Abstract
In Argentinean crop fields, weed control is mainly achieved by intense use of glyphosate as a nonselective and/or selective herbicide. Glyphosate use is very high as more than 95% of the 16 million ha soybean crop consists of glyphosate-resistant cultivars, always treated with this herbicide. From initial success, inconsistent glyphosate control of Johnsongrass, an invading C4 perennial grass of soybean crops, has become evident to producers from northern Argentina over the last 3 yr. Prior to this, glyphosate provided good control. This study evaluated the nature of these recurrent glyphosate failures in Johnsongrass. Experiments conducted with Johnsongrass plants obtained from seed and rhizome phytomers collected from fields with intense glyphosate use history showed that these populations showed differential survival and biomass productivity when glyphosate treated than Johnsongrass plants obtained from similar propagules collected from field sites with no history of glyphosate use. This empirical evidence establishes that the Johnsongrass survival in glyphosate-treated transgenic soybean fields from northern Argentina is due to evolved glyphosate resistance.
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Claims 4
Claim · model-written summary
Glyphosate control of Johnsongrass became inconsistent after previously good control.
- Taxon
- soybean
Glycine maxe0 - Interactor
- Johnsongrass
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Sorghum halepensee0weed - Outcome
- glyphosate control of Johnsongrasse0
- Setting
- northern Argentinae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“inconsistent glyphosate control of Johnsongrass, an invading C4 perennial grass of soybean crops, has become evident to producers from northern Argentina over the last 3 yr. Prior to this, glyphosate provided good control.”
Claim · model-written summary
Johnsongrass populations from fields with intense glyphosate history differed in survival under glyphosate from populations with no such history.
- Taxon
- soybeanGlycine maxe1
- Treatment
- glyphosate treatede0
- Interactor
- JohnsongrassSorghum halepensee0weed
- Outcome
- differential survivale0
- Comparator
- Johnsongrass plants obtained from similar propagules collected from field sites with no history of glyphosate usee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“these populations showed differential survival and biomass productivity when glyphosate treated than Johnsongrass plants obtained from similar propagules collected from field sites with no history of glyphosate use.”
e1“Johnsongrass, an invading C4 perennial grass of soybean crops”
Claim · model-written summary
Johnsongrass populations from glyphosate-use fields differed in biomass productivity under treatment from populations without that history.
- Taxon
- soybeanGlycine maxe1
- Treatment
- glyphosate treatede0
- Interactor
- JohnsongrassSorghum halepensee0weed
- Outcome
- biomass productivitye0
- Comparator
- Johnsongrass plants obtained from similar propagules collected from field sites with no history of glyphosate usee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“these populations showed differential survival and biomass productivity when glyphosate treated than Johnsongrass plants obtained from similar propagules collected from field sites with no history of glyphosate use.”
e1“Johnsongrass, an invading C4 perennial grass of soybean crops”
Claim · model-written summary
The authors attribute Johnsongrass survival in treated soybean fields to evolved glyphosate resistance.
- Taxon
- soybeanGlycine maxe0
- Interactor
- JohnsongrassSorghum halepensee0weed
- Outcome
- Johnsongrass survivale0
- Qualifier
- evolved glyphosate resistancee0
- Setting
- northern Argentinae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the Johnsongrass survival in glyphosate-treated transgenic soybean fields from northern Argentina is due to evolved glyphosate resistance.”
The same questions in other papers
glyphosate · Sorghum halepense · Glycine max (soybean)Positive and negative results
16 in the opposite direction
- positive
- positive
- positive
13 papers more in this group
See all 17 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.