione.”
t0“Corn”
Claim · model-written summary
Mid-postemergence and late postemergence applications controlled ivyleaf morningglory better than early applications at 56 days.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- mid-postemergence and late postemergencee0
- Interactor
- ivyleaf morninggloryIpomoea hederaceae0weed
- Outcome
- Control of ivyleaf morningglorye0
- Direction
- greatere0
- Qualifier
- 56 DATe0
- Comparator
- EPOST applicationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Control of ivyleaf morningglory at 56 DAT was greater with mid-postemergence and late postemergence than with EPOST applications”
t0“Corn”
Claim · model-written summary
Atrazine generally enhanced ivyleaf morningglory control at 56 days.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- addition of atrazinee0
- Interactor
- ivyleaf morninggloryIpomoea hederaceae0weed
- Outcome
- Control of ivyleaf morningglorye0
- Direction
- enhancede0
- Qualifier
- 56 DATe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Control of ivyleaf morningglory at 56 DAT was greater with mid-postemergence and late postemergence than with EPOST applications, and was generally enhanced by the addition of atrazine.”
t0“Corn”
Claim · model-written summary
Yellow nutsedge control with mesotrione was inconsistent, ranging from 40 to 87% at 14 days.
- Taxon
- CornZea mays subsp. mayst0
- Interactor
- Yellow nutsedgee0weed
- Outcome
- Yellow nutsedge controle0
- Value
- 40 to 87%e0
- Qualifier
- 14 DATe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yellow nutsedge control with mesotrione was inconsistent, ranging from 40 to 87% at 14 DAT for all treatments over both years.”
t0“Corn”
Claim · model-written summary
Adding atrazine to mesotrione raised yellow nutsedge control from 47 to 87% at 14 days in 2000.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- addition of atrazine to mesotrionee0
- Interactor
- yellow nutsedgee0weed
- Outcome
- yellow nutsedge controle0
- Direction
- increasede0
- Value
- 87%e0
- Qualifier
- from 47 to 87% at 14 DAT in 2000e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The addition of atrazine to mesotrione increased yellow nutsedge control from 47 to 87% at 14 DAT in 2000.”
t0“Corn”
Claim · model-written summary
Increasing mesotrione from 70 to 140 g/ha improved yellow nutsedge control at 56 days.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- mesotrione from 70 to 140 g/hae0
- Interactor
- yellow nutsedgee0weed
- Outcome
- control of yellow nutsedgee0
- Direction
- improvede0
- Qualifier
- 56 DATe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing the rate of mesotrione from 70 to 140 g/ha, as well as the addition of atrazine, improved control of yellow nutsedge at 56 DAT.”
t0“Corn”
Claim · model-written summary
Adding atrazine improved yellow nutsedge control at 56 days.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- addition of atrazinee0
- Interactor
- yellow nutsedgee0weed
- Outcome
- control of yellow nutsedgee0
- Direction
- improvede0
- Qualifier
- 56 DATe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing the rate of mesotrione from 70 to 140 g/ha, as well as the addition of atrazine, improved control of yellow nutsedge at 56 DAT.”
t0“Corn”
Claim · model-written summary
Herbicide-treated plots had no significant corn grain yield difference from handweeded plots.
- Taxon
- CornZea mays subsp. mayse0
- Treatment
- herbicide-treated plotse0
- Outcome
- grain yielde0
- Direction
- no significant differencese0
- Comparator
- handweeded plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Corn grain yield was not affected by corn injury or weed control as there were no significant differences in grain yield between herbicide-treated plots and handweeded plots.”
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