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Suppression of Glyphosate-resistant Canada Fleabane (Conyza canadensis) in Corn with Cover Crops Seeded after Wheat Harvest the Previous Year

Published online by Cambridge University Press:  22 March 2018

Taïga B. Cholette ,
Nader Soltani ,
David C. Hooker ,
Darren E. Robinson  and
Peter H. Sikkema
Taïga B. Cholette
Affiliation:
Former 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
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. (Email: soltanin@uoguelph.ca)
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Abstract

Glyphosate-resistant (GR) and multiple herbicide–resistant (groups 2 and 9) Canada fleabane have been confirmed in 30 and 23 counties in Ontario, respectively. The widespread incidence of herbicide-resistant Canada fleabane highlights the importance of developing integrated weed management strategies. One strategy is to suppress Canada fleabane using cover crops. Seventeen different cover crop monocultures or polycultures were seeded after winter wheat harvest in late summer to determine GR Canada fleabane suppression in corn grown the following growing season. All cover crop treatments seeded after wheat harvest suppressed GR Canada fleabane in corn the following year. At 4 wk after cover crop emergence (WAE), estimated cover crop ground cover ranged from 31% to 68%, a density of 124 to 638 plants m–2, and a range of biomass from 29 to 109 g m–2, depending on cover crop species. All of the cover crop treatments suppressed GR Canada fleabane in corn grown the following growing season from May to September compared to the no cover crop control. Among treatments evaluated, annual ryegrass (ARG), crimson clover (CC)/ARG, oilseed radish (OSR)/CC/ARG, and OSR/CC/cereal rye (CR) were the best treatments for the suppression of GR Canada fleabane in corn. ARG alone or in combination with CC provided the most consistent GR Canada fleabane suppression, density reduction, and biomass reduction in corn. Grain corn yields were not affected by the use of the cover crops evaluated for Canada fleabane suppression.

Keywords

William Johnson, Purdue UniversityGlyphosateCanada fleabane, Conyza canadensis Cronq.annual ryegrass, Lolium multiflorum Lam.cereal rye, Secale cereale L.corn, Zea mays L.crimson clover, Trifolium incarnatum L.oilseed radish, Raphanus sativus L.winter wheat, Triticum aestivum L.Biomasscover cropsdensityinjuryyield
Type
Weed Management-Techniques
Information
Weed Technology , Volume 32 , Issue 3 , June 2018 , pp. 244 - 250
Copyright
© Weed Science Society of America, 2017 

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