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)

Norway
INTRODUCTION SCENTLESS CHAMOMILE
Scentless Chamomile (Tripleurospermum perforatum (=T. inodorum)) is a dicot weed in the Asteraceae family.  In Norway this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2006 and infests Winter 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 iodosulfuron-methyl-Na, 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 Mar 09, 2015 )

Common NameScentless Chamomile
SpeciesTripleurospermum perforatum (=T. inodorum)
GroupInhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicidesiodosulfuron-methyl-Na, and tribenuron-methyl
LocationNorway
Year2006
Situation(s)Winter wheat
Contributors - (Alphabetically)Jan Netland 
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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 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 Norway please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

JAN NETLAND
The Norwegian Crop Research Institute
Plant Protection Centre
Department Of Herbology
Exotic & Invasive Weed Research
One Shields Ave, Mail Stop 4
Fellesbygget, N-1432, ÅS
Norway
Email Jan Netland

ACKNOWLEDGEMENTS

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