Abstract
Vink, J. P., Soltani, N., Robinson, D. E., Tardif, F. J., Lawton, M. B. and Sikkema, P. H. 2012. Glyphosate-resistant giant ragweed ( Ambrosia trifida L.) control with preplant herbicides in soybean [ Glycine max (L.) Merr.]. Can. J. Plant Sci. 92: 913–922. Giant ragweed populations in southwestern Ontario have evolved resistance to glyphosate. Glyphosate-resistant (GR) giant ragweed interference in field crops can lead to significant yield losses. Eleven field trials [five with preplant (PP) burndown only and six with PP burndown plus residual herbicides] were conducted in 2010 and 2011 on Ontario farms with GR giant ragweed to evaluate the efficacy of various PP herbicides applied prior to soybean planting. Glyphosate applied at the recommended field dose failed to adequately control GR giant ragweed. The PP herbicides 2,4-D ester, cloransulam-methyl and saflufenacil applied alone and with glyphosate provided 97–99, 68–100 and 71–94% control, respectively and resulted in soybean yields equivalent to the weed-free check. Combinations of glyphosate plus cloransulam-methyl or linuron controlled GR giant ragweed 8 wk after application (WAA), 75–95 and 95–98%, respectively. Residual control with glyphosate plus linuron resulted in soybean yield equivalent to the weed-free check. Based on these results, GR giant ragweed can be controlled prior to soybean planting in southwestern Ontario.
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Claims 9
Claim · model-written summary
Recommended-dose glyphosate did not adequately control glyphosate-resistant giant ragweed in soybean.
- Taxon
- soybean
Glycine maxt0 - Treatment
- Glyphosatee0
- Interactor
- giant ragweed
.jpg?width=60)
Ambrosia trifidae0weed - Outcome
- GR giant ragweede0
- Direction
- failed to adequately controle0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Glyphosate applied at the recommended field dose failed to adequately control GR giant ragweed”
t0“soybean [Glycine max (L.) Merr.]”
Claim · model-written summary
Preplant 2,4-D ester provided 97–99% giant ragweed control.
- Taxon
- soybeanGlycine maxt0
- Treatment
- 2,4-D estere0
- Interactor
- giant ragweedAmbrosia trifidae1weed
- Outcome
- controle0
- Direction
- controle0
- Value
- 97–99e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The PP herbicides 2,4-D ester, cloransulam-methyl and saflufenacil applied alone and with glyphosate provided 97–99, 68–100 and 71–94% control, respectively”
t0“soybean [Glycine max (L.) Merr.]”
e1“giant ragweed populations in southwestern Ontario”
Claim · model-written summary
Preplant cloransulam-methyl provided 68–100% giant ragweed control.
- Taxon
- soybeanGlycine maxt0
- Treatment
- cloransulam-methyle0
- Interactor
- giant ragweedAmbrosia trifidae1weed
- Outcome
- controle0
- Direction
- controle0
- Value
- 68–100e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The PP herbicides 2,4-D ester, cloransulam-methyl and saflufenacil applied alone and with glyphosate provided 97–99, 68–100 and 71–94% control, respectively”
t0“soybean [Glycine max (L.) Merr.]”
e1“giant ragweed populations in southwestern Ontario”
Claim · model-written summary
Preplant saflufenacil provided 71–94% giant ragweed control.
- Taxon
- soybeanGlycine maxt0
- Treatment
- saflufenacile0
- Interactor
- giant ragweedAmbrosia trifidae1weed
- Outcome
- controle0
- Direction
- controle0
- Value
- 71–94%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The PP herbicides 2,4-D ester, cloransulam-methyl and saflufenacil applied alone and with glyphosate provided 97–99, 68–100 and 71–94% control, respectively”
t0“soybean [Glycine max (L.) Merr.]”
e1“giant ragweed populations in southwestern Ontario”
Claim · model-written summary
The three preplant herbicides yielded soybean yields equivalent to the weed-free check.
- Taxon
- soybeanGlycine maxe0
- Treatment
- 2,4-D ester, cloransulam-methyl and saflufenacile1
- Interactor
- giant ragweedAmbrosia trifidat0weed
- Outcome
- soybean yieldse0
- Direction
- equivalente0
- Comparator
- weed-free checke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“resulted in soybean yields equivalent to the weed-free check”
e1“2,4-D ester, cloransulam-methyl and saflufenacil”
t0“giant ragweed (Ambrosia trifida L.)”
Claim · model-written summary
Glyphosate plus cloransulam-methyl controlled giant ragweed by 75–95% at eight weeks.
- Taxon
- soybeanGlycine maxt0
- Treatment
- glyphosate plus cloransulam-methyle0
- Interactor
- giant ragweedAmbrosia trifidae0weed
- Outcome
- GR giant ragweede0
- Direction
- controllede0
- Value
- 75–95e0
- Qualifier
- 8 wk after application (WAA)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Combinations of glyphosate plus cloransulam-methyl or linuron controlled GR giant ragweed 8 wk after application (WAA), 75–95 and 95–98%, respectively”
t0“soybean [Glycine max (L.) Merr.]”
Claim · model-written summary
Glyphosate plus linuron controlled giant ragweed by 95–98% at eight weeks.
- Taxon
- soybeanGlycine maxt0
- Treatment
- glyphosate plus cloransulam-methyl or linurone0
- Interactor
- giant ragweedAmbrosia trifidae0weed
- Outcome
- GR giant ragweede0
- Direction
- controllede0
- Value
- 95–98%e0
- Qualifier
- 8 wk after application (WAA)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Combinations of glyphosate plus cloransulam-methyl or linuron controlled GR giant ragweed 8 wk after application (WAA), 75–95 and 95–98%, respectively”
t0“soybean [Glycine max (L.) Merr.]”
Claim · model-written summary
Residual glyphosate plus linuron gave soybean yield equivalent to a weed-free check.
- Taxon
- soybeanGlycine maxe0
- Treatment
- glyphosate plus linurone0
- Interactor
- giant ragweedAmbrosia trifidat0weed
- Outcome
- soybean yielde0
- Direction
- equivalente0
- Comparator
- weed-free checke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Residual control with glyphosate plus linuron resulted in soybean yield equivalent to the weed-free check”
t0“giant ragweed (Ambrosia trifida L.)”
Claim · model-written summary
The authors conclude that glyphosate-resistant giant ragweed can be controlled before soybean planting in southwestern Ontario.
- Taxon
- soybeanGlycine maxe0
- Interactor
- giant ragweedAmbrosia trifidae0weed
- Outcome
- GR giant ragweed can be controlled prior to soybean plantinge0
- Setting
- southwestern Ontarioe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GR giant ragweed can be controlled prior to soybean planting 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
- positive
8 papers more in this group
See all 12 papers →ester · Ambrosia trifida · Glycine max (soybean)Results agree
1 paper in the same direction as this paper
- positive
cloransulam-methyl · Ambrosia trifida · Glycine max (soybean)Results agree
2 papers in the same direction as this paper
- positive
- 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.