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Tolpyralate Efficacy: Part 2. Comparison of Three Group 27 Herbicides Applied POST for Annual Grass and Broadleaf Weed Control in Corn

Published online by Cambridge University Press:  21 December 2018

Brendan A. Metzger ,
Nader Soltani ,
Alan J. Raeder ,
David C. Hooker ,
Darren E. Robinson  and
Peter H. Sikkema
Brendan A. Metzger
Affiliation:
Graduate Student, Department of Plant Agriculture, University of Guelph Ridgetown Campus, Ridgetown, ON, Canada
Nader Soltani*
Affiliation:
Adjunct Professor, Department of Plant Agriculture, University of Guelph Ridgetown Campus, Ridgetown, ON, Canada
Alan J. Raeder
Affiliation:
Herbicide Field Development and Technical Service Representative, ISK Biosciences Inc., Concord, OH, USA
David C. Hooker
Affiliation:
Associate Professor, Department of Plant Agriculture, University of Guelph Ridgetown Campus, Ridgetown, ON, Canada
Darren E. Robinson
Affiliation:
Associate Professor, Department of Plant Agriculture, University of Guelph Ridgetown Campus, Ridgetown, ON, Canada
Peter H. Sikkema
Affiliation:
Professor, Department of Plant Agriculture, University of Guelph Ridgetown Campus, Ridgetown, ON, Canada
*
*Author for correspondence: Nader Soltani, Department of Plant Agriculture, University of Guelph Ridgetown Campus, Ridgetown, ON N0P 2C0, Canada. (Email: soltanin@uoguelph.ca)
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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 1 WAA. 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.

Keywords

David Johnson, Pioneer/DuPontAtrazinemesotrionetolpyralatetopramezonebarnyardgrassEchinochloa crus-galli (L.) P. Beauv. ECHCGcommon lambsquartersChenopdium album L. CHEALcommon ragweedAmbrosia artemisiifolia L. AMBELgreen foxtailSetaria viridis (L.) P. Beauv. SETVIladysthumbPersicaria maculosa Gray. POLPEPowell amaranthAmaranthus powelli S. Watson AMAPOredroot pigweedAmaranthus retroflexus L. AMARE; pigweed spp.Amaranthus spp.AMASSvelvetleafAbutilon theophrasti Medik. ABUTHwild mustardSinapis arvensis L. SINARcornZea mays L4-hydroxyphenyl-pyruvate dioxygenasebiomassdensityHPPD-inhibiting herbicidesweed control
Type
Research Article
Information
Weed Technology , Volume 32 , Issue 6 , December 2018 , pp. 707 - 713
Copyright
© Weed Science Society of America, 2018. 

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