Abstract
A 4-yr field study was conducted to evaluate yellow nutsedge suppression in ‘Tifway’ bermudagrass. Herbicide programs included preemergence (PRE) applications of metolachlor (3.4 kg ai/ha) and postemergence (POST) applications of imazaquin (0.28 kg ai/ha) plus MSMA (2.2 kg ai/ha) or halosulfuron (0.07 kg ai/ha) plus MSMA (2.2 kg/ha). Herbicides were applied to the same plots each year. Yellow nutsedge shoot suppression and tuber numbers were determined each year. Suppression of yellow nutsedge shoots increased over the 4-yr period from <74% in 1993 to >83% by 1996 with two annual applications of imazaquin plus MSMA or halosulfuron plus MSMA. PRE metolachlor applications did not suppress shoot production in any year; nor did they enhance suppression from POST treatments. Sequential applications of halosulfuron plus MSMA and imazaquin plus MSMA increased shoot suppression by 17 to 24% at 3 mo after initial treatment (MAIT) compared to single applications. All treatments reduced tuber numbers (>60%) after 4 years compared to untreated plots.Nomenclature: Halosulfuron, methyl 5-{[(4,6-dimethoxy-2-pyrimidinyl)amino]carbonyl-aminosulfonyl}-3-chloro-1-methyl-1-H-pyrazole-4-carboxylate; imazaquin, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-quinolinecarboxylic acid; metolachlor, [2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamide]; MSMA, monosodium salt of methylarsonic acid; yellow nutsedge, Cyperus esculentus L. #3 CYPES; bermudagrass, Cynodon dactylon Burtt-Davey X C. transvaalensis L. Pers. ‘Tifway’.Abbreviations: MAIT, months after initial treatment; POST, postemergence; PRE, preemergence; WAIT, weeks after initial treatment.
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Claims 4
Claim · model-written summary
Two annual applications of imazaquin plus MSMA or halosulfuron plus MSMA increased yellow nutsedge shoot suppression to above 83% by 1996.
- Taxon
- Bermudagrass
Cynodon dactylont0 - Treatment
- two annual applications of imazaquin plus MSMA or halosulfuron plus MSMAe1
- Interactor
- yellow nutsedgee1weed
- Outcome
- Suppression of yellow nutsedge shootse1
- Direction
- increasede1
- Value
- >83%e1
- Qualifier
- from <74% in 1993 to >83% by 1996e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Yellow Nutsedge (Cyperus esculentus) Management and Tuber Reduction in Bermudagrass”
e1“Suppression of yellow nutsedge shoots increased over the 4-yr period from <74% in 1993 to >83% by 1996 with two annual applications of imazaquin plus MSMA or halosulfuron plus MSMA”
Claim · model-written summary
All herbicide treatments reduced yellow nutsedge tuber numbers by more than 60% after 4 years compared with untreated plots.
- Taxon
- BermudagrassCynodon dactylont0
- Treatment
- All treatmentse4
- Interactor
- Yellow Nutsedget0weed
- Outcome
- tuber numberse4
- Direction
- reducede4
- Value
- >60%e4
- Comparator
- untreated plotse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Yellow Nutsedge (Cyperus esculentus) Management and Tuber Reduction in Bermudagrass”
e4“All treatments reduced tuber numbers (>60%) after 4 years compared to untreated plots”
Claim · model-written summary
PRE metolachlor applications did not suppress yellow nutsedge shoot production in any year and did not enhance suppression from POST treatments.
- Taxon
- BermudagrassCynodon dactylont0
- Treatment
- PRE metolachlor applicationse2
- Interactor
- Yellow Nutsedget0weed
- Outcome
- shoot productione2
- Direction
- did not suppresse2
- Comparator
- POST treatmentse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Yellow Nutsedge (Cyperus esculentus) Management and Tuber Reduction in Bermudagrass”
e2“PRE metolachlor applications did not suppress shoot production in any year; nor did they enhance suppression from POST treatments”
Claim · model-written summary
Sequential applications increased yellow nutsedge shoot suppression by 17 to 24% at 3 months after initial treatment compared with single applications.
- Taxon
- BermudagrassCynodon dactylont0
- Treatment
- Sequential applications of halosulfuron plus MSMA and imazaquin plus MSMAe3
- Interactor
- Yellow Nutsedget0weed
- Outcome
- shoot suppressione3
- Direction
- increasede3
- Value
- 17 to 24%e3
- Qualifier
- at 3 mo after initial treatment (MAIT)e3
- Comparator
- single applicationse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Yellow Nutsedge (Cyperus esculentus) Management and Tuber Reduction in Bermudagrass”
e3“Sequential applications of halosulfuron plus MSMA and imazaquin plus MSMA increased shoot suppression by 17 to 24% at 3 mo after initial treatment (MAIT) compared to single applications”
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
herbicide · yield · Cynodon dactylon (Bermuda grass)Results agree
2 papers in the same direction as this paper
- negative
- no effect
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.