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Yellow Nutsedge (Cyperus esculentus) Management and Tuber Reduction in Bermudagrass (Cynodon dactylon × C. transvaalensis) Turf with Selected Herbicide Programs1

Published online by Cambridge University Press:  20 January 2017

David B. Lowe ,
Ted Whitwell ,
S. Bruce Martin  and
Lambert B. Mccarty
David B. Lowe*
Affiliation:
Department of Horticulture, Clemson University, Clemson, SC 29634
Ted Whitwell
Affiliation:
Department of Horticulture, Clemson University, Clemson, SC 29634
S. Bruce Martin
Affiliation:
Department of Plant Pathology, Florence, SC 29501
Lambert B. Mccarty
Affiliation:
Department of Horticulture, Clemson University, Clemson, SC 29634
*
Corresponding author's E-mail: [email protected].
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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.

Keywords

Halosulfuron, methyl 5-{[(4,6-dimethoxy-2-pyrimidinyl)amino]carbonyl-aminosulfonyl}-3-chloro-1-methyl-1-H-pyrazole-4-carboxylateimazaquin, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-quinolinecarboxylic acidmetolachlor, [2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamide]MSMA, monosodium salt of methylarsonic acidyellow nutsedge, Cyperus esculentus L. # CYPESbermudagrass, Cynodon dactylon Burtt-Davey X C. transvaalensis L. Pers. ‘Tifway’MAIT, months after initial treatmentPOST, postemergencePRE, preemergenceWAIT, weeks after initial treatment
Type
Research
Information
Weed Technology , Volume 14 , Issue 1 , March 2000 , pp. 72 - 76
Copyright
Copyright © Weed Science Society of America 

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Footnotes

1 Technical Contribution 4492 of the South Carolina Agricultural Experiment Station, Clemson University.

References

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