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)

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 2 (Legacy B) herbicides in 2012 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 metsulfuron-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 Jan 28, 2015 )

Common NameWild Chamomile
SpeciesMatricaria recutita (= M. chamomilla)
GroupInhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicidesmetsulfuron-methyl
LocationBelgium, West Flanders
Year2012
Situation(s)Wheat
Contributors - (Alphabetically)Benny De Cauwer 
Edit this Case  |  Add New Case of Resistance  |  Add Note

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).

Edit this Note  |  Add New Note
 

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

Studies on the mechanism of resistance of Group 2 (Legacy B) 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 2 (Legacy B) resistant Wild Chamomile from Belgium please update the database.
 
Edit Case  |  Add Note  |  Add Article  |  Add New Case  |  

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 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
Literature about Similar Cases

1
Page size:
select
Page: of 1
Items 1 to 4 of 4

1
Page size:
select
Page: of 1
Items 1 to 4 of 4
PERMISSION MUST BE OBTAINED FIRST if you intend to base a significant portion of a scientific paper on data derived from this site. Citation:
Heap, I.  The International Herbicide-Resistant Weed Database.  Online.  Saturday, November 23, 2024 .  Available  www.weedscience.org Copyright © 1993- 2024 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.