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

International Survey of Herbicide-Resistant Weeds

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Tuesday, April 16, 2024

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.

QUIK STATS (last updated Apr 11, 2017 )
Common Name	Wild Chamomile
Species	Matricaria recutita (= M. chamomilla)
Group	Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicides	florasulam, and tribenuron-methyl
Location	Sweden
Year	2014
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.

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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