<b>HRAC Group 2</b> <font size='2'> (Legacy B) </font> resistant Matricaria recutita (= M. chamomilla) from Belgium

International Survey of Herbicide-Resistant Weeds

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Thursday, October 31, 2024

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.

QUIK STATS (last updated Jan 28, 2015 )
Common Name	Wild Chamomile
Species	Matricaria recutita (= M. chamomilla)
Group	Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicides	metsulfuron-methyl
Location	Belgium, West Flanders
Year	2012
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 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.

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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.

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Herbicide Resistant Wild Chamomile Globally
(Matricaria recutita (= M. chamomilla))

Country

FirstYear

Situation

Active Ingredients

Site of Action

Belgium

2012

Wheat

metsulfuron-methyl