International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
HRAC GROUP 5 (LEGACY C1 C2) RESISTANT SHEPHERD'S-PURSE
(Capsella bursa-pastoris)

PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)

United States, Oregon
INTRODUCTION SHEPHERD'S-PURSE
Shepherd's-purse (Capsella bursa-pastoris) is a dicot weed in the Brassicaceae family.  In Oregon this weed first evolved resistance to Group 5 (Legacy C1 C2) herbicides in 2007 and infests Alfalfa.   Group 5 (Legacy C1 C2) herbicides are known as PSII inhibitors - Serine 264 Binders (Inhbition of Photosynthesis at PSll - Serine 264 Binders ).  Research has shown that these particular biotypes are resistant to hexazinone, and metribuzin and they may be cross-resistant to other Group 5 (Legacy C1 C2) 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 Feb 06, 2009 )

Common NameShepherd's-purse
SpeciesCapsella bursa-pastoris
GroupPSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
Herbicideshexazinone, and metribuzin
LocationUnited States, Oregon
Year2007
Situation(s)Alfalfa
Contributors - (Alphabetically)Carol Mallory-Smith, and Alejandro Perez-Jones 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse 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 HRAC Group 5 resistant Shepherd's-purse indicate that the inheritance is determined by a one gene, cytoplasmic 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 5 (Legacy C1 C2) resistant Shepherd's-purse from Oregon 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 5 (Legacy C1 C2) resistant Shepherd's-purse from Oregon please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

CAROL MALLORY-SMITH
Professor
Oregon State University
Department of Crop And Soil Science
331B Crop Science Bldg
Corvallis, 97331, Oregon
United States
Email Carol Mallory-Smith
Web   : Web Site Link
ALEJANDRO PEREZ-JONES
Weed Research Specialist
Monsanto
Chemistry Technology
402 West State Farm Road
St. Louis, 63167, Missouri
United States
Email Alejandro Perez-Jones
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Oregon have been instrumental in providing you this information. Particular thanks is given to Carol Mallory-Smith, and Alejandro Perez-Jones 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 ( HRAC Group 2 (Legacy B)
 		41Capsella bursa-pastorisShepherd's-purse5381
2 Canada (Alberta) CanadaAlberta2011 Wheat thifensulfuron-methyl, and tribenuron-methyl 7 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
 		41Capsella bursa-pastorisShepherd's-purse5623
3 ChinaChina 2009 Winter wheat tribenuron-methyl 9 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
 		41Capsella bursa-pastorisShepherd's-purse5502
4 DenmarkDenmark 2012 Spring Barley florasulam, and tribenuron-methyl 13 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
 		41Capsella bursa-pastorisShepherd's-purse8910
5 IsraelIsrael 2000 Roadsides imazapyr 23 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
 		41Capsella bursa-pastorisShepherd's-purse5465
6 NorwayNorway 2019 Wheat iodosulfuron-methyl-Na 31 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
 		41Capsella bursa-pastorisShepherd's-purse18169
7 PolandPoland 1984 Orchards simazine 33 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
 		41Capsella bursa-pastorisShepherd's-purse166
8 United States (Oregon) United StatesOregon2007 Alfalfa hexazinone, and metribuzin 45 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
 		41Capsella bursa-pastorisShepherd's-purse5366
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