International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP B/2 RESISTANT JAPANESE BROME
(Bromus japonicus)


ALS inhibitors (B/2)

United States, Kansas
INTRODUCTION JAPANESE BROME
Japanese Brome (Bromus japonicus) is a monocot weed in the Poaceae family.  In Kansas this weed first evolved resistance to Group B/2 herbicides in 2007 and infests Winter wheat.   Group B/2 herbicides are known as ALS inhibitors (Inhibition of acetolactate synthase ALS (acetohydroxyacid synthase AHAS)).  Research has shown that these particular biotypes are resistant to imazamox, propoxycarbazone-sodium, pyroxsulam, and sulfosulfuron 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 Jan 25, 2011 )

Common NameJapanese Brome
SpeciesBromus japonicus
GroupALS inhibitors (B/2)
Herbicidesimazamox, propoxycarbazone-sodium, 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 Japanese Brome biotype with this Japanese 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 Group B/2 resistant Japanese 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 B/2 resistant Japanese 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 B/2 resistant Japanese 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 Japanese Brome Globally
(Bromus japonicus)
Herbicide Resistant Japanese Brome Globally
(Bromus japonicus)
Drag a column header and drop it here to group by that column
Herbicide Resistant Japanese Brome Globally
(Bromus japonicus)
#CountryFirstYearSituationActive IngredientsSite of Action
1 United States (Kansas) United StatesKansas2007 Winter wheat imazamox, propoxycarbazone-sodium, pyroxsulam, and sulfosulfuron 45 ALS inhibitors (B/2)
246Bromus japonicusJapanese Brome5447
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Thursday, October 17, 2019 .  Available  www.weedscience.org
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