This is the first record of protoporphyrinogen oxidase (PPO) inhibitor resistance in eastern Canada, and the second record of a glyphosate-resistant weed in Quebec. In 2016 and 2017, waterhemp seed was collected from 25 locations across Ontario and Quebec. All populations tested positive for imazethapyr resistance. Three-way resistance to imazethapyr, atrazine, and glyphosate was confirmed in 80% of the samples. Additionally, between 2015 and 2017, waterhemp seed was collected from 74 locations in Ontario or Quebec and resistance to lactofen was confirmed in 28% of the seed lots screened.
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21 November 2019
The first record of protoporphyrinogen oxidase and four-way herbicide resistance in eastern Canada
Lauren Benoit,
Brittany Hedges,
Mike G. Schryver,
Nader Soltani,
David C. Hooker,
Darren E. Robinson,
Martin Laforest,
Brahim Soufiane,
Patrick J. Tranel,
Darci Giacomini,
Peter H. Sikkema
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Canadian Journal of Plant Science
Vol. 100 • No. 3
June 2020
Vol. 100 • No. 3
June 2020
Glyphosate resistance
multiple-resistant
protoporphyrinogen oxidase inhibitors
waterhemp
