INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

HRAC GROUP 4 (LEGACY O) RESISTANT CANADA THISTLE
(Cirsium arvense)


Auxin Mimics HRAC Group 4 (Legacy O)

Hungary
INTRODUCTION CANADA THISTLE
Canada thistle (Cirsium arvense) is a dicot weed in the Asteraceae family.  In Hungary this weed first evolved resistance to Group 4 (Legacy O) herbicides in 1985 and infests Pastures.   Group 4 (Legacy O) herbicides are known as Auxin Mimics (Auxin Mimics ).  Research has shown that these particular biotypes are resistant to 2,4-D, and MCPA and they may be cross-resistant to other Group 4 (Legacy O) 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 Sep 15, 2000 )

Common NameCanada thistle
SpeciesCirsium arvense
GroupAuxin Mimics HRAC Group 4 (Legacy O)
Herbicides2,4-D, and MCPA
LocationHungary
Year1985
Situation(s)Pastures
Contributors - (Alphabetically)Peter Solymosi 
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NOTES ABOUT THIS BIOTYPE

GENERAL

Peter Solymosi
Solymosi, P., Z.Kostyal, and A. Gimesi. 1987. Resistance of Cirsium arvense (L.) to Phenoxyacetic acid derivatives." Novenyvedelem 23: 301-305. Also in Hodgson, J. M. 1970. "The response of Canada thistle ecotypes to 2,4-D, Amitrole and Intensive cultivation", Weed Sci. 18:253-255.

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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Canada thistle biotype with this Canada thistle 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 4 resistant Canada thistle 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 4 (Legacy O) resistant Canada thistle from Hungary please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

PETER SOLYMOSI
Hungarian Academy Of Sciences
Dept of Horticulture
164 Plant Science Bldg,
Budapest, H-1525
Hungary

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Hungary have been instrumental in providing you this information. Particular thanks is given to Peter Solymosi for providing detailed information.
Herbicide Resistant Canada thistle Globally
(Cirsium arvense)
Herbicide Resistant Canada thistle Globally
(Cirsium arvense)
Drag a column header and drop it here to group by that column
Herbicide Resistant Canada thistle Globally
(Cirsium arvense)
#CountryFirstYearSituationActive IngredientsSite of Action
1 HungaryHungary 1985 Pastures 2,4-D, and MCPA 20 Auxin Mimics ( HRAC Group 4 (Legacy O)
55Cirsium arvenseCanada thistle306
2 SwedenSweden 1979 Cropland MCPA 40 Auxin Mimics ( HRAC Group 4 (Legacy O)
55Cirsium arvenseCanada thistle395
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