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Identification of Goosegrass (Eleusine indica) Biotypes Resistant to Preemergence-Applied Oxadiazon

Published online by Cambridge University Press:  24 August 2017

J. Scott McElroy ,
William B. Head ,
Glenn R. Wehtje  and
David Spak
J. Scott McElroy*
Affiliation:
Professor, Graduate Research Assistant, and Professor, Department of Crop, Soil, and Environmental Sciences, Auburn University, Auburn, AL 36849; Herbicide Product Development Manager, Bayer Cropscience, 2 T.W. Alexander Drive, Research Triangle Park, NC 27709
William B. Head
Affiliation:
Professor, Graduate Research Assistant, and Professor, Department of Crop, Soil, and Environmental Sciences, Auburn University, Auburn, AL 36849; Herbicide Product Development Manager, Bayer Cropscience, 2 T.W. Alexander Drive, Research Triangle Park, NC 27709
Glenn R. Wehtje
Affiliation:
Professor, Graduate Research Assistant, and Professor, Department of Crop, Soil, and Environmental Sciences, Auburn University, Auburn, AL 36849; Herbicide Product Development Manager, Bayer Cropscience, 2 T.W. Alexander Drive, Research Triangle Park, NC 27709
David Spak
Affiliation:
Professor, Graduate Research Assistant, and Professor, Department of Crop, Soil, and Environmental Sciences, Auburn University, Auburn, AL 36849; Herbicide Product Development Manager, Bayer Cropscience, 2 T.W. Alexander Drive, Research Triangle Park, NC 27709
*
*Corresponding author’s E-mail: jsm0010@auburn.edu
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Abstract

Goosegrass biotypes from golf courses in Richmond, VA (CCV) and New Bern, NC (RB) historically treated with oxadiazon were identified as resistant compared to susceptible standard (PBU) based on comparisons of oxadiazon applied preemergence at increasing rates (0.03 to 2.24 kg ha-1). Oxadiazon at rates ≤ 2.24 kg ha-1 rate did not prevent emergence of suspected resistant CCV and RB seedlings. PBU emergence was completely prevented at 0.14 kg ha-1. Based on percent seedling emergence relative to non-treated and percent above-ground biomass reduction relative to non-treated, the oxadiazon rate at which emergence would be reduced 50% (I50) or 90% (I90) ranged from 0.12 to 0.18 kg ha-1 or 10.83 to 85.57 kg ha-1, respectively for suspected resistant CCV and RB, compared to 0.03 to 0.4 kg ha-1 or 0.12 to 0.19 kg ha-1, respectively for susceptible standard PBU. Seedling emergence data predicted 7.9 and 3.0 times greater I90 values for CCV and RB, respectively compared to biomass data. All three biotypes were completely controlled by preemergence applied labeled rates of prodiamine and indaziflam. This is the first peer-reviewed report of evolved weed resistance to oxadiazon.

Keywords

Oxadiazongoosegrass, Eleusine indica (L.) Gaertn. ELEIN.Herbicide resistanceturfgrassweed evolution.
Type
Weed Management-Other Crops/Areas
Information
Weed Technology , Volume 31 , Issue 5 , October 2017 , pp. 675 - 681
Copyright
© Weed Science Society of America, 2017 

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Footnotes

Associate Editor for this paper: Patrick E. McCullough, University of Georgia.

References

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