Abstract
Common ragweed is an important broadleaf weed in agronomic crops in the northcentral United States. A common ragweed biotype in glyphosate-resistant (GR) soybean production field in southeast Nebraska was not controlled after sequential applications of glyphosate at the labeled rate. The objectives of this study were to confirm GR common ragweed in Nebraska by quantifying the level of resistance in greenhouse and field whole-plant dose-response studies and to evaluate the response of the putative GR common ragweed to POST corn and soybean herbicides. Greenhouse whole-plant dose-response studies confirmed 7- and 19-fold resistance to glyphosate compared to the known glyphosate-susceptible (GS) biotype based on biomass reduction and control estimates, respectively. Field dose-response studies conducted in 2015 and 2016 at the putative GR common ragweed research site suggested that glyphosate doses equivalent to 15- and 40-times the labeled rate (1,260 gaeha –1 ) were required for 90% control and biomass reduction, respectively. Response of GR common ragweed to POST soybean herbicides in greenhouse studies indicated ≥89% control with acifluorfen, fomesafen, fomesafen plus glyphosate, glyphosate plus dicamba or 2,4-D choline, glufosinate, imazamox plus acifluorfen, and lactofen. POST corn herbicides, including 2,4-D, bromoxynil, diflufenzopyr plus dicamba, glufosinate, halosulfuron-methyl plus dicamba, mesotrione plus atrazine, and tembotrione provided ≥87% control, indicating that POST herbicides with distinct modes of action are available in corn and soybean for effective control of GR common ragweed. Results also suggested a reduced efficacy of the acetolactate synthase (ALS)-inhibiting herbicides tested in this study for control of GR and GS biotypes, indicating further research is needed to determine whether this biotype has evolved multiple herbicide resistance.
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Claims 10
Claim · model-written summary
Sequential labeled glyphosate applications failed to control common ragweed in a Nebraska soybean field.
- Taxon
- soybean
Glycine maxe0 - Treatment
- sequential applications of glyphosate at the labeled ratee0
- Interactor
- common ragweed
Ambrosia artemisiifoliae0weed - Outcome
- common ragweed biotypee0
- Direction
- not controllede0
- Setting
- southeast Nebraskae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn and Soybean”
t1“Common Ragweed (Ambrosia artemisiifolia)”
e0“A common ragweed biotype in glyphosate-resistant (GR) soybean production field in southeast Nebraska was not controlled after sequential applications of glyphosate at the labeled rate”
Claim · model-written summary
Greenhouse biomass reduction indicated sevenfold glyphosate resistance in the ragweed biotype.
- Taxon
- Corn and SoybeanGlycine max
Zea mays subsp. mayst0 - Interactor
- common ragweedAmbrosia artemisiifoliat1weed
- Outcome
- resistance to glyphosatee0
- Value
- 7-e0
- Comparator
- glyphosate-susceptible (GS) biotypee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn and Soybean”
t1“Common Ragweed (Ambrosia artemisiifolia)”
e0“Greenhouse whole-plant dose-response studies confirmed 7- and 19-fold resistance to glyphosate compared to the known glyphosate-susceptible (GS) biotype based on biomass reduction and control estimates, respectively”
Claim · model-written summary
Greenhouse control estimates indicated nineteenfold glyphosate resistance.
- Taxon
- Corn and SoybeanGlycine maxZea mays subsp. mayst0
- Interactor
- Common RagweedAmbrosia artemisiifoliat1weed
- Outcome
- resistance to glyphosatee0
- Value
- 19-folde0
- Comparator
- glyphosate-susceptible (GS) biotypee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn and Soybean”
t1“Common Ragweed (Ambrosia artemisiifolia)”
e0“19-fold resistance to glyphosate compared to the known glyphosate-susceptible (GS) biotype based on biomass reduction and control estimates, respectively”
Claim · model-written summary
Field results indicated fifteen times the labeled glyphosate rate was needed for 90% ragweed control.
- Taxon
- Corn and SoybeanGlycine maxZea mays subsp. mayst0
- Interactor
- Common RagweedAmbrosia artemisiifoliat1weed
- Outcome
- 90% controle0
- Value
- 15-e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn and Soybean”
t1“Common Ragweed (Ambrosia artemisiifolia)”
e0“glyphosate doses equivalent to 15- and 40-times the labeled rate (1,260 gaeha –1 ) were required for 90% control and biomass reduction, respectively”
Claim · model-written summary
Field results indicated forty times the labeled glyphosate rate was needed for biomass reduction.
- Taxon
- Corn and SoybeanGlycine maxZea mays subsp. mayst0
- Interactor
- Common RagweedAmbrosia artemisiifoliat1weed
- Outcome
- biomass reductione0
- Value
- 40-timese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn and Soybean”
t1“Common Ragweed (Ambrosia artemisiifolia)”
e0“glyphosate doses equivalent to 15- and 40-times the labeled rate (1,260 gaeha –1 ) were required for 90% control and biomass reduction, respectively”
Claim · model-written summary
Acifluorfen controlled at least 89% of glyphosate-resistant ragweed in greenhouse soybean studies.
- Taxon
- soybeanGlycine maxe0
- Treatment
- acifluorfene0
- Interactor
- common ragweedAmbrosia artemisiifoliae0weed
- Outcome
- GR common ragweede0
- Direction
- controle0
- Value
- ≥89%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn and Soybean”
t1“Common Ragweed (Ambrosia artemisiifolia)”
e0“Response of GR common ragweed to POST soybean herbicides in greenhouse studies indicated ≥89% control with acifluorfen”
Claim · model-written summary
Other listed soybean postemergence herbicides each achieved at least 89% ragweed control.
- Taxon
- soybeanGlycine maxe0
- Interactor
- common ragweedAmbrosia artemisiifoliae0weed
- Outcome
- controle0
- Value
- ≥89%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn and Soybean”
t1“Common Ragweed (Ambrosia artemisiifolia)”
e0“Response of GR common ragweed to POST soybean herbicides in greenhouse studies indicated ≥89% control with acifluorfen, fomesafen, fomesafen plus glyphosate, glyphosate plus dicamba or 2,4-D choline, glufosinate, imazamox plus acifluorfen, and lactofen”
Claim · model-written summary
Listed corn postemergence herbicides provided at least 87% ragweed control.
- Taxon
- cornZea mays subsp. mayse0
- Interactor
- Common RagweedAmbrosia artemisiifoliat1weed
- Outcome
- ≥87% controle0
- Value
- ≥87%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn and Soybean”
t1“Common Ragweed (Ambrosia artemisiifolia)”
e0“POST corn herbicides, including 2,4-D, bromoxynil, diflufenzopyr plus dicamba, glufosinate, halosulfuron-methyl plus dicamba, mesotrione plus atrazine, and tembotrione provided ≥87% control”
Claim · model-written summary
ALS-inhibiting herbicides had reduced efficacy against both resistant and susceptible ragweed biotypes.
- Taxon
- Corn and SoybeanGlycine maxZea mays subsp. mayst0
- Interactor
- Common RagweedAmbrosia artemisiifoliat1weed
- Outcome
- efficacye0
- Direction
- reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn and Soybean”
t1“Common Ragweed (Ambrosia artemisiifolia)”
e0“reduced efficacy of the acetolactate synthase (ALS)-inhibiting herbicides tested in this study for control of GR and GS biotypes”
Claim · model-written summary
The authors call for research on possible multiple herbicide resistance in the ragweed biotype.
- Taxon
- Corn and SoybeanGlycine maxZea mays subsp. mayst0
- Outcome
- further research is needed to determine whether this biotype has evolved multiple herbicide resistancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn and Soybean”
t1“Common Ragweed (Ambrosia artemisiifolia)”
e0“further research is needed to determine whether this biotype has evolved multiple herbicide resistance”
The same questions in other papers
glyphosate · Ambrosia artemisiifolia · Glycine max (soybean)Positive and negative results
1 paper in the same direction as this paper · 8 in the opposite direction
- positive
- positive
- positive
6 papers more in this group
See all 10 papers →acifluorfen · Ambrosia artemisiifolia · Glycine max (soybean)Results agree
3 papers in the same direction as this paper
- positive
- positive
- positive
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.