Hostname: page-component-857557d7f7-zntvd Total loading time: 0 Render date: 2025-11-21T08:13:56.957Z Has data issue: false hasContentIssue false
Accepted manuscript

Control of Glyphosate-Resistant Waterhemp (Amaranthus tuberculatus) in Dicamba -Resistant Soybean in New York

Published online by Cambridge University Press:  21 November 2025

Midhat Z. Tugoo
Affiliation:
Graduate Research Assistant, Cornell University, School of Integrative Plant Science, Soil and Crop Sciences Section, Ithaca, NY, USA
Bryan Brown
Affiliation:
Senior Extension Associate, Cornell Integrated Pest Management, Adjunct Assistant Professor, Cornell University, School of Integrative Plant Science, Horticulture Section, Ithaca, NY, 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
Vipan Kumar*
Affiliation:
Associate Professor, Cornell University, School of Integrative Plant Science, Soil and Crop Sciences Section, Ithaca, NY, USA
*
*Corresponding Author: Vipan Kumar, Associate Professor, Cornell University, School of Integrative Plant Science, Soil and Crop Sciences Section, Ithaca, NY, USA. Email: vk364@cornell.edu
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Recent reports of glyphosate-resistant (GR) waterhemp pose serious concerns among New York (NY) producers. Field experiments were conducted in 2019 and 2020 near Waterloo, NY, to evaluate the effectiveness of preemergence (PRE), postemergence (POST), PRE followed by (fb) POST, and PRE fb row cultivation (RC) for GR waterhemp control in dicamba-resistant (DR) soybean. In 2019, all two-pass programs significantly reduced GR waterhemp densities (2 to 13 plants m-2) as compared to nontreated (160 plant m-2) at 8 weeks after PRE (WAPRE)/2 weeks after POST (WAPOST), shoot dry biomass (85 to 99% of nontreated) and resulted in greater soybean grain yields (2,659 to 2,936 kg ha-1). In addition, flumioxazin, acetochlor, chlorimuron + flumioxazin + metribuzin, acetochlor + fomesafen + metribuzin, carfentrazone + sulfentrazone + metribuzin and S-metolachlor + sulfentrazone + metribuzin applied PRE resulted in significant reductions in GR waterhemp density (3 to 19 plants m-2) and shoot dry biomass (60 to 98% of nontreated). In 2020, most PRE (except cloransulam), POST only or PRE fb POST strategies reduced densities of GR waterhemp (1 to 46 plants m-2) as compared to nontreated (104 plants m-2) at 8 WAPRE/ 2WAPOST and shoot dry biomass (66 to 99% of nontreated). All two-pass strategies as well as metribuzin, acetochlor + fomesafen + metribuzin, carfentrazone + sulfentrazone applied PRE resulted in higher grain yields (3,343 to 4,244 kg ha-1). These results conclude that two-pass strategies tested in this research can consistently provide effective control of GR waterhemp in DR soybean in NY.

Information

Type
Research Article
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