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)

Germany
INTRODUCTION SCENTLESS CHAMOMILE
Scentless Chamomile (Tripleurospermum perforatum (=T. inodorum)) is a dicot weed in the Asteraceae family.  In Germany this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2009 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 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 Mar 17, 2011 )

Common NameScentless Chamomile
SpeciesTripleurospermum perforatum (=T. inodorum)
GroupInhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicidestribenuron-methyl
LocationGermany
Year2009
Situation(s)Wheat
Contributors - (Alphabetically)Jan Petersen 
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ACADEMIC ASPECTS

Confirmation Tests

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 indicate that the inheritance is determined by a one gene, dominant, nuclear trait.  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 Germany 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 Germany please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

JAN PETERSEN
Professor
University Of Applied Science Bingen
Fac. Of Life Science And Engineering
2836 Crestscene Trail
Bingen, D-55411
Germany
Email Jan Petersen
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Germany have been instrumental in providing you this information. Particular thanks is given to Jan Petersen 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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