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Pyroxasulfone with and without Sulfentrazone in Sunflower (Helianthus annuus)

Published online by Cambridge University Press:  20 January 2017

Brian L. S. Olson
Department of Agronomy, Kansas State University, Manhattan, KS 67701
Richard K. Zollinger
Department of Plant Sciences, North Dakota State University, Fargo, ND 58108
Curtis R. Thompson
Department of Agronomy, Kansas State University, Manhattan, KS 66506
Dallas E. Peterson
Department of Agronomy, Kansas State University, Manhattan, KS 66506
Brian Jenks
North Central Research Extension Center, North Dakota State University, Minot, ND 58701
Mike Moechnig
Plant Science Department, South Dakota State University, Brookings, SD 57007
Phillip W. Stahlman
Kansas State University Agricultural Research Center, Hays, KS 67601


Pyroxasulfone (KIH-485) is a seedling growth-inhibiting herbicide developed by Kumiai America that has the potential to control weeds in sunflower. However, little is known about how this herbicide will interact with various soil types and environments when combined with sulfentrazone. The objective of this research was to evaluate sunflower injury and weed control with pyroxasulfone applied with and without sulfentrazone across the Great Plains sunflower production area. A multisite study was initiated in spring 2007 to evaluate sunflower response to pyroxasulfone applied PRE at 0, 167, 208, or 333 g ai ha−1. In 2008, pyroxasulfone was applied alone and in tank mixture with sulfentrazone. In 2007, no sunflower injury was observed with any rate of pyroxasulfone at any location except Highmore, SD, where sunflower injury was 17%, 4 wk after treatment (WAT) with 333 g ha−1. In 2008, sunflower injury ranged from 0 to 4% for all treatments. Adding sulfentrazone did not increase injury. Sunflower yield was only reduced in treatments in which weeds were not effectively controlled. These treatments included the untreated control and pyroxasulfone at 167 g ha−1. Sunflower yield did not differ among the other treatments of pyroxasulfone or sulfentrazone applied alone or in combination. The addition of sulfentrazone to pyroxasulfone improved control of foxtail barley, prostrate pigweed, wild buckwheat, Palmer amaranth, and marshelder, but not large crabgrass or green foxtail. The combination of pyroxasulfone and sulfentrazone did not reduce control of any of the weeds evaluated.

El pyroxasulfone (KIH-485) es un herbicida inhibidor del crecimiento de plántulas desarrollado por Kumiai América, que tiene el potencial para el control de maleza en cultivo del girasol. Sin embargo, se sabe poco acerca de cómo este herbicida interactúa con varios tipos de suelo y ambientes cuando se combina con sulfentrazone. El objetivo de esta investigación fue evaluar el daño al girasol y el control de maleza con pyroxasulfone aplicado con y sin sulfentrazone a lo largo del área de producción del girasol en los Great Plains, de Norteamérica. En la primavera de 2007 se inició un estudio en múltiples sitios para evaluar la respuesta de girasol a la aplicación PRE de pyroxasulfone a 0, 167, 208, o 333 g ia ha−1. En 2008, se aplicó pyroxasulfone solo y en mezclas con sulfentrazone. En 2007, no se observó daño alguno al girasol a cualquier dosis de pyroxasulfone en ninguna de los sitios, excepto en Highmore, SD, donde el daño fue 17%, 4 semanas después del tratamiento (WAT) con 333 g ha−1. En 2008, el daño al girasol varió de 0 a 4% para todos los tratamientos. La adición de sulfentrazone no incrementó el daño. El rendimiento del girasol se redujo solamente en los tratamientos donde la maleza no se controló con efectividad. Estos tratamientos incluyeron el testigo no tratado y pyroxasulfone a 167 g ha−1. No hubo diferencia en el rendimiento del girasol entre los otros tratamientos de pyroxasulfone o sulfentrazone aplicado solo o en combinación. La adición de sulfentrazone a pyroxasulfone mejoró el control de Hordeum jubatum, Amaranthus blitoides, Polygonum convolvulus, Amaranthus palmeri e Iva xanthifolia pero no el de Digitaria sanguinalis o Setaria viridis. La combinación de pyroxasulfone y sulfentrazone no redujo el control de ninguna maleza evaluada.

Weed Management—Other Crops/Areas
Copyright © Weed Science Society of America 

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