INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

HRAC GROUP 2 (LEGACY B) RESISTANT MOUSE-EAR CRESS
(Arabidopsis thaliana)


Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

United States, Virginia
INTRODUCTION MOUSE-EAR CRESS
Mouse-ear Cress (Arabidopsis thaliana) is a dicot weed in the Brassicaceae family.  In Virginia this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2015 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 flucarbazone-Na, mesosulfuron-methyl, pyroxsulam, 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 Sep 09, 2021 )

Common NameMouse-ear Cress
SpeciesArabidopsis thaliana
GroupInhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicidesflucarbazone-Na, mesosulfuron-methyl, pyroxsulam, thifensulfuron-methyl, and tribenuron-methyl
LocationUnited States, Virginia
Year2015
Situation(s)Wheat
Contributors - (Alphabetically)Scott Hagood 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse, and Laboratory trials comparing a known susceptible Mouse-ear Cress biotype with this Mouse-ear Cress 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 Mouse-ear Cress 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 Mouse-ear Cress from Virginia 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 Mouse-ear Cress from Virginia please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

SCOTT HAGOOD
Virginia Tech
PO Box 1203
Blacksburg, 24061, Virginia
United States
Email Scott Hagood

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Virginia have been instrumental in providing you this information. Particular thanks is given to Scott Hagood for providing detailed information.
Herbicide Resistant Mouse-ear Cress Globally
(Arabidopsis thaliana)
Herbicide Resistant Mouse-ear Cress Globally
(Arabidopsis thaliana)
Drag a column header and drop it here to group by that column
Herbicide Resistant Mouse-ear Cress Globally
(Arabidopsis thaliana)
#CountryFirstYearSituationActive IngredientsSite of Action
1 United KingdomUnited Kingdom 1988 Railways atrazine 44 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
292Arabidopsis thalianaMouse-ear Cress7762
2 United States (Virginia) United StatesVirginia2015 Wheat flucarbazone-Na, mesosulfuron-methyl, pyroxsulam, thifensulfuron-methyl, and tribenuron-methyl 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
292Arabidopsis thalianaMouse-ear Cress21232
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PERMISSION MUST BE OBTAINED FIRST if you intend to base a significant portion of a scientific paper on data derived from this site. Citation:
Heap, I.  The International Herbicide-Resistant Weed Database.  Online.  Sunday, December 5, 2021 .  Available  www.weedscience.org Copyright © 1993- 2021 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.