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Response of Three Switchgrass (Panicum virgatum) Cultivars to Mesotrione, Quinclorac, and Pendimethalin

Published online by Cambridge University Press:  20 January 2017

Rick A. Boydston ,
Harold P. Collins  and
Steven C. Fransen
Rick A. Boydston*
Affiliation:
Agricultural Research Service, U.S. Department of Agriculture, Irrigated Agriculture Research and Extension Center, Prosser, WA 99350-9687
Harold P. Collins
Affiliation:
Agricultural Research Service, U.S. Department of Agriculture, Irrigated Agriculture Research and Extension Center, Prosser, WA 99350-9687
Steven C. Fransen
Affiliation:
Crop and Soil Sciences Department, Washington State University, Prosser, WA 99350-9687
*
Corresponding author's E-mail: [email protected].
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Abstract

Annual grass weed control and switchgrass cultivar response to PRE-applied pendimethalin and POST-applied mesotrione and quinclorac was evaluated in 2005 and 2006 near Paterson, WA, in both newly seeded and 1-yr-old established switchgrass. Pendimethalin applied to newly planted switchgrass at 1.1 kg ai ha−1 at the one-leaf stage in 2005 or at 0.67 kg ha−1 PRE in 2006 severely injured and greatly reduced switchgrass stands. Mesotrione applied POST at 0.07 kg ai ha−1 injured newly planted switchgrass, reduced switchgrass height for several weeks after treatment, and reduced final switchgrass biomass by 54% both years. ‘Kanlow’ and ‘Cave-in-Rock’ cultivars were injured less by mesotrione than ‘Shawnee’ in 2005, whereas in 2006, Kanlow was injured less than Shawnee and Cave-in-Rock. Quinclorac applied POST at 0.56 kg ai ha−1 injured newly planted switchgrass less than mesotrione and pendimethalin but reduced final switchgrass biomass by 33% both years compared with treatment with atrazine alone. All three herbicide treatments controlled large crabgrass in the year of establishment. Green foxtail counts were reduced 93% or more by pendimethalin and quinclorac compared with nontreated controls, but mesotrione failed to control green foxtail. Pendimethalin applied PRE at 1.1 kg ha−1 did not injure 1-yr-old established switchgrass or reduce switchgrass biomass. Quinclorac applied POST at 0.56 kg ha−1 to established switchgrass reduced switchgrass biomass of the first harvest by 16% in 1 of 2 yr. Mesotrione applied POST at 0.07 kg ha−1 injured established switchgrass and reduced biomass of the first harvest by 33 and 17% in 2005 and 2006, respectively. Kanlow was injured the least by mesotrione in both years. Established switchgrass suppressed late-emerging annual grass weeds sufficiently to avoid the need for a grass-specific herbicide application.

El trabajo tuvo como objetivo evaluar el control de maleza de gramíneas anuales y la respuesta de cultivares de Panicum virgatum a pendimetalina aplicada en preemergencia (PRE) y de mesotrione y quinclorac en postemergencia (POST) en parcelas de nueva siembra y en parcelas de un año de establecidas. El trabajo se efectuó en terrenos cerca de Paterson, WA en 2005 y 2006. La pendimetalina en dosis de 1.1 kg ia ha−1, aplicada PRE en Panicum virgatum recién sembrado y en etapa de una hoja en 2005 o en dosis de 0.67 kg ia ha−1 en 2006, causó daño severo y redujo considerablemente el número de plantas. El mesotrione aplicado POST en dosis de 0.07 kg ia ha−1 dañó el Panicum virgatum recién sembrado, disminuyó su crecimiento por varias semanas después del tratamiento y redujo su biomasa final 54%, en ambos años. En 2005, la aplicación de mesotrione causó menos daño en los cultivares ‘Kanlow’ y ‘Cave-in-Rock’ que en el ‘Shawnee’; en 2006, el Kanlow se dañó menos que el Shawnee y el Cave-in-Rock. El quinclorac aplicado POST en dosis de 0.56 kg ia ha−1, causó menos daño en Panicum virgatum recién sembrado que el mesotrione y pendimetalina, pero disminuyó 33% su biomasa final en ambos años, comparado con el tratamiento de atrazina. Los tres tratamientos de herbicida controlaron Digitaria sanguinalis el año de establecimiento. Comparado con el testigo no tratado, el número de plantas de Setaria viridis se redujó 93% o más con pendimetalina y el quinclorac, pero el mesotrione no controló esta maleza. Pendimentalina aplicada PRE en dosis de 1.1 kg ia ha−1, no dañó las plantas de Panicum virgatum de un año de establecidas, ni redujo su biomasa. El quinclorac aplicado POST en dosis de 0.56 kg ia ha−1 en las parcelas ya establecidas de Panicum virgatum, redujo el 16% de la biomasa del primer corte, en uno de los dos años que duró el estudio. El mesotrione aplicado POST en dosis de 0.07 kg ia ha−1 dañó el pasto ya establecido y redujo el rendimiento de la primer cosecha en un 33% y en un 17% en el 2005 y 2006, respectivamente. El cultivar Kanlow sufrió un daño menor cuando se aplicó el mesotrione en ambos años. El Panicum virgatum ya establecido, suprimió la emergencia tardía de maleza de gramíneas anuales lo suficiente para evitar la necesidad de la aplicación de un herbicida específico para el control de gramíneas indeseables.

Keywords

Mesotrionependimethalinquincloracgreen foxtailSetaria viridis L. SETVIlarge crabgrassDigitaria sanguinalis L. Scop. DIGSAswitchgrassPanicum virgatum L. ‘Cave-in-Rock’‘Kanlow’‘Shawnee’Biofuelherbicide injurywarm-season grassweed controlweed management
Type
Weed Management—Other Crops/Areas
Information
Weed Technology , Volume 24 , Issue 3 , September 2010 , pp. 336 - 341
Copyright
Copyright © Weed Science Society of America 

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