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Control and Distribution of Multiple-Herbicide-Resistant Waterhemp (Amaranthus tuberculatus (Moq.) J. D. Sauer) in Corn (Zea mays L.) in Ontario

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Title: Control and Distribution of Multiple-Herbicide-Resistant Waterhemp (Amaranthus tuberculatus (Moq.) J. D. Sauer) in Corn (Zea mays L.) in Ontario
Author: Willemse, Christian
Department: Department of Plant Agriculture
Program: Plant Agriculture
Advisor: Sikkema, Peter
Abstract: Field surveys in 2019 and 2020 identified multiple-herbicide-resistant (MHR) waterhemp populations resistant to acetolactate synthase (ALS)-, photosystem II (PS II)-, 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS)-, and protoporphyrinogen IX oxidase (PPO)-inhibitors in the additional counties of Bruce, Elgin, Haldimand, Huron, Norfolk, Northumberland, and Wentworth. Several PRE, EPOST, POST and PRE fb POST herbicide programs were evaluated for control of MHR waterhemp in corn. The PRE application of S-metolachlor/mesotrione/bicyclopyrone/atrazine and saflufenacil/dimethenamid-P controlled MHR waterhemp ≥ 95%. Several ePOST applications including glyphosate + S-metolachlor/mesotrione/bicyclopyrone/atrazine, glyphosate/2,4-D choline + rimsulfuron + mesotrione + atrazine, and glyphosate + S-metolachlor/atrazine/mesotrione controlled MHR waterhemp 90% to 100%. The POST application of atrazine + isoxaflutole, mesotrione, tembotrione, topramezone, or tolpyralate controlled MHR waterhemp 81% to 99%. A POST application of glufosinate following tolpyralate + atrazine PRE, and a POST application of mesotrione + atrazine following dicamba/atrazine or S-metolachlor/atrazine PRE, increased MHR waterhemp control 5% to 37%.
URI: https://hdl.handle.net/10214/24094
Date: 2021-02
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Related Publications: Willemse, C., Soltani, N., Benoit, L., Hooker, D., Jhala, A., Robinson, D., & Sikkema, P. (2020). Herbicide Programs for Control of Waterhemp (Amaranthus tuberculatus) Resistant to Three Distinct Herbicide Sites of Action in Corn. Weed Technology, 1-28. doi:10.1017/wet.2020.140


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