International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP B/2 RESISTANT SCENTLESS CHAMOMILE
(Tripleurospermum perforatum (=T. inodorum))


ALS inhibitors (B/2)

Denmark
INTRODUCTION SCENTLESS CHAMOMILE
Scentless Chamomile (Tripleurospermum perforatum (=T. inodorum)) is a dicot weed in the Asteraceae family.  In Denmark this weed first evolved resistance to Group B/2 herbicides in 2010 and infests Spring Barley, and Winter wheat.   Group B/2 herbicides are known as ALS inhibitors (Inhibition of acetolactate synthase ALS (acetohydroxyacid synthase AHAS)).  Research has shown that these particular biotypes are resistant to florasulam, iodosulfuron-methyl-sodium, and tribenuron-methyl and they may be cross-resistant to other Group B/2 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.

If we do not have a picture for this weed, or you can provide a better picture (scan, digital camera etc) please please e-mail it to us.

QUIK STATS (last updated May 07, 2017 )

Common NameScentless Chamomile
SpeciesTripleurospermum perforatum (=T. inodorum)
GroupALS inhibitors (B/2)
Herbicidesflorasulam, iodosulfuron-methyl-sodium, and tribenuron-methyl
LocationDenmark
Year2010
Situation(s)Spring Barley, and Winter wheat
Contributors - (Alphabetically)Solvejg Mathiassen 
Edit this Case  |  Add New Case of Resistance  |  Add Note

NOTES ABOUT THIS BIOTYPE

GENERAL

Solvejg Mathiassen

April 2017 Update

Tripleurospermum perforatum

20 verified cases. Most of these cases are seed samples sent by farmers or consultants on suspicion of resistance. They have been tested in pot experiments including a susceptible and resistant reference population. Tribenuron-methyl and florasulam have been applied in 4-6 doses. A survey on untreated plots in agricultural fields all over Denmark showed that T. inodorum was resistant in 1% of the fields. 

Edit this Note  |  Add New Note
 

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 Group B/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 B/2 resistant Scentless Chamomile from Denmark 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 B/2 resistant Scentless Chamomile from Denmark please update the database.
 
Edit Case  |  Add Note  |  Add Article  |  Add New Case  |  Help

CONTRIBUTING WEED SCIENTISTS

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 Denmark have been instrumental in providing you this information. Particular thanks is given to Solvejg Mathiassen 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 DenmarkDenmark 2010 Spring Barley, and Winter wheat florasulam, iodosulfuron-methyl-sodium, and tribenuron-methyl 13 ALS inhibitors (B/2)
116Tripleurospermum perforatum (=T. inodorum)Scentless Chamomile5673
2 FranceFrance 2010 Wheat metsulfuron-methyl 17 ALS inhibitors (B/2)
116Tripleurospermum perforatum (=T. inodorum)Scentless Chamomile9939
3 GermanyGermany 2009 Wheat tribenuron-methyl 18 ALS inhibitors (B/2)
116Tripleurospermum perforatum (=T. inodorum)Scentless Chamomile5534
4 NorwayNorway 2006 Winter wheat iodosulfuron-methyl-sodium, and tribenuron-methyl 31 ALS inhibitors (B/2)
116Tripleurospermum perforatum (=T. inodorum)Scentless Chamomile10975
5 PolandPoland 2014 Winter wheat tribenuron-methyl 33 ALS inhibitors (B/2)
116Tripleurospermum perforatum (=T. inodorum)Scentless Chamomile10971
6 SwedenSweden 2015 Wheat florasulam, and tribenuron-methyl 40 ALS inhibitors (B/2)
116Tripleurospermum perforatum (=T. inodorum)Scentless Chamomile15076
7 United KingdomUnited Kingdom 2002 Cereals metsulfuron-methyl 44 ALS inhibitors (B/2)
116Tripleurospermum perforatum (=T. inodorum)Scentless Chamomile7763
Literature about Similar Cases

1
Page size:
select
Page: of 1
Items 1 to 2 of 2

1
Page size:
select
Page: of 1
Items 1 to 2 of 2
PERMISSION MUST BE OBTAINED FIRST if you intend to base a significant portion of a scientific paper on data derived from this site.
Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Saturday, August 19, 2017 .  Available  www.weedscience.org
Copyright © 1993- 2017 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.