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A linuron-free weed management strategy for carrots

Published online by Cambridge University Press:  22 March 2019

Tessa de Boer ,
Peter Smith ,
Kevin Chandler ,
Robert Nurse ,
Kristen Obeid  and
Clarence Swanton Open the ORCID record for Clarence Swanton [Opens in a new window]
Tessa de Boer
Affiliation:
Graduate Student, Department of Plant Agriculture, University of Guelph, Guelph, ON, Canada
Peter Smith
Affiliation:
Technician, Department of Plant Agriculture, University of Guelph, Guelph, ON, Canada
Kevin Chandler
Affiliation:
Technician, Department of Plant Agriculture, University of Guelph, Guelph, ON, Canada
Robert Nurse
Affiliation:
Agriculture and Agri-food Canada, Harrow, ON, Canada
Kristen Obeid
Affiliation:
Weed Management Specialist, Horticulture, Ontario Minister of Food, Agriculture, and Rural Affairs, Harrow, ON, Canada
Clarence Swanton*
Affiliation:
Professor, Department of Plant Agriculture, University of Guelph, Guelph, ON, Canada
*
*Author for correspondence: Clarence Swanton, Department of Plant Agriculture, University of Guelph, Guelph, ON, Canada N1G 2W1. (Email: cswanton@uoguelph.ca)
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Abstract

The development of a linuron-free weed management strategy for carrot production is essential as a result of the herbicide reevaluation programs launched by the Pest Management Regulatory Agency in Canada for herbicides registered before 1995 and the discovery of linuron-resistant pigweed species in Ontario. Field trials were conducted in one of Ontario’s main carrot-growing regions on high organic soils in 2016 and 2017. Pigweed species seedlings were effectively controlled with PRE treatments of prometryn, pendimethalin, S-metolachlor, or glufosinate. POST treatments of pyroxasulfone and metribuzin followed by predetermined biologically effective dose (≥90% control of pigweed seedlings) of acifluorfen, oxyfluorfen, fluthiacet-methyl, and fomesafen achieved excellent crop selectivity and commercially acceptable pigweed species seedling control under field conditions. Carfentrazone-ethyl or fomesafen applied PRE severely reduced seedling emergence and yield in the wet growing season of 2017. This study demonstrated clearly that an alternative linuron-free strategy can be developed for carrots. The strategy of exploring the potential to use the biologically effective dose of selected herbicides to achieve crop selectivity and control of pigweed species seedlings was verified.

Keywords

Darren Robinson, University of GuelphAcifluorfencarfentrazone-ethylfluthiacet-methylfomesafenglufosinatelinuronmetribuzinoxyfluorfenpendimethalinprometrynpyroxasulfoneS-metolachlorpigweed species, Amaranthus spp.carrot, Daucus carota L.Biologically effective dosecarrot growthcritical weed-free periodseedling emergence
Type
Research Article
Information
Weed Technology , Volume 33 , Issue 3 , June 2019 , pp. 464 - 474
Copyright
© Weed Science Society of America, 2019 

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