International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
(Brassica rapa (=B. campestris))

EPSP synthase inhibitors (G/9)

Canada, Quebec
Birdsrape Mustard (Brassica rapa (=B. campestris)) is a dicot weed in the Brassicaceae family.  In Quebec this weed first evolved resistance to Group G/9 herbicides in 2017 and infests Corn (maize), and Soybean.   Group G/9 herbicides are known as EPSP synthase inhibitors (Inhibition of EPSP synthase).  Research has shown that these particular biotypes are resistant to glyphosate and they may be cross-resistant to other Group G/9 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.

If we do not have a picture for this weed, or you can provide a better picture (scan, digital camera etc) please please e-mail it to us.

QUIK STATS (last updated Jan 28, 2018 )

Common NameBirdsrape Mustard
SpeciesBrassica rapa (=B. campestris)
GroupEPSP synthase inhibitors (G/9)
LocationCanada, Quebec
Situation(s)Corn (maize), and Soybean
Contributors - (Alphabetically)Martin Laforest, and Marie-Josée Simard 
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Confirmation Tests

Greenhouse trials comparing a known susceptible Birdsrape Mustard biotype with this Birdsrape Mustard biotype have been used to confirm resistance. For further information on the tests conducted please contact the local weed scientists that provided this information.

Genetic studies on Group G/9 resistant Birdsrape Mustard 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 G/9 resistant Birdsrape Mustard from Quebec please update the database.
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Research Scientist
Agriculture and Agri-food Canada
430 boul. Gouin
St-Jean-sur-Richelieju, J3B 3E6, Quebec
Email Martin Laforest
Weed scientist
Agriculture and Agri-Food Canada
Saint-Jean-sur-Richelieu research centre
430 Gouin
Saint-Jean-sur-Richelieu, J3B 3E6, Quebec
Email Marie-Josée Simard
Web   : Web Site Link


The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Quebec have been instrumental in providing you this information. Particular thanks is given to Martin Laforest, and Marie-Josée Simard for providing detailed information.
Herbicide Resistant Birdsrape Mustard Globally
(Brassica rapa (=B. campestris))
Herbicide Resistant Birdsrape Mustard Globally
(Brassica rapa (=B. campestris))
Drag a column header and drop it here to group by that column
Herbicide Resistant Birdsrape Mustard Globally
(Brassica rapa (=B. campestris))
#CountryFirstYearSituationActive IngredientsSite of Action
1 ArgentinaArgentina 2012 Soybean, and Wheat diclosulam, glyphosate, imazapyr, and metsulfuron-methyl 48 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
36Brassica rapa (=B. campestris)Birdsrape Mustard17120
2 ArgentinaArgentina 2015 Soybean, Wheat, and Winter barley 2,4-D 48 Synthetic Auxins (O/4)
36Brassica rapa (=B. campestris)Birdsrape Mustard18175
3 Canada (Quebec) CanadaQuebec1977 Corn (maize) atrazine 7 Photosystem II inhibitors (C1/5)
36Brassica rapa (=B. campestris)Birdsrape Mustard433
4 Canada (Quebec) CanadaQuebec2017 Corn (maize), and Soybean glyphosate 7 EPSP synthase inhibitors (G/9)
36Brassica rapa (=B. campestris)Birdsrape Mustard17130
Literature about Similar Cases

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