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

Willemse, Christian

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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

descriptionPublicationkeyboard_double_arrow_right Thesis 17 Dec 2020 Canada English Publisher:University of Guelph

Authors: Willemse, Christian;

handle: 10214/24094

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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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%.

Country

Canada

Related Organizations

University of Guelph
Canada

Keywords

Glufosinate, EPOST herbicides, S-metolachlor, Weed management, Dimethenamid-P, Bicyclopyrone, Mesotrione, Multiple modes of action, Saflufenacil, PRE herbicides, Atrazine, Tolpyralate, POST herbicides, Corn, Zea mays L., Isoxaflutole, PRE followed by POST herbicides

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