International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP B/2 RESISTANT COMMON HEMPNETTLE
(Galeopsis tetrahit)


ALS inhibitors (B/2)

Canada, Manitoba
INTRODUCTION COMMON HEMPNETTLE
Common Hempnettle (Galeopsis tetrahit) is a dicot weed in the Lamiaceae family.  In Manitoba this weed first evolved resistance to Group B/2 herbicides in 1995 and infests Cereals, and 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 metsulfuron-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 Jun 06, 2000 )

Common NameCommon Hempnettle
SpeciesGaleopsis tetrahit
GroupALS inhibitors (B/2)
Herbicidesmetsulfuron-methyl
LocationCanada, Manitoba
Year1995
Situation(s)Cereals, and Wheat
Contributors - (Alphabetically)Lyle Friesen, and Rene Van Acker 
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NOTES ABOUT THIS BIOTYPE

CROSS RESISTANCE

Lyle Friesen
Determining cross-resistance patterns.

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ACADEMIC ASPECTS

Confirmation Tests

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

LYLE FRIESEN
University Of Manitoba
Agriculture Bldg
Rua Hugo Cabral 1065 Apto 301
Winnipeg, R3T 2N2, Manitoba
Canada
Email Lyle Friesen
RENE VAN ACKER
University Of Manitoba
Agriculture Bldg
1608 McClaren Dr.
Winnipeg, R3T 2N2, Manitoba
Canada
Email Rene Van Acker

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 Lyle Friesen, and Rene Van Acker for providing detailed information.
Herbicide Resistant Common Hempnettle Globally
(Galeopsis tetrahit)
Herbicide Resistant Common Hempnettle Globally
(Galeopsis tetrahit)
Drag a column header and drop it here to group by that column
Herbicide Resistant Common Hempnettle Globally
(Galeopsis tetrahit)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Canada (Manitoba) CanadaManitoba1995 Cereals, and Wheat metsulfuron-methyl 7 ALS inhibitors (B/2)
91Galeopsis tetrahitCommon Hempnettle476
2 Canada (Alberta) CanadaAlberta1998 Cereals, Cropland, Spring Barley, and Wheat dicamba, fluroxypyr, and MCPA 7 Synthetic Auxins (O/4)
91Galeopsis tetrahitCommon Hempnettle1154
3 Canada (Alberta) CanadaAlberta2006 Cereals thifensulfuron-methyl, and tribenuron-methyl 7 ALS inhibitors (B/2)
91Galeopsis tetrahitCommon Hempnettle5320
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Thursday, March 23, 2017 .  Available  www.weedscience.org
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