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Evaluation of Flufenacet plus Metribuzin Mixtures for Control of Italian Ryegrass in Winter Wheat

Published online by Cambridge University Press:  20 January 2017

Rebecca M. Koepke-Hill
Plant Sciences Department, University of Tennessee, Knoxville, TN 37996
Gregory R. Armel*
Plant Sciences Department, University of Tennessee, Knoxville, TN 37996
Kevin W. Bradley
Plant Sciences, University of Missouri, Columbia, MO 65211
William A. Bailey
Plant and Soil Sciences Department, University of Kentucky, Princeton, KY 42445
Henry P. Wilson
Eastern Shore Agricultural Research and Extension Center, Virginia Polytechnic Institute and State University, Painter, VA 23420
Thomas E. Hines
Eastern Shore Agricultural Research and Extension Center, Virginia Polytechnic Institute and State University, Painter, VA 23420
Corresponding author's E-mail:


Field studies were conducted to compare the effectiveness of PRE and POST applications of a prepackaged mixture of flufenacet plus metribuzin with that of diclofop for winter wheat tolerance and control of Italian ryegrass. Additional studies investigated the effectiveness of reduced rates of flufenacet plus metribuzin applied POST to Italian ryegrass when wheat was in the spike stage. All PRE and POST applications of flufenacet plus metribuzin produced similar or greater injury to wheat and more consistent control of Italian ryegrass than PRE or POST applications of diclofop. PRE applications of flufenacet plus metribuzin controlled Italian ryegrass 73 to 77%, whereas POST applications controlled Italian ryegrass 77 to 99%. PRE applications of diclofop controlled Italian ryegrass 57%; POST application controlled Italian ryegrass 78%. Wheat injury from flufenacet plus metribuzin applications varied with application rate, cultivar, and year of application.

Se realizaron estudios de campo para comparar la efectividad de aplicaciones pre-emergentes (PRE) y post-emergentes (POST) de una mezcla comercial de flufenacet más metribuzin con la de diclofop, para tolerancia en trigo de invierno (Triticum aestivum) y control de Lolium multiflorum. Estudios adicionales investigaron la efectividad de dosis reducidas de flufenacet más metribuzin aplicados POST a L. multiflorum, cuando el trigo estaba en la etapa de espigamiento. Todas las aplicaciones PRE y POST de flufenacet más metribuzin causaron daño similar o mayor al trigo y un control más consistente de L. multiforum que las aplicaciones PRE o POST de diclofop. Las aplicaciones PRE de flufenacet más metribuzin controlaron L. multiflorum 73 a 77%, mientras que las aplicaciones POST controlaron ésta gramínea de 77 a 99%. Las aplicaciones PRE de diclofop controlaron L. multiflorum en 57%, mientras que las aplicaciones POST la controlaron 78%. El daño al trigo causado por las aplicaciones de flufenacet más metribuzin variaron con la dosis de aplicación, el cultivar y el año de aplicación.

Weed Management—Major Crops
Copyright © Weed Science Society of America 

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