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Seasonal Application Timings Affect Dallisgrass (Paspalum dilatatum) Control in Tall Fescue

Published online by Cambridge University Press:  20 January 2017

Matthew T. Elmore ,
James T. Brosnan ,
Thomas C. Mueller ,
Brandon J. Horvath ,
Dean A. Kopsell  and
Gregory K. Breeden
Matthew T. Elmore*
Affiliation:
Department of Plant Sciences, The University of Tennessee, 252 Ellington Plant Sciencces Bldg. 2431 Joe Johnson Drive. Knoxville, TN. 37996
James T. Brosnan
Affiliation:
Department of Plant Sciences, The University of Tennessee, 252 Ellington Plant Sciencces Bldg. 2431 Joe Johnson Drive. Knoxville, TN. 37996
Thomas C. Mueller
Affiliation:
Department of Plant Sciences, The University of Tennessee, 252 Ellington Plant Sciencces Bldg. 2431 Joe Johnson Drive. Knoxville, TN. 37996
Brandon J. Horvath
Affiliation:
Department of Plant Sciences, The University of Tennessee, 252 Ellington Plant Sciencces Bldg. 2431 Joe Johnson Drive. Knoxville, TN. 37996
Dean A. Kopsell
Affiliation:
Department of Plant Sciences, The University of Tennessee, 252 Ellington Plant Sciencces Bldg. 2431 Joe Johnson Drive. Knoxville, TN. 37996
Gregory K. Breeden
Affiliation:
Department of Plant Sciences, The University of Tennessee, 252 Ellington Plant Sciencces Bldg. 2431 Joe Johnson Drive. Knoxville, TN. 37996
*
Correspnding author's E-mail: [email protected]
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Abstract

Field research was conducted in 2010 and 2011 to investigate the efficacy of herbicides for dallisgrass control when applied at various growing (GDD) or cooling degree day (CDD) –based application timings. Herbicide treatments included fluazifop-p-butyl (fluazifop; 105 g ai ha−1), mesotrione (280 g ai ha−1), tembotrione (92 g ai ha−1), topramezone (37 g ai ha−1), and tank mixtures of fluazifop plus mesotrione, tembotrione, or topramezone. Herbicide treatments were applied at either 75, 175, 375, 775 GDD, or 5 CDD. Treated plots were subjected to three tall fescue interseeding regimes: no seeding, seeding in spring, or seeding in fall (0, 353, and 353 kg pure live seed ha−1, respectively). In 2010, dallisgrass control from fluazifop applied at 75, 375, and 775 GDD was poor (< 50%) by 52 wk after treatment (WAT); in 2011, control from fluazifop application at these timings was higher (62 to 72%). When applied at 175 GDD or 5 CDD in 2010 and 2011, dallisgrass control from fluazifop ranged from 79 to 93% at 52 WAT. The addition of mesotrione, tembotrione, or topramezone to fluazifop did not affect dallisgrass control at any application timing, and control provided by these herbicides alone was low (< 65%). Interseeding tall fescue in the fall improved dallisgrass control from herbicides applied at 75 GDD in 2010 and 175, 375, and 775 GDD at 52 WAT in both years. Results suggest that timing of fluazifop applications at 175 GDD and 5 CDD enhances dallisgrass control.

En 2010 y 2011, se realizó un estudio de campo para investigar la eficacia de herbicidas para el control de Paspalum dilatatum, cuando estos se aplicaron en diferentes momentos basándose en grados día de crecimiento (GDD) o enfriamiento (CDD). Los tratamientos de herbicidas incluyeron fluazifop-p-butyl (fluazifop; 105 g ai ha−1), mesotrione (280 g ai ha−1), tembotrione (92 g ai ha−1), topramezone (37 g ai ha−1), y mezclas en tanque de fluazifop más mesotrione, tembotrione, o topramezone. Los tratamientos de herbicidas fueron aplicados ya fuera a 75, 175, 375, 775 GDD, o 5 CDD. Las parcelas tratadas fueron sometidas a regímenes de entre-siembra con Lolium arundinaceum: sin siembra, siembra en la primavera, o siembra en el otoño (0, 353, y 353 kg de semilla pura viva ha−1, respectivamente). En 2010, el control de P. dilatatum con fluazifop aplicado a 75, 375 y 775 GDD fue pobre (<50%) a 52 semanas después del tratamiento (WAT). En 2011, el control con la aplicación de fluazifop en estos mismos momentos fue mayor (62 a 72%). Cuando se aplicó a 175 GDD o 5 CDD en 2010 y 2011, el control con fluazifop de P. dilatatum varió entre 79 y 93% a 52 WAT. La adición de mesotrione, tembotrione, o topramezone al fluazifop no afectó el control de P. dilatatum en ninguno de los momentos de aplicación, y el control brindado por estos herbicidas aplicados solos fue bajo (<65%). La entre-siembra de L. arundinaceum en el otoño mejoró el control de P. dilatatum para herbicidas aplicados a 75 GDD en 2010 y 175, 375, y 775 GDD a 52 WAT, en ambos años. Los resultados sugieren que realizar aplicaciones de fluazifop a 175 GDD y 5 CDD mejora el control de P dilatatum.

Keywords

Fluazifop-p-butylmesotrionetembotrionetopramezonedallisgrassPaspalum dilatatum Poirtall fescueLolium arundinaceum (Schreb.) S.J. Darbyshire4-hydroxyphenylpyruvate dioxygenaseACCasearyloxyphenoxypropionatecooling degree daygrowing degree dayHPPDinterseedingpyrazolonetriketoneturfgrass
Type
Weed Management—Other Crops/Areas
Information
Weed Technology , Volume 27 , Issue 3 , September 2013 , pp. 557 - 564
Copyright
Copyright © Weed Science Society of America 

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