Abstract
ABSTRACT Field and greenhouse experiments were conducted to determine the extent of purple nutsedge (Cyperus rotundus L.) control in bermudagrass (Cynodon spp.) turf by halosulfuron (methyl 5- [[(4, 6-dimethoxy-2-pyriiTUdinyl)-amino]carbonylaminosulfonyl]-3-chloro-l-H-pyrazole-4-carboxylate) or imazaquin (2-[4,5-dihydro-4-methyl-4-(l-methyIethyl)-5-oxo-lH-imidazol-2-yl]-3-quinolinecarboxylic acid)/MSMA (monosodium methanearsonate), and to determine the extent of purple nutsedge regrowth from basal bulbs after foliar treatment with these herbicides. Excellent initial control (> 80%) of emerged shoots of purple nutsedge occurred with halosulfuron or imazaquin + MSMA. However, purple nutsedge shoots emerged within 3 or 4 weeks after all treatments, and nutsedge shoot density increased with time. With a rapid increase in purple nutsedge shoot density, the extent of control deteriorated rapidly, even after two applications of halosulfuron. Both halosulfuron at 70 g ha−1 and imazaquin at 0.42 kg ha−1 + MSMA at 1.7 kg ha−1 provided complete reduction of regrowth from basal bulbs 7 weeks after treatment. At 4 months after treatment, all pots treated with imazaquin + MSMA had nutsedge regrowth, but only one of five pots showed regrowth from halosulfuron, thus both treatments provided substantial, but not complete control of regrowth. The short period of field control likely results from sprouting of previously dormant nutsedge tubers that are unaffected by soil residual activity of halosulfuron or imazaquin.
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Claims 8
Claim · model-written summary
Halosulfuron provided more than 80% initial control of emerged purple nutsedge shoots.
- Taxon
- bermudagrass
Cynodon dactylone2 - Treatment
- halosulfurone0
- Interactor
- purple nutsedgee0weed
- Outcome
- controle0
- Direction
- Excellente0
- Value
- > 80%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Excellent initial control (> 80%) of emerged shoots of purple nutsedge occurred with halosulfuron or imazaquin + MSMA.”
e2“bermudagrass (Cynodon spp.) turf”
Claim · model-written summary
Imazaquin plus MSMA provided more than 80% initial control of emerged purple nutsedge shoots.
- Taxon
- bermudagrassCynodon dactylone2
- Treatment
- imazaquin + MSMAe0
- Interactor
- purple nutsedgee0weed
- Outcome
- controle0
- Direction
- Excellente0
- Value
- > 80%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Excellent initial control (> 80%) of emerged shoots of purple nutsedge occurred with halosulfuron or imazaquin + MSMA.”
e2“bermudagrass (Cynodon spp.) turf”
Claim · model-written summary
Purple nutsedge shoots emerged within 3 or 4 weeks after all treatments and density increased over time.
Verbatim
e0“purple nutsedge shoots emerged within 3 or 4 weeks after all treatments, and nutsedge shoot density increased with time.”
Claim · model-written summary
Halosulfuron completely reduced regrowth from basal bulbs at seven weeks.
- Taxon
- purple nutsedget0
- Treatment
- halosulfuron at 70 g ha−1e0
- Outcome
- regrowth from basal bulbse0
- Direction
- complete reductione0
- Qualifier
- 7 weeks after treatmente0
Not reportedComparator
Verbatim
e0“Both halosulfuron at 70 g ha−1 and imazaquin at 0.42 kg ha−1 + MSMA at 1.7 kg ha−1 provided complete reduction of regrowth from basal bulbs 7 weeks after treatment.”
t0“Purple Nutsedge”
Claim · model-written summary
Imazaquin plus MSMA completely reduced regrowth from basal bulbs at seven weeks.
- Taxon
- purple nutsedget0
- Treatment
- imazaquin at 0.42 kg ha−1 + MSMA at 1.7 kg ha−1e0
- Outcome
- regrowth from basal bulbse0
- Direction
- complete reductione0
- Qualifier
- 7 weeks after treatmente0
Not reportedComparator
Verbatim
e0“Both halosulfuron at 70 g ha−1 and imazaquin at 0.42 kg ha−1 + MSMA at 1.7 kg ha−1 provided complete reduction of regrowth from basal bulbs 7 weeks after treatment.”
t0“Purple Nutsedge”
Claim · model-written summary
At four months, all imazaquin plus MSMA pots showed nutsedge regrowth.
Verbatim
e0“At 4 months after treatment, all pots treated with imazaquin + MSMA had nutsedge regrowth”
t0“Purple Nutsedge”
Claim · model-written summary
At four months, one of five halosulfuron pots showed nutsedge regrowth.
Verbatim
e0“only one of five pots showed regrowth from halosulfuron”
t0“Purple Nutsedge”
Claim · model-written summary
The authors attributed short field control to previously dormant tubers sprouting after treatment.
Verbatim
e0“The short period of field control likely results from sprouting of previously dormant nutsedge tubers that are unaffected by soil residual activity of halosulfuron or imazaquin.”
t0“Purple Nutsedge”
The same questions in other papers
imazaquin · control · Cynodon dactylon (Bermuda grass)Positive and negative results
4 papers in the same direction as this paper · 1 reporting no difference from an alternative
- positive
- no effect
- positive
2 papers more in this group
See all 6 papers →Halosulfuron-methyl · control · Cynodon dactylon (Bermuda grass)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.