Abstract
Palmer amaranth is a very problematic weed that has evolved resistance to several classes of herbicides, including 5-enolypyruvylshikimate-3-phosate synthase–inhibiting herbicides and photosystem II–inhibiting herbicides. In recent years, corn producers have had difficulty controlling large Palmer amaranth (> 20 cm) in corn > 30 cm whether it be due to environmental conditions or management failures. Palmer amaranth management in corn this tall is made even more challenging because atrazine is not labeled POST in corn > 30 cm tall. Therefore, a study was conducted in 2013 and 2014 in Jackson, TN, to evaluate herbicide programs in corn > 30 cm tall for the control of glyphosate-resistant Palmer amaranth > 20 cm tall. Treatments consisted of herbicides applied alone and in mixtures with dicamba plus diflufenzopyr. Herbicides were applied POST to corn between the V5 and V6 growth stages. Dicamba plus diflufenzopyr 28 d after application controlled Palmer amaranth > 87%. The herbicides alone or in combinations applied as tank mixtures did not improve control (< 76%) over dicamba plus diflufenzopyr alone. There were no grain-yield differences among treatments because of Palmer amaranth control. This was likely due to the Palmer amaranth competition having already affected corn yield by the V5 to V6 corn growth stages.
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Claims 4
Claim · model-written summary
Dicamba plus diflufenzopyr controlled more than 87 percent of Palmer amaranth at 28 days.
- Taxon
- Corn
Zea mays subsp. mayst0 - Treatment
- Dicamba plus diflufenzopyre0
- Interactor
- Palmer amaranthe0weed
- Outcome
- Palmer amaranthe0
- Direction
- controllede0
- Value
- > 87%e0
- Qualifier
- 28 d after applicatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dicamba plus diflufenzopyr 28 d after application controlled Palmer amaranth > 87%”
t0“Corn”
Claim · model-written summary
Other herbicides alone or tank mixed did not improve Palmer amaranth control over dicamba plus diflufenzopyr, with less than 76 percent control.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- herbicides alone or in combinations applied as tank mixturese0
- Interactor
- Palmer Amarantht0weed
- Outcome
- controle0
- Direction
- did not improvee0
- Value
- < 76%e0
- Comparator
- dicamba plus diflufenzopyr alonee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The herbicides alone or in combinations applied as tank mixtures did not improve control (< 76%) over dicamba plus diflufenzopyr alone”
t0“Palmer Amaranth (Amaranthus palmeri) in Corn”
Claim · model-written summary
Corn grain yield did not differ among herbicide treatments.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- treatmentse0
- Interactor
- Palmer amaranthe0weed
- Outcome
- grain-yielde0
- Direction
- no grain-yield differencese0
- Comparator
- among treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were no grain-yield differences among treatments because of Palmer amaranth control”
t0“Corn”
Claim · model-written summary
The authors suggest Palmer amaranth competition had already affected corn yield by V5 to V6.
- Taxon
- cornZea mays subsp. mayse0
- Organ / stage
- V5 to V6 corn growth stagese0
- Interactor
- Palmer amaranthe0weed
- Outcome
- corn yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This was likely due to the Palmer amaranth competition having already affected corn yield by the V5 to V6 corn growth stages”
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