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Control of Flaxleaf Fleabane (Conyza bonariensis) in Wheat and Sorghum

Hanwen Wu, Steve Walker, Geoff Robinson and Neil Coombes
Weed Technology
Vol. 24, No. 2 (APRIL-JUNE 2010), pp. 102-107
Stable URL: http://www.jstor.org/stable/40801088
Page Count: 6
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Control of Flaxleaf Fleabane (Conyza bonariensis) in Wheat and Sorghum
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Abstract

Flaxleaf fleabane is a difficilit-to-control weed in dryland minimum tillage farming systems in the northeast grains region of Australia. Experiments were conducted between 2003 and 2005 to identify effective control strategies on flaxleaf fleabane in wheat and sorghum. A preplant application of chlorsulfuron at 15 g ai/ha in wheat controlled flaxleaf fleabane ≥ 90%. The efficacy of early postemergent applications of metsulfuron-methyl at 4.2 g ai/ha varied between years. However, the flaxleaf fleabane was controlled > 85% with metsulfuron-methyl at 4.2 g ai/ha plus MCPA at 420 g ae/ha plus picloram at 26 g ae/ha, or metsulfuron-methyl followed by late postemergent 2,4-D amine at 300 g ae/ha. In sorghum, a preplant application of glyphosate at 900 g ae/ha plus 2,4-D amine at 900 g ae/ha or dicamba at 500 g ae/ha at 1 mo before sorghum planting provided ≥ 95% control. Preplant atrazine at 2,000 g ai/ha controlled flaxleaf fleabane 83 to 100% in sorghum. At-planting atrazine at 2,000 or 1,000 g ai/ha can be applied to control new emergence of flaxleaf fleabane and grasses, depending on the weed pressure and spectrum. Flaxleaf fleabane reduced sorghum yield 65 to 98% if not controlled. La Conyza bonariensis es una maleza difícil de controlar en tierra seca con un sistema de labranza mínima en la región productora de granos del noreste de Australia. Se llevaron al cabo experimentos entre 2003 y 2005 para identificar las estrategias de control más efectivas para Conyza bonariensis en trigo y sorgo. Una aplicación en pre-siembra de chlorosulfuron a 15 g ia/ha en el trigo, controló Conyza bonariensis ≥ 90%. La eficacia de las aplicaciones tempranas postsiembra de metsulfuron-methyl a 4.2 g ia/ha varió de un año a otro. Sin embargo, la Conyza bonariensis fue controlada > 85% con metsulfuron-methyl a 4.2 g ia/ha más MCPA a 420 g ea/ha más picloram a 26 g ea/ha, o metsulfuron-methyl fb LPOST 2,4-D amine a 300 g ea/ha. En el caso del sorgo, una aplicación de glifosato en pre-siembra a 900 g ea/ha más 2,4-D amine a 900 g ea/ha o dicamba a 500 g ea/ha un mes antes de la siembra proporcionó ≥ 95% de control. En el cultivo de sorgo, la aplicación de atrazine en pre-siembra a 2000 g ia/ha controló la Conyza bonariensis de 83 al 100%. La aplicación de atrazine en la siembra a 2000 o 1000 g ia/ha puede ser usada para controlar nueva emergencia de la Conyza bonariensis y otros zacates, dependiendo de la presión y el espectro de la maleza. La Conyza bonariensis redujo el rendimiento del sorgo entre un 65 y un 98% cuando no se controló.

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