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Evaluation of Application Program and Timing in Herbicide-Resistant Corn

Published online by Cambridge University Press:  20 January 2017

Laura E. Lindsey ,
Wesley J. Everman ,
Andrew J. Chomas  and
James J. Kells
Laura E. Lindsey
Affiliation:
Department of Crop and Soil Sciences, Michigan State University, East Lansing, MI 48824
Wesley J. Everman
Affiliation:
Department of Crop Science, North Carolina State University, Box 7620, Raleigh, NC 27695
Andrew J. Chomas
Affiliation:
Department of Crop and Soil Sciences, Michigan State University, East Lansing, MI 48824
James J. Kells*
Affiliation:
Department of Crop and Soil Sciences, Michigan State University, East Lansing, MI 48824
*
Corresponding author's E-mail: kells@msu.edu
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Abstract

Field studies were conducted from 2007 to 2009 in East Lansing, MI to evaluate three residual herbicide programs, three POST herbicide application timings, and two POST herbicides in glyphosate- and glufosinate-resistant corn. Herbicide programs included a residual PRE-applied herbicide followed by (fb) POST application (residual fb POST), a residual herbicide tank-mixed with a POST herbicide (residual + POST), and a nonresidual POST. Three POST herbicide application timings included early POST (EP), mid-POST (MP), and late POST (LP) at an average corn growth stage of V3/V4, V4/V5, and V5/V6, respectively. The two POST herbicides evaluated were glyphosate and glufosinate. Control of common lambsquarters and giant foxtail was evaluated 28 d after the LP application. Glyphosate often provided greater weed control than glufosinate. The LP application resulted in greater giant foxtail control compared with the EP application timing, which may be attributed to control of late-emerging weeds. The EP application timing improved common lambsquarters control compared with the LP application timing. The residual + POST program resulted in greater weed control compared with the residual fb POST program in all years. The effect of residual herbicide program, POST herbicide, and POST application timing on corn grain yield varied by year. In 2007, the use of glyphosate resulted in higher grain yield compared with glufosinate. In 2008, corn grain yield was the highest in the PRE fb POST program and with POST applications at EP and MP. To provide the most consistent weed control and minimize the likelihood of grain yield reductions, a PRE fb POST program applied at EP or MP is recommended.

En East Lansing, MI, se realizaron estudios de campo desde 2007 a 2009 para evaluar tres programas de herbicidas residuales, tres momentos de aplicación de herbicidas POST y dos herbicidas POST en maíz resistente a glyphosate y a glufosinate. Los programas de herbicidas incluyeron un herbicida residual aplicado PRE seguido de (fb) una aplicación POST (residual fb POST), y una aplicación no residual POST. Los tres momentos de aplicación POST incluyeron POST temprano (EP), POST medio (MP) y POST tardío (LP) a un estado de desarrollo promedio del maíz de V3/V4, V4/V5 y V5/V6, respectivamente. Los dos herbicidas POST evaluados fueron glyphosate y glufosinate. El control de Chenopodium album y Setaria faberi fue evaluado 28 d después de la aplicación LP. Glyphosate frecuentemente brindó mayor control de malezas que glufosinate. La aplicación LP resultó en mayor control de S. faberi comparada a la aplicación EP, lo cual podría ser atribuido al control de malezas de emergencia tardía. La aplicación EP mejoró el control de C. album comparada con la aplicación LP. El programa residual + POST resultó en mayor control de malezas comparado con el programa residual fb POST en todos los años. El efecto del programa residual de herbicidas, de herbicidas POST y del momento de aplicación en el rendimiento de grano del maíz varió según el año. En 2007, el uso de glyphosate resultó en un mayor rendimiento de grano comparado con glufosinate. En 2008, el mayor rendimiento de grano del maíz se obtuvo en el programa PRE fb POST y con aplicaciones POST EP y MP. Para brindar un control de malezas más consistente y minimizar la probabilidad de reducciones en rendimiento de grano, se recomienda el programa PRE fb POST aplicado a EP o MP.

Keywords

Acetochloratrazineglufosinateglyphosatecommon lambsquarters, Chenopodium album L.giant foxtail, Setaria faberi Herrmcorn, Zea mays L.Grain yieldpostemergencepreemergenceresidual herbicide
Type
Weed Management—Major Crops
Information
Weed Technology , Volume 26 , Issue 4 , December 2012 , pp. 617 - 621
Copyright
Copyright © Weed Science Society of America 

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