(Galium spurium)

ALS inhibitors (B/2)

Canada, Saskatchewan
False Cleavers (Galium spurium) is a dicot weed in the Rubiaceae family.  In Saskatchewan this weed first evolved resistance to Group B/2 herbicides in 2006 and infests Spring Barley, 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 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 NameFalse Cleavers
SpeciesGalium spurium
GroupALS inhibitors (B/2)
Herbicidesthifensulfuron-methyl, and tribenuron-methyl
LocationCanada, Saskatchewan
Situation(s)Spring Barley, and Wheat
Contributors - (Alphabetically)Hugh Beckie 
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Confirmation Tests

Greenhouse trials comparing a known susceptible False Cleavers biotype with this False Cleavers biotype have been used to confirm resistance. For further information on the tests conducted please contact the local weed scientists that provided this information.

Genetic studies on Group B/2 resistant False Cleavers 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 False Cleavers from Saskatchewan please update the database.
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Research Scientist
Agriculture & Agri-Food Canada, Science & Technology Branch
Herbicide-Resistant & Novel-Trait Plants
107 Science Place
Saskatoon, S7N 0X2, Saskatchewan
Email Hugh Beckie


The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Saskatchewan have been instrumental in providing you this information. Particular thanks is given to Hugh Beckie for providing detailed information.
Herbicide Resistant False Cleavers Globally
(Galium spurium)
Herbicide Resistant False Cleavers Globally
(Galium spurium)
Drag a column header and drop it here to group by that column
Herbicide Resistant False Cleavers Globally
(Galium spurium)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Canada (Alberta) CanadaAlberta1996 Canola, Cereals, and Wheat imazethapyr, metsulfuron-methyl, quinclorac, sulfometuron-methyl, thifensulfuron-methyl, triasulfuron, and tribenuron-methyl 7 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
Synthetic Auxins (O/4)
93Galium spuriumFalse Cleavers508
2 Canada (Saskatchewan) CanadaSaskatchewan2006 Spring Barley, and Wheat thifensulfuron-methyl, and tribenuron-methyl 7 ALS inhibitors (B/2)
93Galium spuriumFalse Cleavers5321
3 Canada (Manitoba) CanadaManitoba2008 Canola thifensulfuron-methyl, and tribenuron-methyl 7 ALS inhibitors (B/2)
93Galium spuriumFalse Cleavers5629
Literature about Similar Cases

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PERMISSION MUST BE OBTAINED FIRST if you intend to base a significant portion of a scientific paper on data derived from this site. Citation:
Heap, I.  The International Herbicide-Resistant Weed Database.  Online.  Saturday, October 31, 2020 .  Available Copyright © 1993- 2020 All rights reserved. Fair use of this material is encouraged. Proper citation is requested.