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Effectiveness of Sulfosulfuron and Quinclorac for Weed Control during Switchgrass Establishment

Published online by Cambridge University Press:  20 January 2017

William S. Curran ,
Matthew R. Ryan ,
Matthew W. Myers  and
Paul R. Adler
William S. Curran*
Affiliation:
Department of Crop and Soil Science, The Pennsylvania State University, University Park, PA 16802
Matthew R. Ryan
Affiliation:
Department of Crop and Soil Science, The Pennsylvania State University, University Park, PA 16802
Matthew W. Myers
Affiliation:
USDA-ARS Pasture Systems and Watershed Management Research Unit, University Park, PA 16802
Paul R. Adler
Affiliation:
USDA-ARS Pasture Systems and Watershed Management Research Unit, University Park, PA 16802
*
Corresponding author's E-mail: wcurran@psu.edu
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Abstract

We conducted a field experiment in 2007 and 2008 and repeated it in a separate field in 2008 and 2009 to test the effectiveness of two herbicides applied at two different times on weed control during switchgrass establishment. At 4 and 6 wk after switchgrass planting (WAP), sulfosulfuron was applied at 0.04 and 0.07 kg ai ha−1 with nonionic surfactant and quinclorac was applied at 0.28, 0.42, and 0.56 kg ai ha−1 with methylated seed oil. Herbicides applied at 4 WAP tended to be more effective than at 6 WAP. Sulfosulfuron provided greater control of smooth pigweed; however, quinclorac provided greater control of yellow foxtail, a grass weed that has traditionally been difficult to control with herbicides in switchgrass. Average yellow foxtail control was 73, 87, and 93% for quinclorac at 0.28, 0.42, and 0.56 kg ha−1, respectively, compared to 62 and 60% for sulfosulfuron at 0.04 and 0.07 kg ha−1, respectively. Switchgrass injury (chlorosis and height reduction relative to the untreated control) was observed, but most symptoms were not detectable by 8 wk after treatment (WAT) for most treatments. Plots that received quinclorac at 0.56 kg ha−1 at 6 WAP tended to have relatively low weed biomass and high total aboveground yield in the establishment year and relatively high total aboveground yield in the year after establishment.

Realizamos un experimento de campo en 2007–2008 y lo repetimos en otro campo en 2008–2009 para evaluar la efectividad en el control de malezas de dos herbicidas aplicados en dos diferentes momentos durante el establecimiento de Panicum virgatum. A las 4 y 6 semanas después de la siembra del P. virgatum (WAP), se aplicó sulfosulfuron a 0.04 y 0.07 kg ia ha−1 con surfactante no-iónico, y se aplicó quinclorac a 0.28, 0.42 y 0.56 kg ia ha−1 con aceite de soya metilado. Los herbicidas aplicados a las 4 WAP tendieron a ser más efectivos que a las 6 WAP. El sulfosulfuron proporcionó mayor control de Amaranthus hybridus; sin embargo, el quinclorac proporcionó mejor control de Setaria pumila, una maleza que ha sido tradicionalmente difícil de controlar con herbicidas en P. virgatum. El control promedio de Setaria fue de 73, 87 y 93% para quinclorac a los 0.28, 0.42 y 0.56 kg ha−1, respectivamente, comparado a 62 y 60% para sulfosulfuron a 0.04 y 0.07 kg ha−1, respectivamente. Se observaron daños en el P. virgatum (clorosis y reducción en altura en relación con el testigo no tratado), pero la mayoría de los síntomas no fueron detectables 8 semanas después del tratamiento (WAT) en la mayoría de los tratamientos. Las parcelas que recibieron quinclorac a 0.56 kg ha−1 a las 6 WAP tendieron a exhibir relativamente baja biomasa de la maleza y alto rendimiento de tejido aéreo en el año de establecimiento y en el año siguiente al establecimiento.

Keywords

Quincloracsulfosulfuronsmooth pigweed, Amaranthus hybridus L.yellow foxtail, Setaria pumila (Poir.) Roemer & J.A. Schultesswitchgrass, Panicum virgatum L.Bioenergyperennial grass
Type
Weed Management—Other Crops/Areas
Information
Weed Technology , Volume 25 , Issue 4 , December 2011 , pp. 598 - 603
Copyright
Copyright © Weed Science Society of America 

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