INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

HRAC GROUP 1 (LEGACY A) RESISTANT RIPGUT BROME
(Bromus diandrus)


Inhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)

Australia, Western Australia
INTRODUCTION RIPGUT BROME
Ripgut Brome (Bromus diandrus) is a monocot weed in the Poaceae family.  In Western Australia this weed first evolved resistance to Group 1 (Legacy A) herbicides in 2020 and infests Canola.   Group 1 (Legacy A) herbicides are known as Inhibition of Acetyl CoA Carboxylase (Inhibition of Acetyl CoA Carboxylase ).  Research has shown that these particular biotypes are resistant to clethodim, and quizalofop-ethyl and they may be cross-resistant to other Group 1 (Legacy A) 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 Aug 28, 2023 )

Common NameRipgut Brome
SpeciesBromus diandrus
GroupInhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)
Herbicidesclethodim, and quizalofop-ethyl
LocationAustralia, Western Australia
Year2020
Situation(s)Canola
Contributors - (Alphabetically)Roberto Busi, and Christopher Preston 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse, and Laboratory trials comparing a known susceptible Ripgut Brome biotype with this Ripgut 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 1 resistant Ripgut 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 1 (Legacy A) resistant Ripgut Brome from Western Australia 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 1 (Legacy A) resistant Ripgut Brome from Western Australia please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

ROBERTO BUSI
Research Asst Professor
University Of Western Australia
School Of Plant Biology - Uwa Institute Of Agriculture
Dept. 3354
1000 E. University Ave.,
Perth, 6009, Western Australia
Australia
Email Roberto Busi
Web   : Web Site Link
CHRISTOPHER PRESTON
Research Asst Professor
University Of Adelaide - Waite Campus
Crc For Australian Weed Management And School Of Agriculture
Box 2146
Adelaide, 5064, South Australia
Australia
Email Christopher Preston
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Western Australia have been instrumental in providing you this information. Particular thanks is given to Roberto Busi, and Christopher Preston for providing detailed information.
Herbicide Resistant Ripgut Brome Globally
(Bromus diandrus)
Herbicide Resistant Ripgut Brome Globally
(Bromus diandrus)
Drag a column header and drop it here to group by that column
Herbicide Resistant Ripgut Brome Globally
(Bromus diandrus)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Australia (Victoria) AustraliaVictoria1999 Cereals, and Winter pulses clethodim, fluazifop-butyl, haloxyfop-methyl, quizalofop-ethyl, and tepraloxydim 1 Inhibition of Acetyl CoA Carboxylase ( HRAC Group 1 (Legacy A)
197Bromus diandrusRipgut Brome5467
2 Australia (South Australia) AustraliaSouth Australia2011 Wheat mesosulfuron-methyl, and pyroxsulam 1 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
197Bromus diandrusRipgut Brome5580
3 Australia (South Australia) AustraliaSouth Australia2011 Fencelines, and Wheat glyphosate 1 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
197Bromus diandrusRipgut Brome5597
4 Australia (Western Australia) AustraliaWestern Australia2020 Canola clethodim, and quizalofop-ethyl 1 Inhibition of Acetyl CoA Carboxylase ( HRAC Group 1 (Legacy A)
197Bromus diandrusRipgut Brome26262
5 New ZealandNew Zealand 2024 Wheat pyroxsulam 30 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
197Bromus diandrusRipgut Brome27283
6 United KingdomUnited Kingdom 2020 Wheat iodosulfuron-methyl-Na, mesosulfuron-methyl, and pyroxsulam 44 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
197Bromus diandrusRipgut Brome25256
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