Abstract
Populations of glyphosate-resistant (GR) Canada fleabane and GR giant ragweed can be found in several locations in southwestern Ontario. While these species can be managed individually, a scenario has developed where both species are present in GR soybean. Ten separate field experiments (five with Canada fleabane and five with giant ragweed) were conducted over a 2-yr period (2013–2014) in soybean to evaluate preplant (PP) herbicide tank mixtures that could control both weed species if they were present in the same field. Herbicides were rated for soybean injury, weed control, population density, and aboveground biomass. Two- and three-way tank mixtures containing amitrole (i.e., glyphosate + amitrole, glyphosate + amitrole + saflufenacil, and glyphosate + amitrole + 2,4-D) were among the most effective treatments. For example, control of GR Canada fleabane and GR giant ragweed was at least 92% at 4 wk after treatment (WAT) and weed density and biomass were generally similar to the weed-free control. However, without amitrole, the best PP herbicide option was a three-way tank mixture of glyphosate + saflufenacil + 2,4-D which provided improved control and greater reductions in density and biomass compared with the two-way glyphosate tank mixtures containing saflufenacil or 2,4-D.
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Claims 5
Claim · model-written summary
Two- and three-way tank mixtures containing amitrole were among the most effective treatments against both weeds.
- Taxon
- soybean
Glycine maxt0 - Treatment
- Two- and three-way tank mixtures containing amitrolee1
- Interactor
- giant ragweed
.jpg?width=60)
Ambrosia trifidae2weed - Second interactor
- Canada fleabanee2weed
- Outcome
- most effective treatmentse1
- Direction
- among the most effectivee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
t0“in soybean”
e1“Two- and three-way tank mixtures containing amitrole (i.e., glyphosate + amitrole, glyphosate + amitrole + saflufenacil, and glyphosate + amitrole + 2,4-D) were among the most effective treatments”
e2“Populations of glyphosate-resistant (GR) Canada fleabane and GR giant ragweed can be found in several locations in southwestern Ontario”
Claim · model-written summary
Amitrole-containing tank mixtures gave at least 92% control of both weeds at 4 weeks after treatment.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Two- and three-way tank mixtures containing amitrolee1
- Interactor
- giant ragweedAmbrosia trifidae3weed
- Second interactor
- Canada fleabanee3weed
- Outcome
- controle3
- Direction
- at leaste3
- Value
- 92%e3
- Qualifier
- 4 wk after treatmente3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in soybean”
e1“Two- and three-way tank mixtures containing amitrole (i.e., glyphosate + amitrole, glyphosate + amitrole + saflufenacil, and glyphosate + amitrole + 2,4-D) were among the most effective treatments”
e3“control of GR Canada fleabane and GR giant ragweed was at least 92% at 4 wk after treatment”
Claim · model-written summary
Weed density and biomass under amitrole-containing tank mixtures were generally similar to the weed-free control.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Two- and three-way tank mixtures containing amitrolee1
- Interactor
- giant ragweedAmbrosia trifidae2weed
- Second interactor
- Canada fleabanee2weed
- Outcome
- weed density and biomasse4
- Direction
- similare4
- Comparator
- weed-free controle4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in soybean”
e1“Two- and three-way tank mixtures containing amitrole (i.e., glyphosate + amitrole, glyphosate + amitrole + saflufenacil, and glyphosate + amitrole + 2,4-D) were among the most effective treatments”
e2“Populations of glyphosate-resistant (GR) Canada fleabane and GR giant ragweed can be found in several locations in southwestern Ontario”
e4“weed density and biomass were generally similar to the weed-free control”
Claim · model-written summary
Without amitrole, the three-way glyphosate + saflufenacil + 2,4-D mixture gave improved weed control compared with two-way glyphosate mixtures.
- Taxon
- soybeanGlycine maxt0
- Treatment
- a three-way tank mixture of glyphosate + saflufenacil + 2,4-De5
- Interactor
- giant ragweedAmbrosia trifidae2weed
- Second interactor
- Canada fleabanee2weed
- Outcome
- controle5
- Direction
- improvede5
- Comparator
- two-way glyphosate tank mixtures containing saflufenacil or 2,4-De6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in soybean”
e5“a three-way tank mixture of glyphosate + saflufenacil + 2,4-D which provided improved control”
e6“greater reductions in density and biomass compared with the two-way glyphosate tank mixtures containing saflufenacil or 2,4-D”
e2“Populations of glyphosate-resistant (GR) Canada fleabane and GR giant ragweed can be found in several locations in southwestern Ontario”
Claim · model-written summary
Without amitrole, the three-way glyphosate + saflufenacil + 2,4-D mixture gave greater reductions in weed density and biomass than two-way glyphosate mixtures.
- Taxon
- soybeanGlycine maxt0
- Treatment
- a three-way tank mixture of glyphosate + saflufenacil + 2,4-De5
- Interactor
- giant ragweedAmbrosia trifidae2weed
- Second interactor
- Canada fleabanee2weed
- Outcome
- reductions in density and biomasse6
- Direction
- greatere6
- Comparator
- two-way glyphosate tank mixtures containing saflufenacil or 2,4-De6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in soybean”
e5“a three-way tank mixture of glyphosate + saflufenacil + 2,4-D which provided improved control”
e6“greater reductions in density and biomass compared with the two-way glyphosate tank mixtures containing saflufenacil or 2,4-D”
e2“Populations of glyphosate-resistant (GR) Canada fleabane and GR giant ragweed can be found in several locations in southwestern Ontario”
The same questions in other papers
glyphosate · Ambrosia trifida · Glycine max (soybean)Positive and negative results
10 papers in the same direction as this paper · 1 in the opposite direction
- positive
- positive
- no effect
8 papers more in this group
See all 12 papers →amitrole · Ambrosia trifida · Glycine max (soybean)Results agree
1 paper in the same direction as this paper
- positive
saflufenacil · Ambrosia trifida · Glycine max (soybean)Results agree
4 papers in the same direction as this paper
- positive
- positive
- positive
1 paper more in this group
See all 5 papers →2,4-D · Ambrosia trifida · Glycine max (soybean)Results agree
7 papers in the same direction as this paper
- positive
- positive
- positive
4 papers more in this group
See all 8 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.