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Tolpyralate Efficacy: Part 1. Biologically Effective Dose of Tolpyralate for Control of Annual Grass and Broadleaf Weeds 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 Professors, Department of Plant Agriculture, University of Guelph Ridgetown Campus, Ridgetown, ON, Canada
Darren E. Robinson
Affiliation:
Associate Professors, 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 4-hydroxyphenyl-pyruvate dioxygenase (HPPD)-inhibiting herbicide for POST weed management in corn; however, there is limited information regarding its efficacy. Six field studies were conducted in Ontario, Canada, over 3 yr (2015 to 2017) to determine the biologically effective dose of tolpyralate for the control of eight annual weed species. Tolpyralate was applied POST at six doses from 3.75 to 120 g ai ha−1 and tank mixed at a 1:33.3 ratio with atrazine at six doses from 125 to 4,000 g ha−1. Regression analysis was performed to determine the effective dose (ED) of tolpyralate, and tolpyralate+atrazine, required to achieve 50%, 80%, or 90% control of eight weed species at 1, 2, 4, and 8 wk after application (WAA). The ED of tolpyralate for 90% control (ED90) of velvetleaf, common lambsquarters, common ragweed, redroot pigweed or Powell amaranth, and green foxtail at 8 WAA was ≤15.5 g ha−1; however, tolpyralate alone did not provide 90% control of wild mustard, barnyardgrass, or ladysthumb at 8 WAA at any dose evaluated in this study. In contrast, the ED90 for all species in this study with tolpyralate+atrazine was ≤13.1+436 g ha−1, indicating that tolpyralate+atrazine can be highly efficacious at low field doses.

Keywords

Mark J. VanGessel, University of DelawareAtrazinetolpyralatebarnyardgrassEchinochloa crus-galli (L.) P. Beauv. ECHCGcommon lambsquartersChenopodium album L. CHEALcommon ragweedAmbrosia artemisiifolia L. AMBELgreen foxtailSetaria viridis (L.) P. Beauv. SETVIladysthumbPersicaria maculosa Gray POLPEPowell amaranthAmaranthus powelli S. Watson AMAPOredroot pigweedAmaranthus retroflexus L. AMAREvelvetleafAbutilon theophrasti Medik. ABUTHwild mustardSinapis arvensis L. SINARcornZea mays L.Dose responsehydroxyphenyl-pyruvate dioxygenase (HPPD)HPPD-inhibiting herbicidesphotosystem II-inhibiting herbicides
Type
Research Article
Information
Weed Technology , Volume 32 , Issue 6 , December 2018 , pp. 698 - 706
Copyright
© Weed Science Society of America, 2018. 

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