International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP B/2 RESISTANT BROAD-LEAVED DOCK
(Rumex obtusifolius)


ALS inhibitors (B/2)

France, Western France
INTRODUCTION BROAD-LEAVED DOCK
Broad-Leaved Dock (Rumex obtusifolius) is a dicot weed in the Polygonaceae family.  In France this weed first evolved resistance to Group B/2 herbicides in 2017 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 florasulam, metsulfuron-methyl, and thifensulfuron-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 Nov 19, 2019 )

Common NameBroad-Leaved Dock
SpeciesRumex obtusifolius
GroupALS inhibitors (B/2)
Herbicidesflorasulam, metsulfuron-methyl, and thifensulfuron-methyl
LocationFrance, Western France
Year2017
Situation(s)Wheat
Contributors - (Alphabetically)Christophe Délye 
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NOTES ABOUT THIS BIOTYPE

MECHANISM

Christophe Délye
Strong resistance to SU herbicides (metsulfuron, thifensulfuron) and to the TP (florasulame). This is TSR (ALS mutant is Trp574Leu). 

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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse, and Laboratory trials comparing a known susceptible Broad-Leaved Dock biotype with this Broad-Leaved Dock 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 Broad-Leaved Dock 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

Studies on the mechanism of resistance of Group B/2 resistant Broad-Leaved Dock from France indicate that resistance is due to an altered target site.  There may be a note below or an article discussing the mechanism of resistance in the Fact Sheets and Other Literature
 
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 Broad-Leaved Dock from France please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

CHRISTOPHE DÉLYE
Chargé de Recherches
INRA
Agroécologie
17 rue de Sully
Dijon, F-21000, Burgundy
France
Email Christophe Délye
Web   : Web Site Link

ACKNOWLEDGEMENTS

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 Broad-Leaved Dock Globally
(Rumex obtusifolius)
Herbicide Resistant Broad-Leaved Dock Globally
(Rumex obtusifolius)
Drag a column header and drop it here to group by that column
Herbicide Resistant Broad-Leaved Dock Globally
(Rumex obtusifolius)
#CountryFirstYearSituationActive IngredientsSite of Action
1 FranceFrance 2017 Wheat florasulam, metsulfuron-methyl, and thifensulfuron-methyl 17 ALS inhibitors (B/2)
349Rumex obtusifoliusBroad-Leaved Dock18178
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Saturday, December 7, 2019 .  Available  www.weedscience.org
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