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Different Glyphosate Susceptibility in Chloris polydactyla Accessions

Published online by Cambridge University Press:  20 January 2017

Arthur A. M. Barroso*
Affiliation:
Department of Crop Production, São Paulo University, USP, São Paulo, Brazil
Alfredo J. P. Albrecht
Affiliation:
Department of Crop Production, São Paulo University, USP, São Paulo, Brazil
Fabricia C. Dos Reis
Affiliation:
Department of Crop Production, São Paulo University, USP, São Paulo, Brazil
Henrique F. Placido
Affiliation:
Paraná Federal University, Paraná, Brazil
Roberto E. Toledo
Affiliation:
FMC Agricultural Solutions and HRAC-BR, Piracicaba, Brazil
Leandro P. Albrecht
Affiliation:
Paraná Federal University, Paraná, Brazil
Ricardo V. Filho
Affiliation:
Department of Crop Production, São Paulo University, USP, São Paulo, Brazil
*
Corresponding author's E-mail: arthuragro07@hotmail.com.
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Abstract

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Glyphosate is now the most widely used herbicide; after years of frequent utilization, resistant weeds were selected, mainly due to widespread adoption of glyphosate-resistant crops and no-tillage sowing system. Increasing difficulty in controlling Chloris polydactyla with glyphosate has been noticed in agricultural areas. Here, the susceptibility level of various C. polydactyla accessions from Brazil is examined. Two whole-plant studies were conducted to confirm the presence and extent of glyphosate susceptibility among accessions, which involved the application of seven glyphosate doses on four accessions. The four accessions showed different glyphosate susceptibilities. The “Matão” accession presented major tolerance for glyphosate compared to “Palotina” accessions. “Jaboticabal” plants showed an intermediary susceptibility. The resistance factor (RF) was 3.76 between the “Matão” and “Palotina” accessions. All biotypes died at 2,880 g ae ha−1 glyphosate.

Glyphosate es actualmente el herbicida más ampliamente usado. Después de años de uso frecuente, malezas resistentes fueron seleccionadas, principalmente debido a la amplia adopción de cultivos resistentes a glyphosate y de sistemas de siembra con labranza cero. En áreas agrícolas, se ha notado el incremento en la dificultad para controlar Chloris polydactyla con glyphosate. Aquí, se examinó el nivel de susceptibilidad de varias accesiones de C. polydactyla de Brasil. Dos estudios de plantas enteras fueron realizados para confirmar la presencia y la magnitud de la susceptibilidad a glyphosate entre accesiones, los cuales involucraron la aplicación de siete dosis de glyphosate sobre cuatro accesiones. Las cuatro accesiones mostraron diferentes susceptibilidades a glyphosate. La accesión “Matão” presentó una tolerancia mayor al compararse con la accesión “Palotina”. Las plantas de “Jaboticabal” mostraron una susceptibilidad intermedia. El factor de resistencia (RF) fue 3.76 entre las accesiones “Matão” y “Palotina”. Todos los biotipos murieron al ser expuestos a 2,880 g ae ha−1 de glyphosate.

Information

Type
Research Article
Copyright
Copyright © Weed Science Society of America