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Evaluation of Thiencarbazone-methyl– and Isoxaflutole-Based Herbicide Programs in Corn

Published online by Cambridge University Press:  20 January 2017

Daniel O. Stephenson IV  and
Jason A. Bond
Daniel O. Stephenson IV*
Affiliation:
Dean Lee Research and Extension Center, Louisiana State University Agricultural Center, 8105 Tom Bowman Drive, Alexandria, LA 71302
Jason A. Bond
Affiliation:
Delta Research and Extension Center, Mississippi State University, P.O. Box 197, Stoneville, MS 38776
*
Corresponding author's E-mail: [email protected]
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Abstract

Field studies were conducted in Louisiana and Mississippi in 2009 and 2010 to evaluate PRE herbicide treatments containing isoxaflutole or a prepackaged mixture of thiencarbazone-methyl : isoxaflutole (TCM : isoxaflutole) for weed control in corn. PRE treatments included the premix of TCM : isoxaflutole alone (30 : 80 g ai ha−1) and with atrazine (1,120 g ai ha−1), isoxaflutole alone (90 g ai ha−1) and with atrazine (1,120 g ai ha−1), and the premix of atrazine plus S-metolachlor (1,820 plus 1,410 g ai ha−1). POST treatments included glufosinate (450 g ai ha−1) or glyphosate (870 g ae ha−1) applied to 30-cm corn along with a no POST treatment. All PRE treatments controlled barnyardgrass, entireleaf morningglory, rhizomatous johnsongrass, Palmer amaranth, and velvetleaf 87 to 95% 4 wk after planting (WAP) and browntop millet and hophornbeam copperleaf were controlled 86 to 95% 8 WAP. Weed control was improved 8 and 20 WAP when either POST treatment was applied. TCM : isoxaflutole plus atrazine controlled barnyardgrass, entireleaf morningglory, Palmer amaranth, and velvetleaf at least 90% 20 WAP regardless of POST treatment. TCM : isoxaflutole plus atrazine provided greater control of browntop millet (90%) than isoxaflutole alone or with atrazine and atrazine plus S-metolachlor where control was 86% 20 WAP. Pooled across POST treatments, all PRE treatments containing isoxaflutole or TCM : isoxaflutole controlled rhizomatous johnsongrass better (74 to 76%) than atrazine plus S-metolachlor (67%). Corn yield following herbicide treatments ranged from 9,280 to 11,040 kg ha−1 compared with 9,110 kg ha−1 for the nontreated. Results indicate that TCM : isoxaflutole or isoxaflutole PRE is an option for use in a corn weed management program and may prolong the use of atrazine where weed resistance may be an issue. Where rhizomatous johnsongrass is a problem, TCM : isoxaflutole or isoxaflutole PRE can provide better control than atrazine plus S-metolachlor PRE. Without PRE treatments, glufosinate or glyphosate was needed for season-long weed control.

En 2009 y 2010 se llevaron a cabo estudios de campo en Louisiana y Mississippi para evaluar tratamientos de herbicidas PRE que contenían isoxaflutole o una mezcla preenvasada de thiencarbazone-methyl:isoxaflutole (TCM:isoxaflutole), para el control de malezas en maíz. Los tratamientos PRE incluyeron la premezcla de TCM:isoxaflutole solo (30:80 g ia ha−1) y con atrazine (1120 g ia ha−1), isoxaflutole solo (90 g ia ha−1) y con atrazine (1120 g ia ha−1), y la premezcla de atrazine más S-metolachlor (1820 más 1410 g ia ha−1). Los tratamientos POST incluyeron glufosinate (450 g ia ha−1) o glifosato (870 g ea ha−1) aplicados cuando el maíz tenía 30 cm de altura junto con un testigo sin tratamiento POST. Todos los tratamientos PRE controlaron Echinochloa crus-galli, Ipomoea hederacea, Sorghum halepense, Amaranthus palmeri y Abutilon theophrasti de 87 a 95% 4 semanas después de la siembra (WAP), y Urochloa ramosa y Acalypha ostryifolia de 86 a 95% 8 WAP. El control de malezas mejoró a las 8 y 20 WAP cuando se aplicó cualquiera de los dos tratamientos POST. TCM: isoxaflutole más atrazine controló E.crus-galli, I. hederacea, A. palmeri y A. theophrasti al menos 90% 20 WAP, sin importar el tratamiento POST. TCM:isoxaflutole más atrazine proporcionó mejor control de U. ramosa (90%) que isoxaflutole por sí solo o con atrazine y que atrazine más S-metolachlor, en cuyo caso el control fue 86% 20 WAP. Promediando los tratamientos POST, todos los tratamientos PRE que contenían isoxaflutole o TCM:isoxaflutole, controlaron S. halepense mejor (74 a 76%) que atrazine más S-metolachlor (67%). El rendimiento del maíz después de los tratamientos con herbicida varió de 9280 a 11040 kg ha−1 en comparación con 9110 kg ha−1 para el testigo no tratado. Los resultados indican que la aplicación PRE de TCM:isoxaflutole o isoxaflutole es una opción para usar en un programa de manejo de malezas en maíz y podría prolongar el uso de atrazine donde la resistencia de la maleza puede ser un problema. En situaciones donde S. halepense es un problema, TCM:isoxaflutole o isoxaflutole aplicados PRE pueden proporcionar mejor control que atrazine más S-metolachlor PRE. Sin tratamientos PRE, se requirió glufosinate o glifosato para el control de malezas a lo largo del ciclo de cultivo.

Keywords

AtrazineglufosinateglyphosateisoxaflutoleS-metolachlorthiencarbazone-methyl, methyl 4-[(4,5-dihydro-3-methoxy-4-methyl-5-oxo-1H-1,2,4-triazol-1-yl)carboxamidosulfonyl]-5-methylthiophene-3-carboxylatebarnyardgrass, Echinochloa crus-galli (L.) Beauv. ECHCGbrowntop millet, Urochloa ramosa (L.) Nguyen PANRAentireleaf morningglory, Ipomoea hederacea (L.) Jacq. var. integriuscula Gray IPOHGhophornbeam copperleaf, Acalypha ostryifolia Riddell ACCOSjohnsongrass, Sorghum halepense (L.) Pers. SORHAPalmer amaranth, Amaranthus palmeri S. Wats. AMAPAvelvetleaf, Abutilon theophrasti Medik ABUTHcorn, Zea mays L.Postemergencepreemergenceweed control
Type
Weed Management—Major Crops
Information
Weed Technology , Volume 26 , Issue 1 , March 2012 , pp. 37 - 42
Copyright
Copyright © Weed Science Society of America 

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