International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
HRAC GROUP 2 (LEGACY B) RESISTANT REDSTEM
(Ammannia coccinea)


Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

United States, California
INTRODUCTION BLACKGRASS
Blackgrass (Alopecurus myosuroides) is a monocot weed in the Poaceae family.  In Belgium this weed first evolved multiple resistance (to 4 herbicide sites of action) in 1996 and infests Rice.  Multiple resistance has evolved to herbicides in the Groups 1 (Legacy A), Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B), PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2), and Inhibition of Microtubule Assembly 2 HRAC Group 3 (Legacy K1).  These particular biotypes are known to have resistance to bensulfuron-methyl and they may be cross-resistant to other herbicides in the Groups 1 (Legacy A), Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B), PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2), and Inhibition of Microtubule Assembly 2 HRAC Group 3 (Legacy K1).

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 21, 2000 )

Common NameBlackgrass
SpeciesAlopecurus myosuroides
GroupInhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)

Inhibition of Microtubule Assembly 2 HRAC Group 3 (Legacy K1)
Herbicidesbensulfuron-methyl
LocationBelgium
Year1996
Situation(s)Rice
Contributors - (Alphabetically)Jim Hill 
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ACADEMIC ASPECTS

Confirmation Tests

Field, and Greenhouse trials comparing a known susceptible Blackgrass biotype with this Blackgrass 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 HRAC Group 1, 2, 5, 3 resistant Blackgrass 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 multiple resistant Blackgrass from Belgium please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

JIM HILL
CE Specialist
University Of California
Agriculture and Natural Resources
One Shields Avenue
177 Hunt Hall
Davis, 95616, California
United States
Email Jim Hill
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Belgium have been instrumental in providing you this information. Particular thanks is given to Jim Hill for providing detailed information.
Herbicide Resistant Redstem Globally
(Ammannia coccinea)
Herbicide Resistant Redstem Globally
(Ammannia coccinea)
Drag a column header and drop it here to group by that column
Herbicide Resistant Redstem Globally
(Ammannia coccinea)
#CountryFirstYearSituationActive IngredientsSite of Action
1 JapanJapan 2004 Rice bensulfuron-methyl 25 Inhibition of Acetolactate Synthase (B/2)
209Ammannia coccineaRedstem7791
2 United States (California) United StatesCalifornia2000 Rice bensulfuron-methyl 45 Inhibition of Acetolactate Synthase (B/2)
209Ammannia coccineaRedstem5135
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Sunday, June 13, 2021 .  Available  www.weedscience.org
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