Abstract
Waterhemp is a competitive, summer annual, broadleaf weed that poses a considerable threat to Ontario grain farmers. Populations with multiple resistance to Group 2 (ALS-inhibitors), Group 5 (photosystem II inhibitors), and Group 9 (EPSPS inhibitors) herbicides have been confirmed in Ontario. If left uncontrolled, waterhemp competition can result in corn yield losses of up to 74%. The objective of this research was to evaluate preemergence (PRE) and postemergence (POST) herbicides for control of multiple-herbicide resistant (MR) waterhemp. Two field studies at two locations (Cottam and Walpole Island) were conducted in 2016 and 2017. Fifteen PRE and 12 POST herbicides were evaluated for waterhemp control, density, and aboveground biomass and corn yield. At 8 wk after application (WAA), S-metolachlor/mesotrione/atrazine (1393/139/524 g a.i. ha −1 ) and S-metolachlor/mesotrione/bicyclopyrone/atrazine (1259/140/35/588 g a.i. ha −1 ) applied PRE were the most efficacious, controlling MR waterhemp 87% and 91%, respectively. At 8 WAA, the most efficacious POST herbicides were mesotrione + atrazine and dicamba/atrazine, controlling MR waterhemp 92% and 87%, respectively. Reduced waterhemp interference with the PRE herbicides evaluated resulted in corn yield that was similar to the weed-free control.
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Claims 5
Claim · model-written summary
S-metolachlor/mesotrione/atrazine applied preemergence was among the most efficacious treatments, controlling multiple-resistant waterhemp 87% at 8 weeks after application.
- Taxon
- corn
Zea mays subsp. mayst0 - Treatment
- S-metolachlor/mesotrione/atrazinee1
- Interactor
- waterhempe2weed
- Outcome
- controlling MR waterhempe2
- Direction
- most efficaciouse2
- Value
- 87%e2
- Setting
- Ontariot0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“herbicides in corn in Ontario”
e1“S-metolachlor/mesotrione/atrazine”
e2“applied PRE were the most efficacious, controlling MR waterhemp 87% and 91%, respectively”
Claim · model-written summary
S-metolachlor/mesotrione/bicyclopyrone/atrazine applied preemergence was among the most efficacious treatments, controlling multiple-resistant waterhemp 91% at 8 weeks after application.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- S-metolachlor/mesotrione/bicyclopyrone/atrazinee3
- Interactor
- waterhempe2weed
- Outcome
- controlling MR waterhempe2
- Direction
- most efficaciouse2
- Value
- 91%e2
- Setting
- Ontariot0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“herbicides in corn in Ontario”
e3“S-metolachlor/mesotrione/bicyclopyrone/atrazine”
e2“applied PRE were the most efficacious, controlling MR waterhemp 87% and 91%, respectively”
Claim · model-written summary
Mesotrione + atrazine applied postemergence was among the most efficacious treatments, controlling multiple-resistant waterhemp 92% at 8 weeks after application.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- mesotrione + atrazinee4
- Interactor
- waterhempe4weed
- Outcome
- controlling MR waterhempe4
- Direction
- most efficaciouse4
- Value
- 92%e4
- Setting
- Ontariot0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“herbicides in corn in Ontario”
e4“the most efficacious POST herbicides were mesotrione + atrazine and dicamba/atrazine, controlling MR waterhemp 92% and 87%, respectively”
Claim · model-written summary
Dicamba/atrazine applied postemergence was among the most efficacious treatments, controlling multiple-resistant waterhemp 87% at 8 weeks after application.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- dicamba/atrazinee4
- Interactor
- waterhempe4weed
- Outcome
- controlling MR waterhempe4
- Direction
- most efficaciouse4
- Value
- 87%e4
- Setting
- Ontariot0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“herbicides in corn in Ontario”
e4“the most efficacious POST herbicides were mesotrione + atrazine and dicamba/atrazine, controlling MR waterhemp 92% and 87%, respectively”
Claim · model-written summary
Preemergence herbicides that reduced waterhemp interference gave corn yield similar to the weed-free control.
- Taxon
- cornZea mays subsp. mayse5
- Treatment
- PRE herbicidese5
- Interactor
- waterhempe5weed
- Outcome
- corn yielde5
- Direction
- similare5
- Comparator
- weed-free controle5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“herbicides in corn in Ontario”
e5“Reduced waterhemp interference with the PRE herbicides evaluated resulted in corn yield that was similar to the weed-free control”
The same questions in other papers
mesotrione · disease · Zea mays (maize)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- negative
- negative
- positive
atrazine · disease · Zea mays (maize)Positive and negative results
4 papers in the same direction as this paper · 5 in the opposite direction
- no effect
- no effect
- negative
6 papers more in this group
See all 10 papers →dicamba · disease · Zea mays (maize)Results agree
1 paper in the same direction as this paper
- positive
herbicide · yield · Zea mays (maize)Positive and negative results
499 papers in the same direction as this paper · 127 in the opposite direction · 24 reporting no difference from an alternative
- no effect
- negative
- negative
647 papers more in this group
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.