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Accepted manuscript

Confirmation of glyphosate-resistant waterhemp (Amaranthus tuberculatus) in New York

Published online by Cambridge University Press:  13 January 2025

Vipan Kumar Open the ORCID record for Vipan Kumar [Opens in a new window] ,
Jatinder Aulakh ,
Mike Stanyard ,
Mike Hunter ,
Bryan Brown ,
Lynn Sosnoskie  and
Amit J. Jhala
Vipan Kumar*
Affiliation:
Associate Professor, Cornell University, School of Integrative Plant Science, Soil and Crop Sciences Section, Ithaca, NY, USA
Jatinder Aulakh
Affiliation:
Associate Weed Scientist, Connecticut Agricultural Experiment Station, Windsor, CT, USA
Mike Stanyard
Affiliation:
Senior Extension Associate, Cornell University, Cornell Cooperative Extension, Newark, NY, USA
Mike Hunter
Affiliation:
Field Crops IPM Specialist, Cornell University, New York State Integrated Pest Management, Geneva, NY, USA
Bryan Brown
Affiliation:
Senior Extension Associate, Cornell University, New York State Integrated Pest Management, Geneva, NY, USA
Lynn Sosnoskie
Affiliation:
Assistant Professor, Cornell University, School of Integrative Plant Science, Soil and Crop Sciences Section, Horticulture Section, Geneva, NY, USA
Amit J. Jhala
Affiliation:
Professor and Associate Department Head, University of Nebraska, Department of Agronomy and Horticulture, Lincoln, NE, USA
*
*Author for correspondence: Vipan Kumar, Associate Professor, Cornell University, School of Integrative Plant Science, Soil and Crop Sciences Section, 1115 Bradfield Hall, Ithaca, NY 14853. Email: vk364@cornell.edu
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Abstract

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Waterhemp has become a serious management challenge for New York (NY) field crop growers. Two putative glyphosate-resistant (GR) waterhemp populations (NY1 and NY2) were collected in 2023 from two soybean fields in Seneca County, NY. The objectives of this research were to (1) confirm and characterize the level of glyphosate resistance in waterhemp populations from NY relative to a known glyphosate-susceptible Nebraska (NE_SUS) population and (2) evaluate the efficacy of various postemergence (POST) herbicides for GR waterhemp control. Based on the shoot dry weight reductions (GR50 values) in a dose-response study, the NY1 and NY2 populations exhibited 5.6- to 8.3-fold resistance to glyphosate compared with the NE_SUS population. In a separate study, POST herbicides such as dicamba, glufosinate, lactofen, and 2,4-D applied alone or in a mixture with glyphosate or glufosinate had provided 89% to 99% control and ≥ 97% shoot dry weight reduction of NY1 and NY2 populations 21 days after treatment (DAT). Greater than 98% control of the NE_SUS population was achieved with tested POST herbicides, except mesotrione (62% control). Furthermore, atrazine, chlorimuron + thifensulfuron, and mesotrione were the least effective in controlling NY1 and NY2 populations (42% to 59% control and 50% to 67% shoot dry weight reductions, respectively). These results confirm the first report of GR waterhemp in NY. Growers should adopt effective alternative POST herbicides tested in this study to manage GR waterhemp.

Keywords

GlyphosatesoybeanNew York
Type
Research Article
Information
Weed Technology , Accepted manuscript , pp. 1 - 19
Creative Commons
Creative Common License - CCCreative Common License - BYCreative Common License - NCCreative Common License - ND
This is an Open Access article, distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives licence (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is unaltered and is properly cited. The written permission of Cambridge University Press must be obtained for commercial re-use or in order to create a derivative work.
Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of Weed Science Society of America