International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP B/2 RESISTANT WILD BUCKWHEAT
(Polygonum convolvulus (=Fallopia convolvulus))


ALS inhibitors (B/2)

Australia, Queensland
INTRODUCTION WILD BUCKWHEAT
Wild Buckwheat (Polygonum convolvulus (=Fallopia convolvulus)) is a dicot weed in the Polygonaceae family.  In Queensland this weed first evolved resistance to Group B/2 herbicides in 1993 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 chlorsulfuron 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 Jun 06, 2000 )

Common NameWild Buckwheat
SpeciesPolygonum convolvulus (=Fallopia convolvulus)
GroupALS inhibitors (B/2)
Herbicideschlorsulfuron
LocationAustralia, Queensland
Year1993
Situation(s)Wheat
Contributors - (Alphabetically)Steve Walker 
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NOTES ABOUT THIS BIOTYPE

AREAS FOUND

Steve Walker
South East Queensland - Australia.

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CROSS RESISTANCE

Steve Walker
Populations vary in their level of resistance to other ALS-inhibitors.

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ACADEMIC ASPECTS

Confirmation Tests

Field, and 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 Group B/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 B/2 resistant Wild Buckwheat from Queensland please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

STEVE WALKER
Principal Agronomist
Farming Systems Institute, Qdpi
Leslie Research Centre
303 North Roberts
PO Box 200201,
Toowoomba, 4350, Queensland
Australia
Email Steve Walker

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Queensland have been instrumental in providing you this information. Particular thanks is given to Steve Walker for providing detailed information.
Herbicide Resistant Wild Buckwheat Globally
(Polygonum convolvulus (=Fallopia convolvulus))
Herbicide Resistant Wild Buckwheat Globally
(Polygonum convolvulus (=Fallopia convolvulus))
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Herbicide Resistant Wild Buckwheat Globally
(Polygonum convolvulus (=Fallopia convolvulus))
#CountryFirstYearSituationActive IngredientsSite of Action
1 Australia (Queensland) AustraliaQueensland1993 Wheat chlorsulfuron 1 ALS inhibitors (B/2)
88Polygonum convolvulus (=Fallopia convolvulus)Wild Buckwheat9
2 AustriaAustria 1980 Corn (maize) atrazine 2 Photosystem II inhibitors (C1/5)
88Polygonum convolvulus (=Fallopia convolvulus)Wild Buckwheat434
3 Canada (Alberta) CanadaAlberta2007 Peas, and Wheat florasulam, thifensulfuron-methyl, and tribenuron-methyl 7 ALS inhibitors (B/2)
88Polygonum convolvulus (=Fallopia convolvulus)Wild Buckwheat5379
4 GermanyGermany 1988 Corn (maize) atrazine 18 Photosystem II inhibitors (C1/5)
88Polygonum convolvulus (=Fallopia convolvulus)Wild Buckwheat446
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