Abstract
Abstract Palmer amaranth, a dioecious summer annual weed species, is the most troublesome weed in agronomic crop production systems in the United States. Palmer amaranth resistant to photosystem (PS) II- and 4-hydroxyphenylpyruvate dioxygenase (HPPD) inhibitors is of particular concern in south central Nebraska. The objectives of this study were to determine the effect of PRE followed by POST herbicide programs on PS II- and HPPD-inhibitor-resistant Palmer amaranth control, crop yield, and net economic return in conventional corn. A field study was conducted in 2014, 2015, and 2016 in a grower’s field infested with PS II- and HPPD-inhibitor-resistant Palmer amaranth near Shickley in Fillmore County, Nebraska. A contrast analysis suggested that mesotrione+ S -metolachlor+atrazine applied PRE provided 83% Palmer amaranth control at 21 d after application compared to 78 and 72% control with pyroxasulfone+fluthiacet-ethyl+atrazine and saflufenacil+dimethenamid-P, respectively. Most of the PRE followed by POST herbicide programs provided ≥85% Palmer amaranth control. Based on contrast analysis, POST application of dicamba+diflufenzopyr provided 93% Palmer amaranth control compared to 87, 79, and 42% control with dicamba, dicamba+halosulfuron, and acetochlor, respectively, at 28 d after POST. All PRE followed by POST herbicide programs, aside from mesotrione+ S -metolachlor+atrazine followed by acetochlor (2,530 to 7,809 kg ha −1 ), provided 9,550 to 10,500 kg ha −1 corn yield compared with 2,713 to 6,110 kg ha −1 from nontreated control. Similarly, PRE followed by POST herbicide programs, except for mesotrione+ S -metolachlor+atrazine followed by acetochlor ($191 and $897 ha −1 ), provided similar net return of $427 to $707 ha −1 and $1,127 to $1,727 ha −1 in 2014 and 2015-16, respectively. It is concluded that herbicide programs based on multiple sites of action are available for control of PS II- and HPPD-inhibitor-resistant Palmer amaranth in conventional corn.
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Claims 9
Claim · model-written summary
PRE mesotrione combination gave 83% Palmer amaranth control at 21 days.
- Taxon
- corn
Zea mays subsp. mayse1 - Treatment
- mesotrione+ S -metolachlor+atrazine applied PREe0
- Interactor
- Palmer amaranthe2weed
- Outcome
- Palmer amaranth controle0
- Value
- 83%e0
- Qualifier
- 21 d after applicatione0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“mesotrione+ S -metolachlor+atrazine applied PRE provided 83% Palmer amaranth control at 21 d after application”
e1“crop yield, and net economic return in conventional corn.”
e2“Palmer amaranth, a dioecious summer annual weed species”
Claim · model-written summary
Most PRE followed by POST programs controlled Palmer amaranth by at least 85%.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- PRE followed by POST herbicide programse0
- Interactor
- Palmer amaranthe0weed
- Outcome
- Palmer amaranth controle0
- Value
- ≥85%e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Most of the PRE followed by POST herbicide programs provided ≥85% Palmer amaranth control”
e1“crop yield, and net economic return in conventional corn.”
Claim · model-written summary
POST dicamba plus diflufenzopyr gave 93% Palmer amaranth control at 28 days.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- dicamba+diflufenzopyre0
- Interactor
- Palmer amaranthe0weed
- Outcome
- Palmer amaranth controle0
- Value
- 93%e0
- Qualifier
- at 28 d after POSTe2
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“POST application of dicamba+diflufenzopyr provided 93% Palmer amaranth control”
e1“crop yield, and net economic return in conventional corn.”
e2“at 28 d after POST”
Claim · model-written summary
Most PRE followed by POST programs yielded 9,550 to 10,500 kg per hectare of corn versus 2,713 to 6,110 for nontreated controls.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- PRE followed by POST herbicide programse0
- Outcome
- corn yielde0
- Value
- 9,550 to 10,500 kg ha −1e0
- Qualifier
- 2,713 to 6,110 kg ha −1e0
- Comparator
- nontreated controle0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All PRE followed by POST herbicide programs, aside from mesotrione+ S -metolachlor+atrazine followed by acetochlor (2,530 to 7,809 kg ha −1 ), provided 9,550 to 10,500 kg ha −1 corn yield compared with 2,713 to 6,110 kg ha −1 from nontreated control”
Claim · model-written summary
The mesotrione PRE and acetochlor POST exception yielded 2,530 to 7,809 kg per hectare.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- mesotrione+ S -metolachlor+atrazine followed by acetochlore0
- Outcome
- corn yielde1
- Value
- 2,530 to 7,809 kg ha −1e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“mesotrione+ S -metolachlor+atrazine followed by acetochlor (2,530 to 7,809 kg ha −1 )”
e1“corn yield”
Claim · model-written summary
Other herbicide programs returned $427 to $707 per hectare in 2014.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- PRE followed by POST herbicide programse0
- Outcome
- net returne0
- Direction
- similare0
- Value
- $427 to $707 ha −1e0
- Qualifier
- 2014e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PRE followed by POST herbicide programs, except for mesotrione+ S -metolachlor+atrazine followed by acetochlor ($191 and $897 ha −1 ), provided similar net return of $427 to $707 ha −1 and $1,127 to $1,727 ha −1 in 2014 and 2015-16, respectively”
e1“crop yield, and net economic return in conventional corn.”
Claim · model-written summary
Other herbicide programs returned $1,127 to $1,727 per hectare in 2015–16.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- PRE followed by POST herbicide programse0
- Outcome
- net returne0
- Direction
- similare0
- Value
- $1,127 to $1,727 ha −1e0
- Qualifier
- 2015-16e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PRE followed by POST herbicide programs, except for mesotrione+ S -metolachlor+atrazine followed by acetochlor ($191 and $897 ha −1 ), provided similar net return of $427 to $707 ha −1 and $1,127 to $1,727 ha −1 in 2014 and 2015-16, respectively”
e1“crop yield, and net economic return in conventional corn.”
Claim · model-written summary
The mesotrione and acetochlor program returned $191 and $897 per hectare across the reported years.
- Taxon
- cornZea mays subsp. mayse2
- Treatment
- mesotrione+ S -metolachlor+atrazine followed by acetochlore0
- Outcome
- net returne1
- Value
- $191 and $897 ha −1e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“mesotrione+ S -metolachlor+atrazine followed by acetochlor ($191 and $897 ha −1 )”
e1“net return”
e2“crop yield, and net economic return in conventional corn.”
Claim · model-written summary
The authors conclude that multiple site herbicide programs are available to control resistant Palmer amaranth in corn.
- Taxon
- cornZea mays subsp. mayse0
- Interactor
- Palmer amaranthe0weed
- Outcome
- herbicide programs based on multiple sites of actione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“herbicide programs based on multiple sites of action are available for control of PS II- and HPPD-inhibitor-resistant Palmer amaranth in conventional corn”
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See all 651 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.