INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

HRAC GROUP 2 (LEGACY B) RESISTANT BUR CHERVIL
(Anthriscus caucalis)


Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Germany
INTRODUCTION BUR CHERVIL
Bur Chervil (Anthriscus caucalis) is a dicot weed in the Apiaceae family.  In Germany this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2017 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 florasulam, metsulfuron-methyl, thifensulfuron-methyl, 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 Jun 12, 2022 )

Common NameBur Chervil
SpeciesAnthriscus caucalis
GroupInhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicidesflorasulam, metsulfuron-methyl, thifensulfuron-methyl, and tribenuron-methyl
LocationGermany
Year2017
Situation(s)Winter wheat
Contributors - (Alphabetically)Rebecka Dücker, and Jean Wagner 
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NOTES ABOUT THIS BIOTYPE

GENERAL

Rebecka Dücker

30. Deutsche Arbeitsbesprechung über Fragen der Unkrautbiologie und -bekämpfung, 22. – 24. Februar 2022 online

Sektion 5: Resistenzanalyse Session 5:

Resistance analysis Resistance patterns of a bur chervil (Anthriscus caucalis M. Bieb.) population with a point mutation within the acetolactate synthase gene in comparison with sensitive bur chervil and further weedy Apiaceae species. 

 Rebecka Dücker1*, Manja Landschreiber2, Muhammad Khan1; Ernesto Adrian Veron Zarate1, Cornelius Ebert1, Johannes Herrmann2, Martin Heß2, Jean Wagner1 1Georg-August Universität Göttingen, Abteilung für Pflanzenpathologie und -schutz, Göttingen, Germany 2Landwirtschaftskammer Schleswig-Holstein, Lübeck, Germany 3Agris42 GmbH, Stuttgart, Germany *rduecke@gwdg.de

DOI: 10.5073/20220124-062051

 

Abstract

 Weeds of the umbelliferous family (Apiaceae) are gaining importance in several crops and regions and are often difficult to control chemically. For example, the occurrence of bur chervil (Anthriscus caucalis M. Bieb.) is not only increasing as a ruderal plant, but is also establishing as an arable weed in winter crops. There, it is often not sufficiently controlled by standard measures and beyond that frequently confused with other weedy umbellifers. In addition, the first A. caucalis populations with resistance to inhibitors of the acetolactate synthase (ALS) have been described. For this reason, we sequenced the ALS gene of a sensitive and a resistant A. caucalis population and found a mutation at position Pro197. This population was compared with a sensitive one, as well as other umbellifers such as hedge parsley (Torilis arvensis (Huds.) Link), wild carrot (Daucus carota L.) and hemlock (Conium maculatum L.) in a greenhouse trial with 14 herbicides. There were clear differences between the treatments of sensitive and resistant A. caucalis and the other umbellifers. The sensitive A. caucalis population was effectively controlled by the ALS inhibitors thifensulfuron, tribenuron and metsulfuron, but not by florasulam. Of these herbicides, only metsulfuron had a partial efficacy on the resistant population with 71.8% freshwater reduction. Notably, the efficacy profiles of ALS inhibitors differed significantly between species, while several synthetic auxins and chlortoluron effectively controlled most populations tested. Finally, the correct identification of the umbellifer species, as well as the resistance status, is necessary to carry out targeted chemical control. 

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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse, and Laboratory trials comparing a known susceptible Bur Chervil biotype with this Bur Chervil 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 Bur Chervil 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 Bur Chervil 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 Bur Chervil from Germany please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

REBECKA DÜCKER
Scientist
Georg-August-Universität Göttingen
Department of Crop Science
Plant Pathology and Crop Protection
Grisebachstr. 6
Göttingen, 37077, Lower Saxony
Germany
Email Rebecka Dücker
Web   : Web Site Link
JEAN WAGNER
Weed Scientist
Plant Pathology and Crop Protection
Department of Crop Sciences
Grisebachstrasse 6
Göttingen, 37077, Lower Saxony
Germany
Email Jean Wagner
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 Rebecka Dücker, and Jean Wagner for providing detailed information.
Herbicide Resistant Bur Chervil Globally
(Anthriscus caucalis)
Herbicide Resistant Bur Chervil Globally
(Anthriscus caucalis)
Drag a column header and drop it here to group by that column
Herbicide Resistant Bur Chervil Globally
(Anthriscus caucalis)
#CountryFirstYearSituationActive IngredientsSite of Action
1 GermanyGermany 2017 Winter wheat florasulam, metsulfuron-methyl, thifensulfuron-methyl, and tribenuron-methyl 18 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
356Anthriscus caucalisBur Chervil23240
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