International Survey of Herbicide-Resistant Weeds

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(Spergula arvensis)

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Corn Spurry (Spergula arvensis) is a dicot weed in the Caryophyllaceae family.  In Norway this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2006 and infests Winter barley, and Winter 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, 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.

If we do not have a picture for this weed, or you can provide a better picture (scan, digital camera etc) please please e-mail it to us.

QUIK STATS (last updated Mar 09, 2015 )

Common NameCorn Spurry
SpeciesSpergula arvensis
GroupInhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicidesflorasulam, and tribenuron-methyl
Situation(s)Winter barley, and Winter wheat
Contributors - (Alphabetically)Jan Netland 
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Confirmation Tests

Greenhouse, and Laboratory trials comparing a known susceptible Corn Spurry biotype with this Corn Spurry 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 HRAC Group 2 resistant Corn Spurry 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 Corn Spurry from Norway please update the database.
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The Norwegian Crop Research Institute
Plant Protection Centre
Department Of Herbology
Exotic & Invasive Weed Research
One Shields Ave, Mail Stop 4
Fellesbygget, N-1432, ÅS
Email Jan Netland


The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Norway have been instrumental in providing you this information. Particular thanks is given to Jan Netland for providing detailed information.
Herbicide Resistant Corn Spurry Globally
(Spergula arvensis)
Herbicide Resistant Corn Spurry Globally
(Spergula arvensis)
Drag a column header and drop it here to group by that column
Herbicide Resistant Corn Spurry Globally
(Spergula arvensis)
#CountryFirstYearSituationActive IngredientsSite of Action
1 NorwayNorway 2006 Winter barley, and Winter wheat florasulam, and tribenuron-methyl 31 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
326Spergula arvensisCorn Spurry10974
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