International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
HRAC GROUP 2 (LEGACY B) RESISTANT CHEAT (RYE BROME)
(Bromus secalinus)

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

United States, Kansas
INTRODUCTION CHEAT (RYE BROME)
Cheat (Rye Brome) (Bromus secalinus) is a monocot weed in the Poaceae family.  In Kansas this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2007 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 imazamox, propoxycarbazone-Na, pyroxsulam, and sulfosulfuron 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 Jan 25, 2011 )

Common NameCheat (Rye Brome)
SpeciesBromus secalinus
GroupInhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicidesimazamox, propoxycarbazone-Na, pyroxsulam, and sulfosulfuron
LocationUnited States, Kansas
Year2007
Situation(s)Winter wheat
Contributors - (Alphabetically)Dallas Peterson 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse, and Laboratory trials comparing a known susceptible Cheat (Rye Brome) biotype with this Cheat (Rye Brome) 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 Cheat (Rye Brome) 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 Cheat (Rye Brome) from Kansas 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 Cheat (Rye Brome) from Kansas please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

DALLAS PETERSON
Professor and Extension Weed Specialist
Kansas State University
Department of Agronomy
3703 Throckmorton Plant Sciences Center
1712 Claflin Road
Manhattan, KS 66506-0110, Kansas
United States
Email Dallas Peterson
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Kansas have been instrumental in providing you this information. Particular thanks is given to Dallas Peterson for providing detailed information.
Herbicide Resistant Cheat (Rye Brome) Globally
(Bromus secalinus)
Herbicide Resistant Cheat (Rye Brome) Globally
(Bromus secalinus)
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Herbicide Resistant Cheat (Rye Brome) Globally
(Bromus secalinus)
#CountryFirstYearSituationActive IngredientsSite of Action
1 United States (Kansas) United StatesKansas2007 Winter wheat imazamox, propoxycarbazone-Na, pyroxsulam, and sulfosulfuron 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
 		245Bromus secalinusCheat (Rye Brome)5446
2 United States (Oklahoma) United StatesOklahoma2009 Wheat imazamox, propoxycarbazone-Na, pyroxsulam, and sulfosulfuron 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
 		245Bromus secalinusCheat (Rye Brome)5527
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