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Efficacy of Various Corn Herbicides Applied Preplant Incorporated and Preemergence

Published online by Cambridge University Press:  20 January 2017

William G. Johnson ,
Gurinderbir S. Chahal  and
David L. Regehr
William G. Johnson
Affiliation:
Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907
Gurinderbir S. Chahal*
Affiliation:
Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907
David L. Regehr
Affiliation:
Department of Agronomy, Kansas State University, Manhattan, KS, 66506
*
Corresponding author's E-mail: [email protected]
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Abstract

Field studies were conducted in central Missouri and central Kansas to evaluate the crop tolerance and efficacy of various combinations of atrazine, flufenacet + isoxaflutole, flumetsulam + clopyralid, isoxaflutole, and S-metolachlor applied PPI or PRE in conventional-till corn. Application technique did not influence crop injury in Kansas. In Missouri, greater crop injury was observed with treatments containing isoxaflutole when applied PPI vs. PRE. Application technique influenced giant foxtail, ivyleaf morningglory, large crabgrass, Palmer amaranth, and common waterhemp control. In dry years, control of these weeds was usually either same or greater with PPI than it was with PRE treatments. In years with average to above average precipitation, isoxaflutole provided greater control as a PRE application than as a PPI application. Palmer amaranth and common waterhemp control was usually greater with atrazine, isoxaflutole, and S-metolachlor applied PRE than it was applied PPI. Differences in control of all weeds between PPI and PRE applications were less obvious with two or three herbicides compared with treatments with a single herbicide. In general, the corn yield was greater with most of the treatments having two, three, or four herbicides than it was with treatments having a single herbicide, which was due to better weed control with the tank-mixtreatments.

Se realizaron estudios de campo en el centro de Missouri y en el centro de Kansas para evaluar la tolerancia del cultivo y la eficacia de varias combinaciones de atrazine, flufenacet + isoxaflutole, flumetsulam + clopyralid, isoxaflutole, y S-metolachlor aplicadas pre-siembra incorporada (PPI) o pre- emergencia (PRE) en maíz de labranza convencional. La técnica de aplicación no influyó en el daño al cultivo en Kansas. En Missouri, se observó mayor daño al cultivo con tratamientos que contenían isoxaflutole cuando se aplicaron PPI en comparación a PRE. La técnica de aplicación influyó en el control de Setaria faberi, Ipomoea hederacea, Digitaria sanguinalis, Amaranthus palmeri y Amaranthus rudis. En años de baja precipitación, el control de estas malezas fue usualmente, igual o mayor con tratamientos PPI que con los PRE. En años de precipitación promedio o mayor, isoxaflutole proporcionó mejor control con la aplicación PRE que con la PPI. El control de A. palmeri y A. rudis fue usualmente mayor en aplicaciones PRE que PPI cuando se usó atrazine, isoxaflutole y S-metolachlor. Las diferencias en el control de todas las malezas entre las aplicaciones PPI y PRE fueron menos obvias con mezclas de dos o tres herbicidas en comparación a los tratamientos de un solo herbicida. En general, el rendimiento de maíz fue mejor con los tratamientos que tenían dos, tres o cuatro herbicidas que con los tratamientos que tenían un solo herbicida, lo cual se debe al mejor control de malezas con estos tratamientos.

Keywords

AtrazineclopyralidflufenacetflumetsulamisoxaflutoleS-metolachlorcommon waterhemp, Amaranthus rudis Sauer AMATAgiant foxtail, Setaria faberi Herrm. SETFAivyleaf morningglory, Ipomoea hederacea Jacq. IPOHElarge crabgrass, Digitaria sanguinalis (L.) Scop. DIGSAPalmer amaranth, Amaranthus palmeri S. Wats. AMAPAcorn, Zea mays L.Application techniqueherbicidescorn
Type
Weed Management—Major Crops
Information
Weed Technology , Volume 26 , Issue 2 , June 2012 , pp. 220 - 229
Copyright
Copyright © Weed Science Society of America 

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