International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP B/2 RESISTANT SHEPHERD'S-PURSE
(Capsella bursa-pastoris)

Inhibition of Acetolactate Synthase (B/2)

Norway, Viken
INTRODUCTION SHEPHERD'S-PURSE
Shepherd's-purse (Capsella bursa-pastoris) is a dicot weed in the Brassicaceae family.  In Norway this weed first evolved resistance to Group B/2 herbicides in 2019 and infests Wheat.   Group B/2 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 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.

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QUIK STATS (last updated Oct 24, 2019 )

Common NameShepherd's-purse
SpeciesCapsella bursa-pastoris
GroupInhibition of Acetolactate Synthase (B/2)
Herbicidesiodosulfuron-methyl-Na
LocationNorway, Viken
Year2019
Situation(s)Wheat
Contributors - (Alphabetically)Björn Ringselle, and Magne Skårn 
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NOTES ABOUT THIS BIOTYPE

MECHANISM

Björn Ringselle
The sequencing clearly showed that Pro197 (CCT) had mutated to Thr197 (ACT) in both plants

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ACADEMIC ASPECTS

Confirmation Tests

Laboratory trials comparing a known susceptible Shepherd's-purse biotype with this Shepherd's-purse 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 Shepherd's-purse 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 Shepherd's-purse from Norway 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 Shepherd's-purse from Norway please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

BJÖRN RINGSELLE
Researcher/Forsker
Norwegian Institute of Bioeconony Research (NIBIO)
P.O. Box. 115
Høgskoleveien 7, 1434, Ås
Norway
Email Björn Ringselle
MAGNE SKÅRN
Engineer
Norwegian Institute of Bioeconony Research (NIBIO)
Biotechnology and Plant Health
Høgskolevegen 7
Ås, 1433, Akershus
Norway
Email Magne Skårn

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 Björn Ringselle, and Magne Skårn for providing detailed information.
Herbicide Resistant Shepherd's-purse Globally
(Capsella bursa-pastoris)
Herbicide Resistant Shepherd's-purse Globally
(Capsella bursa-pastoris)
Drag a column header and drop it here to group by that column
Herbicide Resistant Shepherd's-purse Globally
(Capsella bursa-pastoris)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Canada (Saskatchewan) CanadaSaskatchewan2008 Wheat imazamox, imazethapyr, thifensulfuron-methyl, and tribenuron-methyl 7 Inhibition of Acetolactate Synthase (B/2)
 		41Capsella bursa-pastorisShepherd's-purse5381
2 Canada (Alberta) CanadaAlberta2011 Wheat thifensulfuron-methyl, and tribenuron-methyl 7 Inhibition of Acetolactate Synthase (B/2)
 		41Capsella bursa-pastorisShepherd's-purse5623
3 ChinaChina 2009 Winter wheat tribenuron-methyl 9 Inhibition of Acetolactate Synthase (B/2)
 		41Capsella bursa-pastorisShepherd's-purse5502
4 DenmarkDenmark 2012 Spring Barley florasulam, and tribenuron-methyl 13 Inhibition of Acetolactate Synthase (B/2)
 		41Capsella bursa-pastorisShepherd's-purse8910
5 IsraelIsrael 2000 Roadsides imazapyr 23 Inhibition of Acetolactate Synthase (B/2)
 		41Capsella bursa-pastorisShepherd's-purse5465
6 NorwayNorway 2019 Wheat iodosulfuron-methyl-Na 31 Inhibition of Acetolactate Synthase (B/2)
 		41Capsella bursa-pastorisShepherd's-purse18169
7 PolandPoland 1984 Orchards simazine 33 PSII inhibitors - Serine 264 Binders (C1 C2/5)
 		41Capsella bursa-pastorisShepherd's-purse166
8 United States (Oregon) United StatesOregon2007 Alfalfa hexazinone, and metribuzin 45 PSII inhibitors - Serine 264 Binders (C1 C2/5)
 		41Capsella bursa-pastorisShepherd's-purse5366
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