International Survey of Herbicide-Resistant Weeds

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


Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Australia, Western Australia
INTRODUCTION BLACKGRASS
Blackgrass (Alopecurus myosuroides) is a monocot weed in the Poaceae family.  In Belgium this weed first evolved multiple resistance (to 4 herbicide sites of action) in 1996 and infests Wheat.  Multiple resistance has evolved to herbicides in the Groups 1 (Legacy A), Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B), PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2), and Inhibition of Microtubule Assembly 2 HRAC Group 3 (Legacy K1).  These particular biotypes are known to have resistance to mesosulfuron-methyl, and pyroxsulam and they may be cross-resistant to other herbicides in the Groups 1 (Legacy A), Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B), PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2), and Inhibition of Microtubule Assembly 2 HRAC Group 3 (Legacy K1).

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 21, 2000 )

Common NameBlackgrass
SpeciesAlopecurus myosuroides
GroupInhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

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

Inhibition of Microtubule Assembly 2 HRAC Group 3 (Legacy K1)
Herbicidesmesosulfuron-methyl, and pyroxsulam
LocationBelgium
Year1996
Situation(s)Wheat
Contributors - (Alphabetically)Peter Boutsalis 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Blackgrass biotype with this Blackgrass 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, 2, 5, 3 resistant Blackgrass 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 multiple resistant Blackgrass from Belgium 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 Belgium 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-ethyl 1 Inhibition of Acetyl CoA Carboxylase (A/1)
38Bromus diandrus ssp. rigidus (=B. rigidus)Rigid Brome5253
2 Australia (South Australia) AustraliaSouth Australia2007 Beans clethodim, fluazifop-butyl, haloxyfop-methyl, quizalofop-ethyl, and tepraloxydim 1 Inhibition of Acetyl CoA Carboxylase (A/1)
38Bromus diandrus ssp. rigidus (=B. rigidus)Rigid Brome5298
3 Australia (Western Australia) AustraliaWestern Australia2011 Wheat mesosulfuron-methyl, and pyroxsulam 1 Inhibition of Acetolactate Synthase (B/2)
38Bromus diandrus ssp. rigidus (=B. rigidus)Rigid Brome5578
4 Australia (South Australia) AustraliaSouth Australia2011 Wheat mesosulfuron-methyl, and pyroxsulam 1 Inhibition of Acetolactate Synthase (B/2)
38Bromus diandrus ssp. rigidus (=B. rigidus)Rigid Brome5579
Literature about Similar Cases

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