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Flucarbazone–Sodium Absorption, Translocation, and Metabolism in Bermudagrass, Kentucky Bluegrass, and Perennial Ryegrass

Published online by Cambridge University Press:  20 January 2017

Patrick E. McCullough ,
Sudeep S. Sidhu ,
Rashmi Singh  and
Thomas V. Reed
Patrick E. McCullough*
Affiliation:
University of Georgia, Griffin, GA 30223
Sudeep S. Sidhu
Affiliation:
University of Georgia, Griffin, GA 30223
Rashmi Singh
Affiliation:
University of Georgia, Griffin, GA 30223
Thomas V. Reed
Affiliation:
University of Georgia, Griffin, GA 30223
*
Corresponding author's E-mail: pmccull@uga.edu
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Abstract

Perennial ryegrass is overseeded in bermudagrass and Kentucky bluegrass to improve turf quality, but selective control may be warranted for transition back to monostand turfgrass. Flucarbazone–sodium controls perennial ryegrass in bermudagrass and Kentucky bluegrass, but the physiological basis of selectivity has received limited investigation. Greenhouse and laboratory experiments were conducted to evaluate efficacy, absorption, translocation, and metabolism of flucarbazone–sodium in these grasses. Flucarbazone–sodium reduced perennial ryegrass shoot mass from the nontreated an average ≈ 22 times and 3 times more than bermudagrass and Kentucky bluegrass at 4 wk after treatment, respectively. In laboratory experiments, foliar and root absorption of 14C–flucarbazone–sodium were similar among species. Bermudagrass distributed ≈ 25% more foliar-absorbed 14C to nontreated shoots than Kentucky bluegrass and perennial ryegrass. From root applications, all grasses averaged 84% distribution of 14C to shoots. Bermudagrass and Kentucky bluegrass metabolized 100% and 74% of 14C–flucarbazone–sodium at 1 d after treatment (DAT), whereas perennial ryegrass metabolism measured 44, 58, and 65% at 1, 3, and 7 DAT, respectively. Bermudagrass, Kentucky bluegrass, and perennial ryegrass had 4, 4, and 2 metabolites after 7 d, respectively. Results suggest differential metabolism of flucarbazone–sodium is attributed to selectivity for controlling perennial ryegrass in bermudagrass and Kentucky bluegrass.

Keywords

Flucarbazone–sodiumbermudagrass [Cynodon dactylon (L.) Pers. × Cynodon transvaalensis Burtt-Davy] ‘Princess-77’Kentucky bluegrass (Poa pratensis L.) ‘Midnight’perennial ryegrass (Lolium perenne L.) ‘Manhattan V’.Efficacyherbicide fateoverseedingselectivityturfgrassherbicide uptake
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 62 , Issue 2 , June 2014 , pp. 230 - 236
Copyright
Copyright © Weed Science Society of America 

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