Abstract
The use of glyphosate, as a post-emergence broad-spectrum herbicide in genetically modified glyphosate-tolerant (GT) cotton, supposes a big change in weed management programs with respect to a conventional regime. Thus, alterations in arable flora and arthropod fauna must be considered when evaluating their potential impacts. A 3-year farm-scale study was conducted in a 2-ha GT cotton crop, in southern Spain, to compare the effects of conventional and glyphosate herbicide regimes on weed abundance and diversity and their consequences for ground-dwelling predators. Surveys reveal that weed density was relatively low within all treatments with a few dominant species, with significantly higher weed densities and modifications of the floristic composition in glyphosate-treated plots that led to an increase in the abundance of Portulaca oleracea and to a reduction in plant diversity. The activity-density of the main predatory arthropod taxa (spiders, ground beetles, rove beetles and earwigs) varied among years, but no significant differences were obtained between conventional and glyphosate herbicide regimes. However, significant differences between treatments were obtained for ground beetles species richness and diversity, being higher under the glyphosate herbicide regime, and a positive correlation with weed density could be established for both parameters. The implications of these findings to weed control in GT cotton are discussed.
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Claims 9
Claim · model-written summary
Weed density was low in all cotton treatments.
- Taxon
- cotton
Gossypium hirsutumt0 - Outcome
- weed densitye0
- Direction
- relatively lowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“weed density was relatively low within all treatments with a few dominant species”
t0“Weeds and ground-dwelling predators′ response to two different weed management systems in glyphosate-tolerant cotton: A farm-scale study”
Claim · model-written summary
Glyphosate plots had significantly higher weed density.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- glyphosate-treated plotse0
- Interactor
- weede0weed
- Outcome
- weed densitiese0
- Direction
- highere0
- Comparator
- conventionale1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significantly higher weed densities and modifications of the floristic composition in glyphosate-treated plots”
e1“no significant differences were obtained between conventional and glyphosate herbicide regimes”
t0“Weeds and ground-dwelling predators′ response to two different weed management systems in glyphosate-tolerant cotton: A farm-scale study”
Claim · model-written summary
Glyphosate altered weed floristic composition.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- glyphosate-treated plotse0
- Outcome
- floristic compositione0
- Comparator
- conventionale1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“modifications of the floristic composition in glyphosate-treated plots”
e1“no significant differences were obtained between conventional and glyphosate herbicide regimes”
t0“Weeds and ground-dwelling predators′ response to two different weed management systems in glyphosate-tolerant cotton: A farm-scale study”
Claim · model-written summary
Glyphosate increased Portulaca oleracea abundance.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- glyphosate-treated plotse0
- Interactor
- Portulaca oleracea
Portulaca oleraceae0weed - Outcome
- abundance of Portulaca oleraceae0
- Direction
- increasee0
- Comparator
- conventionale1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“glyphosate-treated plots that led to an increase in the abundance of Portulaca oleracea”
e1“no significant differences were obtained between conventional and glyphosate herbicide regimes”
t0“Weeds and ground-dwelling predators′ response to two different weed management systems in glyphosate-tolerant cotton: A farm-scale study”
Claim · model-written summary
Glyphosate reduced plant diversity.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- glyphosate-treated plotse0
- Outcome
- plant diversitye0
- Direction
- reductione0
- Comparator
- conventionale1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“glyphosate-treated plots that led to an increase in the abundance of Portulaca oleracea and to a reduction in plant diversity”
e1“no significant differences were obtained between conventional and glyphosate herbicide regimes”
t0“Weeds and ground-dwelling predators′ response to two different weed management systems in glyphosate-tolerant cotton: A farm-scale study”
Claim · model-written summary
Predator activity density varied among years.
- Taxon
- cottonGossypium hirsutumt0
- Outcome
- activity-density of the main predatory arthropod taxae0
- Direction
- variede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The activity-density of the main predatory arthropod taxa (spiders, ground beetles, rove beetles and earwigs) varied among years”
t0“Weeds and ground-dwelling predators′ response to two different weed management systems in glyphosate-tolerant cotton: A farm-scale study”
Claim · model-written summary
Predator activity density did not differ significantly between herbicide regimes.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- glyphosate herbicide regimese0
- Outcome
- activity-densitye1
- Direction
- no significant differencese0
- Comparator
- conventionale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no significant differences were obtained between conventional and glyphosate herbicide regimes”
e1“The activity-density of the main predatory arthropod taxa (spiders, ground beetles, rove beetles and earwigs) varied among years”
t0“Weeds and ground-dwelling predators′ response to two different weed management systems in glyphosate-tolerant cotton: A farm-scale study”
Claim · model-written summary
Ground beetle species richness and diversity were significantly higher with glyphosate.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- glyphosate herbicide regimee0
- Outcome
- ground beetles species richness and diversitye0
- Direction
- highere0
- Comparator
- conventionale1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ground beetles species richness and diversity, being higher under the glyphosate herbicide regime”
e1“no significant differences were obtained between conventional and glyphosate herbicide regimes”
t0“Weeds and ground-dwelling predators′ response to two different weed management systems in glyphosate-tolerant cotton: A farm-scale study”
Claim · model-written summary
Ground beetle richness and diversity correlated positively with weed density.
- Taxon
- cottonGossypium hirsutumt0
- Interactor
- weede0weed
- Outcome
- ground beetles species richness and diversitye1
- Direction
- positivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a positive correlation with weed density could be established for both parameters”
e1“ground beetles species richness and diversity, being higher under the glyphosate herbicide regime”
t0“Weeds and ground-dwelling predators′ response to two different weed management systems in glyphosate-tolerant cotton: A farm-scale study”
The same questions in other papers
glyphosate · pest · Gossypium hirsutum (cotton)Positive and negative results
2 papers in the same direction as this paper · 2 in the opposite direction
- negative
- negative
- positive
1 paper more in this group
See all 5 papers →herbicide · pest · Gossypium hirsutum (cotton)Positive and negative results
6 papers in the same direction as this paper · 2 in the opposite direction
- negative
- negative
- positive
5 papers more in this group
See all 9 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.