International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
HRAC GROUP 22 (LEGACY D) RESISTANT VIRGINIA PEPPERWEED
(Lepidium virginicum)


PS I Electron Diversion HRAC Group 22 (Legacy D)

Canada, Ontario
INTRODUCTION VIRGINIA PEPPERWEED
Virginia Pepperweed (Lepidium virginicum) is a dicot weed in the Brassicaceae family.  In Ontario this weed first evolved resistance to Group 22 (Legacy D) herbicides in 1993 and infests Peaches.   Group 22 (Legacy D) herbicides are known as PS I Electron Diversion (PSI Electron Diversion ).  Research has shown that these particular biotypes are resistant to paraquat and they may be cross-resistant to other Group 22 (Legacy D) herbicides.

The 'Group' letters/numbers that you see throughout this web site refer to the classification of herbicides by their site of action. To see a full list of herbicides and HRAC herbicide classifications click here.

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QUIK STATS (last updated Jun 06, 2000 )

Common NameVirginia Pepperweed
SpeciesLepidium virginicum
GroupPS I Electron Diversion HRAC Group 22 (Legacy D)
Herbicidesparaquat
LocationCanada, Ontario
Year1993
Situation(s)Peaches
Contributors - (Alphabetically)Susan Weaver 
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NOTES ABOUT THIS BIOTYPE

GENERAL

Hugh Beckie
A. Smisek, C. Doucet, M. Jones, and S. Weaver. 1998. Paraquat resistance in horseweed (Conyza canadensis) and Virginia pepperweed (Lepidium virginicum) from Essex County, Ontario. Weed Sci. 46:200-204.

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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse, and Laboratory trials comparing a known susceptible Virginia Pepperweed biotype with this Virginia Pepperweed biotype have been used to confirm resistance. For further information on the tests conducted please contact the local weed scientists that provided this information.
 
Genetics

Genetic studies on HRAC Group 22 resistant Virginia Pepperweed have not been reported to the site.  There may be a note below or an article discussing the genetics of this biotype in the Fact Sheets and Other Literature
 
Mechanism of Resistance

The mechanism of resistance for this biotype is either unknown or has not been entered in the database.  If you know anything about the mechanism of resistance for this biotype then please update the database.
 
Relative Fitness

There is no record of differences in fitness or competitiveness of these resistant biotypes when compared to that of normal susceptible biotypes.  If you have any information pertaining to the fitness of Group 22 (Legacy D) resistant Virginia Pepperweed from Ontario please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

SUSAN WEAVER
Agriculture And Agri-Food Canada
Greenhouse And Processing Crops Research Centre
Dept Plant Science MS4
Robbins Hall,
Harrow, NOR 1G0, Ontario
Canada
Email Susan Weaver

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Ontario have been instrumental in providing you this information. Particular thanks is given to Susan Weaver for providing detailed information.
Herbicide Resistant Virginia Pepperweed Globally
(Lepidium virginicum)
Herbicide Resistant Virginia Pepperweed Globally
(Lepidium virginicum)
Drag a column header and drop it here to group by that column
Herbicide Resistant Virginia Pepperweed Globally
(Lepidium virginicum)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Canada (Ontario) CanadaOntario1993 Peaches paraquat 7 PS I Electron Diversion ( HRAC Group 22 (Legacy D)
103Lepidium virginicumVirginia Pepperweed49
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