International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP O/4 RESISTANT BIRDSRAPE MUSTARD
(Brassica rapa (=B. campestris))


Synthetic Auxins (O/4)

Argentina, Azul District, Buenos Aires province
INTRODUCTION BIRDSRAPE MUSTARD
Birdsrape Mustard (Brassica rapa (=B. campestris)) is a dicot weed in the Brassicaceae family.  In Argentina this weed first evolved resistance to Group O/4 herbicides in 2015 and infests Soybean, Wheat, and Winter barley.   Group O/4 herbicides are known as Synthetic Auxins (Synthetic auxins (action like indoleacetic acid)).  Research has shown that these particular biotypes are resistant to 2,4-D and they may be cross-resistant to other Group O/4 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 Nov 14, 2019 )

Common NameBirdsrape Mustard
SpeciesBrassica rapa (=B. campestris)
GroupSynthetic Auxins (O/4)
Herbicides2,4-D
LocationArgentina, Azul District, Buenos Aires province
Year2015
Situation(s)Soybean, Wheat, and Winter barley
Contributors - (Alphabetically)Ricardo Fernández, Victor Juan, Federico Roberto Nuñez Fre, and Horacio Saint-André 
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ACADEMIC ASPECTS

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.
 
Genetics

Genetic studies on Group O/4 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 O/4 resistant Birdsrape Mustard from Argentina please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

RICARDO FERNÁNDEZ
Agricultural engineer
Facultad de Agronomía - UNCPBA
Cátedra de Terapéutica Vegetal
Av. República de Italia Nº780
Azul, 7300, Buenos Aires
Argentina
Email Ricardo Fernández
VICTOR JUAN
Ing. Agr. M. Sci.
Facultad de Agronomia
Universidad Nacional del Centro de la Pcia de Bs As
Rca de Italia 780
Azul, 7300, Buenos Aires
Argentina
Email Victor Juan
FEDERICO ROBERTO NUÑEZ FRE
Researcher
Cátedra de Terapéutica Vegetal
Facultad de Agronomía de Azul
Av. Republica de Italia Nº780
Azul, 7300, Buenos Aires
Argentina
Email Federico Roberto Nuñez Fre
Web   : Web Site Link
HORACIO SAINT-ANDRÉ
Agricultural engineer
Facultad de Agronomía - UNCPBA
Terapéutica vegetal
Av. República de Italia Nº780
Azul, 7300, Buenos Aires
Argentina
Email Horacio Saint-André
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Argentina have been instrumental in providing you this information. Particular thanks is given to Ricardo Fernández, Victor Juan, Federico Roberto Nuñez Fre, and Horacio Saint-André 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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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Thursday, November 21, 2019 .  Available  www.weedscience.org
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