Efficacy of HPPD-inhibiting herbicides applied preemergence or postemergence for control of multiple herbicide resistant waterhemp [Amaranthus tuberculatus (Moq.) Sauer]

Lauren Benoit; Nader Soltani; David C. Hooker; Darren E. Robinson; Peter H. Sikkema

doi:10.1139/cjps-2018-0320

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5 March 2019 Efficacy of HPPD-inhibiting herbicides applied preemergence or postemergence for control of multiple herbicide resistant waterhemp [Amaranthus tuberculatus (Moq.) Sauer]

Lauren Benoit, Nader Soltani, David C. Hooker, Darren E. Robinson, Peter H. Sikkema

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Canadian J. of Plant Science, 99(3):379-383 (2019). https://doi.org/10.1139/cjps-2018-0320

Abstract

Research was conducted in 2017 and 2018 to determine the relative efficacy of five HPPD-inhibitors, tank-mixed with atrazine, for the control of multiple herbicide resistant waterhemp. At 12 wk after application (WAA), isoxaflutole + atrazine, mesotrione + atrazine, and tembotrione + atrazine, applied preemergence (PRE), controlled waterhemp 90%, 87%, and 81%, respectively. None of the HPPD-inhibiting herbicides applied PRE controlled waterhemp similar to the weed-free control 12 WAA. Applied postemergence, topramezone + atrazine, mesotrione + atrazine, tolpyralate + atrazine, and tembotrione + atrazine controlled waterhemp 87%, 94%, 97%, and 98% 12 WAA, respectively, and were all similar to the weed-free control.

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Lauren Benoit, Nader Soltani, David C. Hooker, Darren E. Robinson, and Peter H. Sikkema "Efficacy of HPPD-inhibiting herbicides applied preemergence or postemergence for control of multiple herbicide resistant waterhemp [Amaranthus tuberculatus (Moq.) Sauer]," Canadian Journal of Plant Science 99(3), 379-383, (5 March 2019). https://doi.org/10.1139/cjps-2018-0320

Received: 11 December 2018; Accepted: 13 February 2019; Published: 5 March 2019

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