Abstract
Glyphosate resistant giant ragweed is an increasing problem in glyphosate resistant cropping systems in southwestern Ontario. The postemergence herbicides registered for use in soybean in Ontario do not provide consistent control of glyphosate resistant giant ragweed. There is limited research on the lowest effective rate of 2,4-D for the control of glyphosate resistant giant ragweed. Consequently, the objectives of this study were a) to determine the efficacy of herbicides applied postemergence for the control of glyphosate resistant giant ragweed in glyphosate resistant soybean, and b) to determine the lowest effective rate of 2,4-D for the control of glyphosate-resistant giant ragweed. Ten postemergence herbicide combinations and seven rates of 2,4-D were evaluated in field studies conducted in 2011 and 2012 at six locations confirmed with glyphosate-resistant giant ragweed. The post emergence herbicides evaluated did not provide acceptable/consistent control. Of the herbicides evaluated, glyphosate plus cloransulam-methyl provided 26% to 70% control 8 WAA of glyphosate resistant giant ragweed, which was the best of the herbicides combinations evaluated. The doses of 2,4-D required to reduce giant ragweed shoot dry weight by 50, 80 and 95% were 142, 310 and 1048 g a.e. ha-1, respectively.
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Claims 5
Claim · model-written summary
Evaluated postemergence herbicides did not provide acceptable consistent ragweed control.
- Taxon
- soybean
Glycine maxe1 - Interactor
- giant ragweed
.jpg?width=60)
Ambrosia trifidae2weed - Outcome
- acceptable/consistent controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“The post emergence herbicides evaluated did not provide acceptable/consistent control”
e1“in soybean”
e2“glyphosate resistant giant ragweed in glyphosate resistant soybean”
Claim · model-written summary
Glyphosate plus cloransulam-methyl was the best evaluated combination, providing 26% to 70% ragweed control at 8 WAA.
- Taxon
- soybeanGlycine maxe1
- Treatment
- glyphosate plus cloransulam-methyle0
- Interactor
- giant ragweedAmbrosia trifidae0weed
- Outcome
- control 8 WAA of glyphosate resistant giant ragweede0
- Direction
- beste0
- Value
- 26% to 70%e0
- Comparator
- herbicides combinations evaluatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“glyphosate plus cloransulam-methyl provided 26% to 70% control 8 WAA of glyphosate resistant giant ragweed, which was the best of the herbicides combinations evaluated”
e1“in soybean”
Claim · model-written summary
A 2,4-D dose of 142 g a.e. ha-1 reduced ragweed shoot dry weight by 50%.
- Taxon
- soybeanGlycine maxe1
- Treatment
- 2,4-De0
- Interactor
- giant ragweedAmbrosia trifidae0weed
- Outcome
- giant ragweed shoot dry weighte0
- Direction
- reducee0
- Value
- 142e0
- Qualifier
- by 50e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The doses of 2,4-D required to reduce giant ragweed shoot dry weight by 50, 80 and 95% were 142, 310 and 1048 g a.e. ha-1, respectively”
e1“in soybean”
Claim · model-written summary
A 2,4-D dose of 310 g a.e. ha-1 reduced ragweed shoot dry weight by 80%.
- Taxon
- soybeanGlycine maxe1
- Treatment
- 2,4-De0
- Interactor
- giant ragweedAmbrosia trifidae0weed
- Outcome
- giant ragweed shoot dry weighte0
- Direction
- reducee0
- Value
- 310e0
- Qualifier
- 80e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The doses of 2,4-D required to reduce giant ragweed shoot dry weight by 50, 80 and 95% were 142, 310 and 1048 g a.e. ha-1, respectively”
e1“in soybean”
Claim · model-written summary
A 2,4-D dose of 1048 g a.e. ha-1 reduced ragweed shoot dry weight by 95%.
- Taxon
- soybeanGlycine maxe1
- Treatment
- 2,4-De0
- Interactor
- giant ragweedAmbrosia trifidae0weed
- Outcome
- giant ragweed shoot dry weighte0
- Direction
- reducee0
- Value
- 1048 g a.e. ha-1e0
- Qualifier
- 95%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The doses of 2,4-D required to reduce giant ragweed shoot dry weight by 50, 80 and 95% were 142, 310 and 1048 g a.e. ha-1, respectively”
e1“in soybean”
The same questions in other papers
glyphosate · Ambrosia trifida · Glycine max (soybean)Positive and negative results
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- no effect
- positive
- positive
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See all 12 papers →cloransulam-methyl · Ambrosia trifida · Glycine max (soybean)Results agree
2 papers in the same direction as this paper
- positive
- positive
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.