International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP B/2 RESISTANT PALE SMARTWEED
(Polygonum lapathifolium)


ALS inhibitors (B/2)

Canada, Manitoba
INTRODUCTION PALE SMARTWEED
Pale Smartweed (Polygonum lapathifolium) is a dicot weed in the Polygonaceae family.  In Manitoba this weed first evolved resistance to Group B/2 herbicides in 2009 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 thifensulfuron-methyl, and tribenuron-methyl 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 Jan 19, 2014 )

Common NamePale Smartweed
SpeciesPolygonum lapathifolium
GroupALS inhibitors (B/2)
Herbicidesthifensulfuron-methyl, and tribenuron-methyl
LocationCanada, Manitoba
Year2009
Situation(s)Wheat
Contributors - (Alphabetically)Hugh Beckie 
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NOTES ABOUT THIS BIOTYPE

OTHER CONTACTS

Hugh Beckie
Haisheng Xie, Ag-Quest

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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Pale Smartweed biotype with this Pale Smartweed 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 Pale Smartweed 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 Pale Smartweed from Manitoba please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

HUGH BECKIE
Research Scientist
Agriculture & Agri-Food Canada, Science & Technology Branch
Herbicide-Resistant & Novel-Trait Plants
107 Science Place
Saskatoon, S7N 0X2, Saskatchewan
Canada
Email Hugh Beckie

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Manitoba have been instrumental in providing you this information. Particular thanks is given to Hugh Beckie for providing detailed information.
Herbicide Resistant Pale Smartweed Globally
(Polygonum lapathifolium)
Herbicide Resistant Pale Smartweed Globally
(Polygonum lapathifolium)
Drag a column header and drop it here to group by that column
Herbicide Resistant Pale Smartweed Globally
(Polygonum lapathifolium)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Canada (Manitoba) CanadaManitoba2009 Wheat thifensulfuron-methyl, and tribenuron-methyl 7 ALS inhibitors (B/2)
134Polygonum lapathifoliumPale Smartweed5625
2 Canada (Alberta) CanadaAlberta2014 Wheat imazethapyr 7 ALS inhibitors (B/2)
134Polygonum lapathifoliumPale Smartweed11002
3 Czech RepublicCzech Republic 1982 Railways atrazine, cyanazine, lenacil, prometryn, terbuthylazine, and terbutryn 12 Photosystem II inhibitors (C1/5)
134Polygonum lapathifoliumPale Smartweed80
4 FranceFrance 1979 Corn (maize), and Cropland atrazine 17 Photosystem II inhibitors (C1/5)
134Polygonum lapathifoliumPale Smartweed466
5 GermanyGermany 1988 Corn (maize) atrazine 18 Photosystem II inhibitors (C1/5)
134Polygonum lapathifoliumPale Smartweed445
6 SpainSpain 1991 Corn (maize) atrazine 38 Photosystem II inhibitors (C1/5)
134Polygonum lapathifoliumPale Smartweed189
Literature about Similar Cases

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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Saturday, April 29, 2017 .  Available  www.weedscience.org
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