International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP B/2 RESISTANT WILD CHAMOMILE
(Matricaria recutita (= M. chamomilla))


ALS inhibitors (B/2)

Belgium, West Flanders
INTRODUCTION WILD CHAMOMILE
Wild Chamomile (Matricaria recutita (= M. chamomilla)) is a dicot weed in the Asteraceae family.  In Belgium this weed first evolved resistance to Group B/2 herbicides in 2012 and infests Wheat.   Group B/2 herbicides are known as ALS inhibitors (Inhibition of acetolactate synthase ALS (acetohydroxyacid synthase AHAS)).  Research has shown that these particular biotypes are resistant to metsulfuron-methyl and they may be cross-resistant to other Group B/2 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 Jan 28, 2015 )

Common NameWild Chamomile
SpeciesMatricaria recutita (= M. chamomilla)
GroupALS inhibitors (B/2)
Herbicidesmetsulfuron-methyl
LocationBelgium, West Flanders
Year2012
Situation(s)Wheat
Contributors - (Alphabetically)Benny De Cauwer 
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NOTES ABOUT THIS BIOTYPE

GENERAL

Benny De Cauwer
Province of West Flanders, coastal polder area. This biotype is present in only a few winter wheat fields (with narrow crop rotation).

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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 Group B/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

Studies on the mechanism of resistance of Group B/2 resistant Wild Chamomile from Belgium indicate that resistance is due to an altered target site.  There may be a note below or an article discussing the mechanism of resistance in the Fact Sheets and Other Literature
 
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 B/2 resistant Wild Chamomile from Belgium please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

BENNY DE CAUWER
Doctor assistant, Research associate
University of Ghent, faculty of Bioscience-engineering
Dept. Plant Production
Weed Science Unit
Coupure Links 653
9000 Gent, 9000
Belgium
Email Benny De Cauwer

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Belgium have been instrumental in providing you this information. Particular thanks is given to Benny De Cauwer 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 ALS inhibitors (B/2)
248Matricaria recutita (= M. chamomilla)Wild Chamomile7889
2 GermanyGermany 2008 Wheat tribenuron-methyl 18 ALS inhibitors (B/2)
248Matricaria recutita (= M. chamomilla)Wild Chamomile5469
3 NorwayNorway 2012 Wheat, and Winter barley metsulfuron-methyl, and tribenuron-methyl 31 ALS inhibitors (B/2)
248Matricaria recutita (= M. chamomilla)Wild Chamomile18155
4 PolandPoland 2014 Winter wheat tribenuron-methyl 33 ALS inhibitors (B/2)
248Matricaria recutita (= M. chamomilla)Wild Chamomile10984
5 SwedenSweden 2014 Wheat florasulam, and tribenuron-methyl 40 ALS inhibitors (B/2)
248Matricaria recutita (= M. chamomilla)Wild Chamomile15075
Literature about Similar Cases

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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Wednesday, September 18, 2019 .  Available  www.weedscience.org
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