<b>HRAC Group 2</b> <font size='2'> (Legacy B) </font> resistant Matricaria recutita (= M. chamomilla) from Germany

International Survey of Herbicide-Resistant Weeds

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Thursday, November 14, 2024

HRAC GROUP 2 (LEGACY B) RESISTANT WILD CHAMOMILE
(Matricaria recutita (= M. chamomilla))

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Germany

INTRODUCTION		WILD CHAMOMILE
Wild Chamomile (Matricaria recutita (= M. chamomilla)) is a dicot weed in the Asteraceae family. In Germany this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2008 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.

QUIK STATS (last updated Feb 03, 2010 )
Common Name	Wild Chamomile
Species	Matricaria recutita (= M. chamomilla)
Group	Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicides	tribenuron-methyl
Location	Germany
Year	2008
Situation(s)	Wheat
Contributors - (Alphabetically)	Jan Petersen
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ACADEMIC ASPECTS

Confirmation Tests

Field, and Greenhouse trials comparing a known susceptible Wild Chamomile biotype with this Wild 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 Wild 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 Wild 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 Wild 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.

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Herbicide Resistant Wild Chamomile Globally
(Matricaria recutita (= M. chamomilla))

Country

FirstYear

Situation

Active Ingredients

Site of Action

Belgium

2012

Wheat

metsulfuron-methyl