International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
(Matricaria recutita (= M. chamomilla))

ALS inhibitors (B/2)

Wild Chamomile (Matricaria recutita (= M. chamomilla)) is a dicot weed in the Asteraceae family.  In Poland this weed first evolved resistance to Group B/2 herbicides in 2014 and infests Winter 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 tribenuron-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.

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 01, 2015 )

Common NameWild Chamomile
SpeciesMatricaria recutita (= M. chamomilla)
GroupALS inhibitors (B/2)
Situation(s)Winter wheat
Contributors - (Alphabetically)Kazimierz Adamczewski, and Kinga Matysiak 
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Confirmation Tests

Greenhouse, and Laboratory 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.

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

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 B/2 resistant Wild Chamomile from Poland please update the database.
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Institute Of Plant Protection - National Research Institute
Depart. Of Weed Science
Str. Wladyslawa Wegorka 20
Poznań, 60-318, Poznań
Email Kazimierz Adamczewski
Research Scientist
National Research Institute
Institute of Plant Protection - Weed Science Department
Wladyslawa Wegorka 20
Poznan, 60-318, Poznań
Email Kinga Matysiak


The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Poland have been instrumental in providing you this information. Particular thanks is given to Kazimierz Adamczewski, and Kinga Matysiak 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 PolandPoland 2014 Winter wheat tribenuron-methyl 33 ALS inhibitors (B/2)
248Matricaria recutita (= M. chamomilla)Wild Chamomile10984
Literature about Similar Cases

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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Friday, March 24, 2017 .  Available
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