INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

HRAC GROUP 2 (LEGACY B) RESISTANT WILD CHAMOMILE
(Matricaria recutita (= M. chamomilla))

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Sweden
INTRODUCTION WILD CHAMOMILE
Wild Chamomile (Matricaria recutita (= M. chamomilla)) is a dicot weed in the Asteraceae family.  In Sweden this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2014 and infests Wheat.   Group 2 (Legacy B) herbicides are known as Inhibition of Acetolactate Synthase (Inhibition of Acetolactate Synthase ).  Research has shown that these particular biotypes are resistant to florasulam, and tribenuron-methyl and they may be cross-resistant to other Group 2 (Legacy B) 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 Apr 11, 2017 )

Common NameWild Chamomile
SpeciesMatricaria recutita (= M. chamomilla)
GroupInhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicidesflorasulam, and tribenuron-methyl
LocationSweden
Year2014
Situation(s)Wheat
Contributors - (Alphabetically)Henrik Hallquist, and Solvejg Mathiassen 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Wild Chamomile biotype with this Wild Chamomile 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 2 resistant Wild Chamomile 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 2 (Legacy B) resistant Wild Chamomile from Sweden please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

HENRIK HALLQUIST
Weed Advisor
Swedish Board of Agriculture
Box 12
Alnarp, 23053, Skåne County
Sweden
Email Henrik Hallquist
SOLVEJG MATHIASSEN
Senior Scientist
Aarhus University, Science and Technology
Dept. of Agroecology
P.o. Box 30
Slagelse, 4200, Slagelse Municipality
Denmark
Email Solvejg Mathiassen

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Sweden have been instrumental in providing you this information. Particular thanks is given to Henrik Hallquist, and Solvejg Mathiassen for providing detailed information.
Herbicide Resistant Wild Chamomile Globally
(Matricaria recutita (= M. chamomilla))
Herbicide Resistant Wild Chamomile Globally
(Matricaria recutita (= M. chamomilla))
Drag a column header and drop it here to group by that column
Herbicide Resistant Wild Chamomile Globally
(Matricaria recutita (= M. chamomilla))
#CountryFirstYearSituationActive IngredientsSite of Action
1 BelgiumBelgium 2012 Wheat metsulfuron-methyl 3 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
 		248Matricaria recutita (= M. chamomilla)Wild Chamomile7889
2 GermanyGermany 2008 Wheat tribenuron-methyl 18 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
 		248Matricaria recutita (= M. chamomilla)Wild Chamomile5469
3 NorwayNorway 2012 Wheat, and Winter barley metsulfuron-methyl, and tribenuron-methyl 31 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
 		248Matricaria recutita (= M. chamomilla)Wild Chamomile18155
4 PolandPoland 2014 Winter wheat tribenuron-methyl 33 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
 		248Matricaria recutita (= M. chamomilla)Wild Chamomile10984
5 SwedenSweden 2014 Wheat florasulam, and tribenuron-methyl 40 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
 		248Matricaria recutita (= M. chamomilla)Wild Chamomile15075
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