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Response of Seeded Miscanthus × giganteus to PRE and POST Herbicides

Published online by Cambridge University Press:  20 January 2017

Eric K. Anderson ,
Aaron G. Hager ,
DoKyoung Lee ,
Damian J. Allen  and
Thomas B. Voigt
Eric K. Anderson
Affiliation:
Department of Crop Sciences, University of Illinois at Urbana-Champaign, Urbana, IL 61801
Aaron G. Hager
Affiliation:
Department of Crop Sciences, University of Illinois at Urbana-Champaign, Urbana, IL 61801
DoKyoung Lee
Affiliation:
Department of Crop Sciences, University of Illinois at Urbana-Champaign, Urbana, IL 61801
Damian J. Allen
Affiliation:
Department of Agronomy, Purdue University, West Lafayette, IN 47907
Thomas B. Voigt*
Affiliation:
Department of Crop Sciences, University of Illinois at Urbana-Champaign, Urbana, IL 61801
*
Corresponding author's E-mail: [email protected].
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Abstract

Miscanthus × giganteus cv. Illinois is a high-yielding perennial grass crop being developed for cellulosic biomass production in the United States. It is a sterile cultivar and must be established using plantlets or rhizomes; this asexual propagation is relatively expensive, thereby limiting more widespread acceptance. Perennial, tetraploid, seeded types of M. × giganteus have been developed that could reduce establishment costs, while producing high biomass yields. Weed control during the year of establishment is essential because this grass crop does not compete well with weeds in the establishment year. Greenhouse and field experiments were conducted to identify PRE and POST herbicides that would not adversely affect seeded M. × giganteus emergence or growth. Imazethapyr and quinclorac applied PRE had no negative affect on M. × giganteus growth in the greenhouse with respect to seedling emergence, plant height, observed injury symptoms, or fresh weight. In the field, plant emergence was significantly higher with quinclorac plus atrazine than the nontreated control, and emergence with isoxaflutole plus atrazine was not significantly different from the control. Six herbicides applied POST in the greenhouse showed little or no negative effect on miscanthus growth. In the field, several PRE plus POST herbicide combinations did not negatively affect M. × giganteus growth; however, none of these provided adequate weed control under irrigated conditions. Further evaluation of PRE and POST herbicides is needed to identify robust weed control options that are safe on seeded M. × giganteus.

Miscanthus × giganteus cv. 'Illinois' es una gramínea perenne de alto rendimiento que está siendo desarrollada para la producción de biomasa celulósica en los Estados Unidos. Este cultivar es estéril y debe ser establecido usando rebrotes o rizomas. Esta propagación asexual es relativamente costosa, lo que limita su amplia aceptación. Se han desarrollado tipos de M. × giganteus que son perennes, tetraploides, y que producen semilla, lo que podría reducir los costos de establecimiento, al tiempo que producen altos rendimientos de biomasa. El control de malezas durante el año de establecimiento es esencial porque este cultivo gramínea no compite bien con las malezas en el año de establecimiento. Se realizaron experimentos de invernadero y de campo para identificar herbicidas PRE y POST que no afectarían en forma negativa la emergencia y el crecimiento de M. × giganteus a partir de semilla. Imazethapyr y quinclorac aplicados PRE no tuvieron efectos negativos en el crecimiento de M. × giganteus en el invernadero con respecto a la emergencia de plántulas, la altura de planta, los síntomas de daño observados, o el peso fresco. En el campo, la emergencia de plantas fue significativamente mayor con quinclorac más atrazine que en el testigo sin tratamiento, y la emergencia con isoxaflutole más atrazine no fue significativamente diferente del testigo. Seis herbicidas aplicados POST en el invernadero mostraron poco o ningún efecto negativo sobre el crecimiento del M. × giganteus. Sin embargo, ninguno de estos herbicidas brindó un control adecuado de malezas en condiciones de riego. Se necesitan más evaluaciones de herbicidas PRE y POST para identificar opciones robustas para el control de malezas que sean seguras para M. × giganteus establecido a partir de semillas.

Keywords

ImazethapyrquincloracMiscanthus × giganteus Greef and Deuter ex Hodkinson and RenvoizeBiomasscellulosic feedstockestablishmentperennial grassweed control
Type
Research Article
Information
Weed Technology , Volume 29 , Issue 2 , June 2015 , pp. 274 - 283
Copyright
Copyright © Weed Science Society of America 

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