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Identification of a paraquat-resistant goosegrass (Eleusine indica) population from a central Alabama vegetable production field

Published online by Cambridge University Press:  01 July 2021

J. Scott McElroy Open the ORCID record for J. Scott McElroy [Opens in a new window] ,
James R. Harris ,
Andrew Price ,
Alex Harkess  and
Xiao Li
J. Scott McElroy*
Affiliation:
Professor, Department of Crop, Soil, and Environmental Sciences, Auburn University, Auburn, AL, USA
James R. Harris
Affiliation:
Research Associate, Department of Crop, Soil, and Environmental Sciences, Auburn University, Auburn, AL, USA
Andrew Price
Affiliation:
Research Scientist, USDA-ARS Soil Dynamics Lab, Auburn, Al, USA
Alex Harkess
Affiliation:
Assistant Professor, Department of Crop, Soil, and Environmental Sciences, Auburn University, Auburn, AL, USA
Xiao Li
Affiliation:
Assistant Professor, Department of Crop, Soil, and Environmental Sciences, Auburn University, Auburn, AL, USA
*
Author for correspondence: J. Scott McElroy, Department of Crop, Soil, and Environmental Sciences, Auburn University, 201 Funchess Hall, Auburn, AL36849. (Email: [email protected])
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Abstract

A goosegrass [Eleusine indica (L.) Gaertn.] population uncontrolled by paraquat (R) in a vegetable production field in St. Clair County, AL, was collected in summer 2019. Research was conducted to assess the level of resistance of the suspected resistant population compared with three populations with no suspected paraquat resistance (S1, S2, and S3). Visual injury at all rating dates and biomass reduction at 28 d after treatment (DAT) of S populations occurred exponentially to increasing paraquat rates. S biotypes were injured more than R at 3 DAT, with biomass recovery at 28 DAT only occurring at rates <0.28 kg ha−1. Plant death or biomass reduction did not occur for any rate at any date for R. Paraquat rates that induced 50% or 90% injury or reduced biomass 50% or 90% compared with the non-treated (I50 or I90, respectively) ranged from 10 to 124 times higher I50 for R compared with S and 54 to 116 times higher I90 for R compared with S biotypes. These data confirm a paraquat-resistant E. indica biotype in Alabama, providing additional germplasm for study of resistance to photosystem I electron-diverting (PSI-ED) resistance mechanisms.

Keywords

Herbicide resistanceoxidative stressphotosystem I
Type
Research Article
Information
Weed Science , Volume 69 , Issue 6 , November 2021 , pp. 648 - 652
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Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of the Weed Science Society of America

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Footnotes

Associate Editor: Mithila Jugulam, Kansas State University

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