International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
(Galinsoga parviflora)

ALS inhibitors (B/2)

Gallant Soldier (Galinsoga parviflora) is a dicot weed in the Asteraceae family.  In France this weed first evolved resistance to Group B/2 herbicides in 2018 and infests Endive.   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 penoxsulam, and rimsulfuron 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.

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 May 13, 2019 )

Common NameGallant Soldier
SpeciesGalinsoga parviflora
GroupALS inhibitors (B/2)
Herbicidespenoxsulam, and rimsulfuron
Contributors - (Alphabetically)Christophe Délye 
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Confirmation Tests

Field, and Greenhouse trials comparing a known susceptible Gallant Soldier biotype with this Gallant Soldier 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 Gallant Soldier 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 Gallant Soldier from France please update the database.
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Chargé De Recherches
UMR Biologie et Gestion des Adventices
17 rue Sully
Dijon, B.P.86510, Burgundy
Email Christophe Délye
Web   : Web Site Link


The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in France have been instrumental in providing you this information. Particular thanks is given to Christophe Délye for providing detailed information.
Herbicide Resistant Gallant Soldier Globally
(Galinsoga parviflora)
Herbicide Resistant Gallant Soldier Globally
(Galinsoga parviflora)
Drag a column header and drop it here to group by that column
Herbicide Resistant Gallant Soldier Globally
(Galinsoga parviflora)
#CountryFirstYearSituationActive IngredientsSite of Action
1 FranceFrance 2018 Endive penoxsulam, and rimsulfuron 17 ALS inhibitors (B/2)
339Galinsoga parvifloraGallant Soldier18162
Literature about Similar Cases

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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Wednesday, September 18, 2019 .  Available
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