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1 December 2018 Tolpyralate Efficacy: Part 2. Comparison of Three Group 27 Herbicides Applied POST for Annual Grass and Broadleaf Weed Control in Corn
Brendan A. Metzger, Nader Soltani, Alan J. Raeder, David C. Hooker, Darren E. Robinson, Peter H. Sikkema
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Abstract

Tolpyralate is a new Group 27 pyrazolone herbicide that inhibits the 4-hydroxyphenyl-pyruvate dioxygenase enzyme. In a study of the biologically effective dose of tolpyralate from 2015 to 2017 in Ontario, Canada, tolpyralate exhibited efficacy on a broader range of species when co-applied with atrazine; however, there is limited published information on the efficacy of tolpyralate and tolpyralate + atrazine relative to mesotrione and topramezone, applied POST with atrazine at label rates, for control of annual grass and broadleaf weeds. In this study, tolpyralate applied alone at 30 g ai ha-1 provided >90% control of common lambsquarters, velvetleaf, common ragweed, Powell amaranth/redroot pigweed, and green foxtail at 8 weeks after application (WAA). Addition of atrazine was required to achieve >90% control of wild mustard, ladysthumb, and barnyardgrass at 8 WAA. Tolpyralate + atrazine (30 + 1,000 g ai ha-1) and topramezone + atrazine (12.5 + 500 g ai ha-1) provided similar control at 8 WAA of the eight weed species in this study; however, tolpyralate + atrazine provided >90% control of green foxtail by 1WAA.Tolpyralate + atrazine provided 18, 68, and 67 percentage points better control of common ragweed, green foxtail, and barnyardgrass, respectively, than mesotrione + atrazine (100 + 280 g ai ha-1) at 8 WAA. Overall, tolpyralate + atrazine applied POST provided equivalent or improved control of annual grass and broadleaf weeds compared with mesotrione + atrazine and topramezone + atrazine.

Nomenclature: Atrazine; mesotrione; tolpyralate; topramezone; barnyardgrass, Echinochloa crus-galli (L.) P. Beauv. ECHCG; common lambsquarters, Chenopdium album L. CHEAL; common ragweed, Ambrosia artemisiifolia L. AMBEL; green foxtail, Setaria viridis (L.) P. Beauv. SETVI; ladysthumb, Persicaria maculosa Gray. POLPE; Powell amaranth, Amaranthus powelli S. Watson AMAPO; redroot pigweed, Amaranthus retroflexus L. AMARE; pigweed spp., Amaranthus spp., AMASS; velvetleaf, Abutilon theophrasti Medik. ABUTH; wild mustard, Sinapis arvensis L. SINAR; corn, Zea mays L

© Weed Science Society of America, 2018.
Brendan A. Metzger, Nader Soltani, Alan J. Raeder, David C. Hooker, Darren E. Robinson, and Peter H. Sikkema "Tolpyralate Efficacy: Part 2. Comparison of Three Group 27 Herbicides Applied POST for Annual Grass and Broadleaf Weed Control in Corn," Weed Technology 32(6), 707-713, (1 December 2018). https://doi.org/doi: 10.1017/wet.2018.81
Received: 11 May 2018; Accepted: 14 August 2018; Published: 1 December 2018
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KEYWORDS
4-hydroxyphenyl-pyruvate dioxygenase
biomass
density
HPPD-inhibiting herbicides
weed control
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