<b>HRAC Group 2</b> <font size='2'> (Legacy B) </font> resistant Tripleurospermum perforatum (=T. inodorum) from Sweden

INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

HRAC GROUP 2 (LEGACY B) RESISTANT SCENTLESS CHAMOMILE
(Tripleurospermum perforatum (=T. inodorum))

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Sweden

INTRODUCTION		SCENTLESS CHAMOMILE
Scentless Chamomile (Tripleurospermum perforatum (=T. inodorum)) is a dicot weed in the Asteraceae family. In Sweden this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2015 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	Scentless Chamomile
Species	Tripleurospermum perforatum (=T. inodorum)
Group	Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicides	florasulam, and tribenuron-methyl
Location	Sweden
Year	2015
Situation(s)	Wheat
Contributors - (Alphabetically)	Henrik Hallquist, and Solvejg Mathiassen
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Scentless Chamomile biotype with this Scentless 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 Scentless 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 Scentless 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 Scentless Chamomile Globally
(Tripleurospermum perforatum (=T. inodorum))

Country

FirstYear

Situation

Active Ingredients

Site of Action

Czech Republic

2021

Wheat

florasulam, and tribenuron-methyl