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)

Czech Republic
INTRODUCTION SCENTLESS CHAMOMILE
Scentless Chamomile (Tripleurospermum perforatum (=T. inodorum)) is a dicot weed in the Asteraceae family.  In Czech Republic this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2021 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.

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QUIK STATS (last updated Nov 23, 2021 )

Common NameScentless Chamomile
SpeciesTripleurospermum perforatum (=T. inodorum)
GroupInhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicidesflorasulam, and tribenuron-methyl
LocationCzech Republic
Year2021
Situation(s)Wheat
Contributors - (Alphabetically)Katerina Hamouzova 
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ACADEMIC ASPECTS

Confirmation Tests

Field, Greenhouse, and Laboratory 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

Studies on the mechanism of resistance of Group 2 (Legacy B) resistant Scentless Chamomile from Czech Republic 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 Scentless Chamomile from Czech Republic please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

KATERINA HAMOUZOVA
Weed Research Scientist
Czech University Of Agriculture In Prague
Depart. Of Agroecology And Biometeorology
Kamycka 129
Prague, 6 - Suchdol, 16521, Prague
Czech Republic
Email Katerina Hamouzova
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Czech Republic have been instrumental in providing you this information. Particular thanks is given to Katerina Hamouzova for providing detailed information.
Herbicide Resistant Scentless Chamomile Globally
(Tripleurospermum perforatum (=T. inodorum))
Herbicide Resistant Scentless Chamomile Globally
(Tripleurospermum perforatum (=T. inodorum))
Drag a column header and drop it here to group by that column
Herbicide Resistant Scentless Chamomile Globally
(Tripleurospermum perforatum (=T. inodorum))
#CountryFirstYearSituationActive IngredientsSite of Action
1 Czech RepublicCzech Republic 2021 Wheat florasulam, and tribenuron-methyl 12 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
116Tripleurospermum perforatum (=T. inodorum)Scentless Chamomile21235
2 DenmarkDenmark 2010 Spring Barley, and Winter wheat florasulam, iodosulfuron-methyl-Na, and tribenuron-methyl 13 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
116Tripleurospermum perforatum (=T. inodorum)Scentless Chamomile5673
3 FranceFrance 2010 Wheat metsulfuron-methyl 17 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
116Tripleurospermum perforatum (=T. inodorum)Scentless Chamomile9939
4 GermanyGermany 2009 Wheat tribenuron-methyl 18 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
116Tripleurospermum perforatum (=T. inodorum)Scentless Chamomile5534
5 NorwayNorway 2006 Winter wheat iodosulfuron-methyl-Na, and tribenuron-methyl 31 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
116Tripleurospermum perforatum (=T. inodorum)Scentless Chamomile10975
6 PolandPoland 2014 Winter wheat tribenuron-methyl 33 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
116Tripleurospermum perforatum (=T. inodorum)Scentless Chamomile10971
7 SwedenSweden 2015 Wheat florasulam, and tribenuron-methyl 40 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
116Tripleurospermum perforatum (=T. inodorum)Scentless Chamomile15076
8 United KingdomUnited Kingdom 2002 Cereals metsulfuron-methyl 44 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
116Tripleurospermum perforatum (=T. inodorum)Scentless Chamomile7763
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Heap, I.  The International Herbicide-Resistant Weed Database.  Online.  Thursday, December 12, 2024 .  Available  www.weedscience.org Copyright © 1993- 2024 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.