INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

HRAC GROUP 2 (LEGACY B) RESISTANT WILD BUCKWHEAT
(Polygonum convolvulus (=Fallopia convolvulus))


Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Canada, Alberta
INTRODUCTION WILD BUCKWHEAT
Wild Buckwheat (Polygonum convolvulus (=Fallopia convolvulus)) is a dicot weed in the Polygonaceae family.  In Alberta this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2007 and infests Peas, and 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 florasulam, thifensulfuron-methyl, and tribenuron-methyl 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 19, 2014 )

Common NameWild Buckwheat
SpeciesPolygonum convolvulus (=Fallopia convolvulus)
GroupInhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicidesflorasulam, thifensulfuron-methyl, and tribenuron-methyl
LocationCanada, Alberta
Year2007
Situation(s)Peas, and Wheat
Contributors - (Alphabetically)Hugh Beckie 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Wild Buckwheat biotype with this Wild Buckwheat 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 Wild Buckwheat 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 2 (Legacy B) resistant Wild Buckwheat from Alberta please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

HUGH BECKIE
Professor of Crop Weed Science...Canadian Expat
University of Western Australia
Australian Herbicide Resistance Initiative
School of Agriculture and Environment
35 Stirling Highway
Crawley, 6009, Western Australia
Australia
Email Hugh Beckie

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Alberta have been instrumental in providing you this information. Particular thanks is given to Hugh Beckie for providing detailed information.
Herbicide Resistant Wild Buckwheat Globally
(Polygonum convolvulus (=Fallopia convolvulus))
Herbicide Resistant Wild Buckwheat Globally
(Polygonum convolvulus (=Fallopia convolvulus))
Drag a column header and drop it here to group by that column
Herbicide Resistant Wild Buckwheat Globally
(Polygonum convolvulus (=Fallopia convolvulus))
#CountryFirstYearSituationActive IngredientsSite of Action
1 Australia (Queensland) AustraliaQueensland1993 Wheat chlorsulfuron 1 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
88Polygonum convolvulus (=Fallopia convolvulus)Wild Buckwheat9
2 AustriaAustria 1980 Corn (maize) atrazine 2 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
88Polygonum convolvulus (=Fallopia convolvulus)Wild Buckwheat434
3 Canada (Alberta) CanadaAlberta2007 Peas, and Wheat florasulam, thifensulfuron-methyl, and tribenuron-methyl 7 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
88Polygonum convolvulus (=Fallopia convolvulus)Wild Buckwheat5379
4 GermanyGermany 1988 Corn (maize) atrazine 18 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
88Polygonum convolvulus (=Fallopia convolvulus)Wild Buckwheat446
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