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Screening Preemergence and Postemergence Herbicides for Safety in Bioenergy Crops

Published online by Cambridge University Press:  20 January 2017

Larissa L. Smith ,
Shawn D. Askew ,
Edward S. Hagood Jr.  and
Jacob N. Barney
Larissa L. Smith
Affiliation:
Department of Plant Pathology, Physiology and Weed Science, Virginia Tech, Blacksburg, VA 24061
Shawn D. Askew
Affiliation:
Department of Plant Pathology, Physiology and Weed Science, Virginia Tech, Blacksburg, VA 24061
Edward S. Hagood Jr.
Affiliation:
Department of Plant Pathology, Physiology and Weed Science, Virginia Tech, Blacksburg, VA 24061
Jacob N. Barney*
Affiliation:
Department of Plant Pathology, Physiology and Weed Science, Virginia Tech, Blacksburg, VA 24061
*
Corresponding author's E-mail: jnbarney@vt.edu.
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Abstract

Interest in the cultivation of bioenergy feedstocks has increased the need for information in this rapidly developing sector of agriculture. Many fast-growing, large-statured perennial grasses have been selected because of their high biomass production potential, competitive nature, and ability to tolerate marginal growing conditions. However, weed pressure in the establishment phase can be detrimental to crop yield. Weed control is one of the most costly and resource-intensive aspects of bioenergy crop establishment. Unfortunately, little information exists on practical weed management techniques for the majority of these new crops. The tolerance of switchgrass, big bluestem, reed canarygrass, sorghum, giant reed, eulaliagrass, and giant miscanthus (sterile and seeded) to 22 PRE and 22 POST herbicides were evaluated. Plants were grown in the greenhouse and evaluated for injury, height, and aboveground biomass after 5 or 7 wk for PRE and POST applications, respectively. PRE and POST application of 2,4-D, bentazon, bromoxynil, carfentrazone, dicamba, halosulfuron, and topramezone did not significantly injure any species. Giant miscanthus was more tolerant to PRE herbicides when established from rhizomes compared with seed establishment. Supporting previous research, all eulaliagrass and switchgrass cultivars demonstrated comparable tolerance to PRE application of all 22 herbicides. With the information gained in this study a suite of herbicides may have potential for use in bioenergy crops; however, they should be tested on larger-scale field trials over multiple growing seasons to validate initial findings.

El interés en la producción de cultivos para bioenergía ha incrementado la necesidad de información en este sector de la agricultura de rápido desarrollo. Muchas gramíneas perennes de rápido crecimiento y alta estatura han sido seleccionadas debido a su alto potencial de producción de biomasa, naturaleza competitiva, y habilidad para tolerar condiciones de crecimiento marginales. Sin embargo, la presión de malezas durante la fase de establecimiento puede causar un detrimento del rendimiento del cultivo. El control de malezas es uno de los aspectos más costosos y de altos requerimientos para el establecimiento de cultivos para bioenergía. Desafortunadamente, existe poca información acerca de las técnicas de manejo práctico de malezas para la mayoría de estos nuevos cultivos. Se evaluó la tolerancia de Panicum virgatum, Andropogon gerardii, Phalaris arundinacea, sorgo, Arundo donax, Miscanthus sinensis, y Miscanthus × giganteus (estéril y con semilla) a 22 herbicidas PRE y 22 herbicidas POST. Las plantas fueron crecidas en invernadero y evaluadas por daño, altura, y biomasa del tejido aéreo después de 5 ó 7 semanas para las aplicaciones PRE y POST, respectivamente. La aplicación PRE y POST de 2,4-D, bentazon, bromoxynil, carfentrazone, dicamba, halosulfuron, y topramezone no dañó significativamente ninguna de estas especies. M. × giganteus fue más tolerante a herbicidas PRE cuando fue establecido a partir de rizomas en lugar de semillas. Consistente con investigaciones previas, todos los cultivares de M. sinensis y P. virgatum mostraron una tolerancia comparable entre ellos a la aplicación PRE de todos los 22 herbicidas. Con la información generada en este estudio hay un grupo de herbicidas que pueden tener potencial de uso en cultivos para bioenergía. Sin embargo, estos deben ser evaluados en estudios de campo de mayor escala a lo largo de múltiples temporadas de crecimiento para validar estos resultados iniciales.

Keywords

2,4-D amineacetochloraminopyralidatrazinebentazonbromoxynilcarfentrazonedicambaflumioxazinhalosulfuronisoxabenisoxaflutolemesotrionenicosulfuronpendimethalinpyroxasulfonesethoxydimsimazinesulfentrazonetembotrionetopramezonebig bluestem, Andropogon gerardii Vitmaneulaliagrass, Miscanthus sinensis Anderssongiant miscanthus, Miscanthus × giganteus Greef and Deuter ex Hodkinson and Renvoizegiant reed, Arundo donax L.reed canarygrass, Phalaris arundinacea L.switchgrass, Panicum virgatum L.Biofuelherbicide toleranceweed control
Type
Research Article
Information
Weed Technology , Volume 29 , Issue 1 , March 2015 , pp. 135 - 146
Copyright
Copyright © Weed Science Society of America 

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