International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP B/2 RESISTANT RIGID BROME
(Bromus diandrus ssp. rigidus (=B. rigidus))


ALS inhibitors (B/2)

Australia, South Australia
INTRODUCTION RIGID BROME
Rigid Brome (Bromus diandrus ssp. rigidus (=B. rigidus)) is a monocot weed in the Poaceae family.  In South Australia this weed first evolved resistance to Group B/2 herbicides in 2011 and infests 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 mesosulfuron-methyl, and pyroxsulam 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 Nov 30, 2011 )

Common NameRigid Brome
SpeciesBromus diandrus ssp. rigidus (=B. rigidus)
GroupALS inhibitors (B/2)
Herbicidesmesosulfuron-methyl, and pyroxsulam
LocationAustralia, South Australia
Year2011
Situation(s)Wheat
Contributors - (Alphabetically)Peter Boutsalis 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Rigid Brome biotype with this Rigid 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 Rigid 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

The mechanism of resistance for this biotype is either unknown or has not been entered in the database.  If you know anything about the mechanism of resistance for this biotype then please update the database.
 
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 Rigid Brome from South Australia please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

PETER BOUTSALIS
Postdoctural Fellow/ Consultant
University Of Adelaide / Plant Science Consulting
Plant And Pest Science
800 N Lindbergh Blvd
02G
Adelaide, 5064, South Australia
Australia
Email Peter Boutsalis

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in South Australia have been instrumental in providing you this information. Particular thanks is given to Peter Boutsalis for providing detailed information.
Herbicide Resistant Rigid Brome Globally
(Bromus diandrus ssp. rigidus (=B. rigidus))
Herbicide Resistant Rigid Brome Globally
(Bromus diandrus ssp. rigidus (=B. rigidus))
Drag a column header and drop it here to group by that column
Herbicide Resistant Rigid Brome Globally
(Bromus diandrus ssp. rigidus (=B. rigidus))
#CountryFirstYearSituationActive IngredientsSite of Action
1 Australia (Western Australia) AustraliaWestern Australia2005 Canola, and Lupins quizalofop-P-ethyl 1 ACCase inhibitors (A/1)
38Bromus diandrus ssp. rigidus (=B. rigidus)Rigid Brome5253
2 Australia (South Australia) AustraliaSouth Australia2007 Beans clethodim, fluazifop-P-butyl, haloxyfop-methyl, quizalofop-P-ethyl, and tepraloxydim 1 ACCase inhibitors (A/1)
38Bromus diandrus ssp. rigidus (=B. rigidus)Rigid Brome5298
3 Australia (Western Australia) AustraliaWestern Australia2011 Wheat mesosulfuron-methyl, and pyroxsulam 1 ALS inhibitors (B/2)
38Bromus diandrus ssp. rigidus (=B. rigidus)Rigid Brome5578
4 Australia (South Australia) AustraliaSouth Australia2011 Wheat mesosulfuron-methyl, and pyroxsulam 1 ALS inhibitors (B/2)
38Bromus diandrus ssp. rigidus (=B. rigidus)Rigid Brome5579
Literature about Similar Cases

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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Tuesday, October 15, 2019 .  Available  www.weedscience.org
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