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Paraquat resistance in horseweed (Conyza canadensis) and Virginia pepperweed (Lepidium virginicum) from Essex County, Ontario

Published online by Cambridge University Press:  12 June 2017

Alida Smisek ,
Colleen Doucet ,
Martha Jones  and
Susan Weaver
Alida Smisek
Affiliation:
Greenhouse and Processing Crops Research Centre, Agriculture and Agri-Food Canada, Harrow, Ontario N0R 1G0, Canada
Colleen Doucet
Affiliation:
Greenhouse and Processing Crops Research Centre, Agriculture and Agri-Food Canada, Harrow, Ontario N0R 1G0, Canada
Martha Jones
Affiliation:
Greenhouse and Processing Crops Research Centre, Agriculture and Agri-Food Canada, Harrow, Ontario N0R 1G0, Canada
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Abstract

Populations of horseweed and Virginia pepperweed resistant to the herbicide paraquat were found in several fruit orchards in Essex County, Ontario, Canada, where paraquat had been applied four to five times per year for at least 10 yr. Dose–response experiments were conducted in the greenhouse for each species, using 2-to 4-mo-old plants from populations that had received repeated exposure to paraquat and those that had not. The paraquat dose that reduced shoot dry weight by 50% (ED50) was estimated for each population. Resistant populations of horseweed had ED50 values 25 to 35 times higher than susceptible populations. A resistant population of Virginia pepperweed had an ED50 10 times higher than susceptible populations.

Keywords

Paraquathorseweed, Conyza canadensis (L.) Cronq. ERICAVirginia pepperweed, Lepidium virginicum L. LEPVIED50herbicide resistancedose-responseERICALEPVI
Type
Weed Biology and Ecology
Information
Weed Science , Volume 46 , Issue 2 , April 1998 , pp. 200 - 204
Copyright
Copyright © 1998 by the Weed Science Society of America 

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