Abstract
Efficacy of glyphosate on bulbous oatgrass, a creeping perennial grass, was investigated in greenhouse and growth chamber studies. Glyphosate at 1.2 and 2.5 kg ae ha −1 significantly reduced corm formation and corm viability. Glyphosate controlled bulbous oatgrass when applied at the 4- to 5- or 6- to 7-leaf stage. With 2.5 kg ha −1 , a 24-h period between glyphosate application and removal of the shoots was sufficient to cause maximum reduction in regrowth. Total amount of 14 C translocated out of leaves treated with radiolabeled glyphosate (1.0 kg ha −1 total glyphosate) did not differ among growth stages, but more 14 C accumulated in the dormant corms when glyphosate was applied at the 2- to 3-leaf stage than at the 4- to 5- or 6- to 7-leaf stages. Lack of correlation between maximum plant injury and glyphosate accumulation in corms is not understood but may be related to differences in application method in the two studies.
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Claims 8
Claim · model-written summary
Glyphosate at both rates reduced corm formation.
- Taxon
- bulbous oatgrasst0
- Treatment
- Glyphosate at 1.2 and 2.5 kg ae ha −1e0
- Outcome
- corm formatione0
- Direction
- reducede0
Not reportedComparator
Verbatim
e0“Glyphosate at 1.2 and 2.5 kg ae ha −1 significantly reduced corm formation and corm viability.”
t0“bulbous oatgrass”
Claim · model-written summary
Glyphosate at both rates reduced corm viability.
- Taxon
- bulbous oatgrasst0
- Treatment
- Glyphosate at 1.2 and 2.5 kg ae ha −1e0
- Outcome
- corm viabilitye0
- Direction
- reducede0
Not reportedComparator
Verbatim
e0“Glyphosate at 1.2 and 2.5 kg ae ha −1 significantly reduced corm formation and corm viability.”
t0“bulbous oatgrass”
Claim · model-written summary
Glyphosate controlled bulbous oatgrass at the 4- to 5-leaf stage.
- Taxon
- bulbous oatgrasse0
- Organ / stage
- 4- to 5-e0
- Treatment
- Glyphosatee0
- Outcome
- controlled bulbous oatgrasse0
- Direction
- controllede0
Not reportedInteractorComparator
Verbatim
e0“Glyphosate controlled bulbous oatgrass when applied at the 4- to 5- or 6- to 7-leaf stage.”
Claim · model-written summary
Glyphosate controlled bulbous oatgrass at the 6- to 7-leaf stage.
- Taxon
- bulbous oatgrasse0
- Organ / stage
- 6- to 7-leaf stagee0
- Treatment
- Glyphosatee0
- Outcome
- controlled bulbous oatgrasse0
- Direction
- controllede0
Not reportedComparator
Verbatim
e0“Glyphosate controlled bulbous oatgrass when applied at the 4- to 5- or 6- to 7-leaf stage.”
Claim · model-written summary
At 2.5 kg ha −1, 24 h before shoot removal was sufficient for maximum reduction in regrowth.
- Taxon
- bulbous oatgrasst0
- Treatment
- glyphosate applicatione0
- Outcome
- regrowthe0
- Direction
- reductione0
- Value
- 24-he0
- Qualifier
- 2.5 kg ha −1e0
Not reportedComparator
Verbatim
e0“With 2.5 kg ha −1 , a 24-h period between glyphosate application and removal of the shoots was sufficient to cause maximum reduction in regrowth.”
t0“bulbous oatgrass”
Claim · model-written summary
Radiolabel translocation from treated leaves did not differ among growth stages.
Verbatim
e0“Total amount of 14 C translocated out of leaves treated with radiolabeled glyphosate (1.0 kg ha −1 total glyphosate) did not differ among growth stages, but more 14 C accumulated in the dormant corms when glyphosate was applied at the 2- to 3-leaf stage than at the 4- to 5- or 6- to 7-leaf stages.”
t0“bulbous oatgrass”
Claim · model-written summary
More radiolabel accumulated in dormant corms after treatment at the 2- to 3-leaf stage than later stages.
Verbatim
e0“Total amount of 14 C translocated out of leaves treated with radiolabeled glyphosate (1.0 kg ha −1 total glyphosate) did not differ among growth stages, but more 14 C accumulated in the dormant corms when glyphosate was applied at the 2- to 3-leaf stage than at the 4- to 5- or 6- to 7-leaf stages.”
t0“bulbous oatgrass”
Claim · model-written summary
Maximum plant injury did not correlate with glyphosate accumulation in corms.
Verbatim
e0“Lack of correlation between maximum plant injury and glyphosate accumulation in corms is not understood but may be related to differences in application method in the two studies.”
t0“bulbous oatgrass”