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Evaluation of Season-Long Weed Management Programs in Red Beet

Published online by Cambridge University Press:  23 February 2017

Jed B. Colquhoun*
Affiliation:
Department of Horticulture, University of Wisconsin-Madison, Madison, WI 53706
Daniel J. Heider
Affiliation:
Department of Horticulture, University of Wisconsin-Madison, Madison, WI 53706
Richard A. Rittmeyer
Affiliation:
Department of Horticulture, University of Wisconsin-Madison, Madison, WI 53706
*
Corresponding author's E-mail: Colquhoun@wisc.edu

Abstract

Red beet growers have expressed interest in adopting the microrate herbicide approach originally implemented in sugarbeet to achieve season-long weed management. Several red beet herbicides were first labeled for use in sugarbeet and lack substantial residual weed control. In response, red beet herbicide programs were evaluated that included a PRE application followed by up to three POST applications of various herbicide combinations. This research, however, indicated that herbicide programs that included PRE herbicides followed by as few as one or two POST applications that involve multiple active ingredients can provide season-long weed control. This observation was consistent across a broad spectrum of weeds, between two study locations that varied in soil type, and during two growing seasons. Herbicide programs that included only a PRE and six-leaf red beet growth stage application were successful at two locations in maintaining weed control and crop yield relative to hand-weeded red beet. Furthermore, these herbicide programs reduced the number of applications by 50% compared with the full programs, reducing crop injury risk and grower cost.

Los productores de remolacha roja han expresado interés en adoptar el uso de la estrategia de micro-dosis de herbicidas, originalmente implementada en la producción de remolacha azucarera para alcanzar un manejo de malezas a lo largo de toda la temporada de crecimiento. Varios herbicidas para remolacha roja fueron registrados primero para uso en remolacha azucarera, sin embargo carecen de control sustancial residual. En respuesta a estas necesidades, se evaluaron programas de herbicidas que incluyeron una aplicación PRE seguida por hasta tres aplicaciones POST de varias combinaciones de herbicidas. Esta investigación, sin embargo, indicó que los programas de herbicidas que incluyeron herbicidas PRE seguidos con tan sólo una o dos aplicaciones POST que incluyeron múltiples ingredientes activos pudieron brindar un control de malezas a lo largo de toda la temporada. Esta observación fue consistente para un amplio espectro de malezas, en dos localidades con diferente tipo de suelo, y durante dos temporadas de crecimiento. Los programas de herbicidas que incluyeron solamente una aplicación PRE en el estadio de seis hojas de la remolacha roja, fueron exitosas en dos localidades para mantener el control de malezas y el rendimiento del cultivo en relación a la remolacha roja con deshierba manual. Además, estos programas de herbicidas redujeron el número de aplicaciones en 50% al compararse con los programas completos, lo que redujo el riesgo de daño al cultivo y el costo al productor.

Type
Research Article
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Associate editor for this paper: Robert Nurse, Agriculture and Agri-Food Canada.

References

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