International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
HRAC GROUP 2 (LEGACY B) RESISTANT RED RICE
(Oryza sativa var. sylvatica)


Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Colombia, Norte de Santander
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 imazamox, and imazapyr 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)
Herbicidesimazamox, and imazapyr
LocationBelgium
Year1996
Situation(s)Rice
Contributors - (Alphabetically)Veronica Hoyos, Guido Plaza, Maria del Mar Vanegas Alvares, and Juan Camilo Velásquez Rodríguez 
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ACADEMIC ASPECTS

Confirmation Tests

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

VERONICA HOYOS
Universidad del Magdalena
Engineering School
Calle 32 22-08
Santa Marta, 470004, Magdalena
Colombia
Email Veronica Hoyos
GUIDO PLAZA
Associate Professor
Universidad Nacional de Colombia
Agronomy Department
Carrera 30 45-03 Edificio 500 Of 236
Bogotá, 111321, Cundinamarca
Colombia
Email Guido Plaza
Web   : Web Site Link
MARIA DEL MAR VANEGAS ALVARES
Agronomic Engineer
Universidad Nacional de Colombia
Agronomy Department
Carrera 30 45-03 Edificio 500
Bogota, 111321, Bogotá D.C
Colombia
Email Maria del Mar Vanegas Alvares
Web   : Web Site Link
JUAN CAMILO VELÁSQUEZ RODRÍGUEZ
Agronomic Engineer, Weed Science Student
Master degree student from Universidade Federal de Pelotas
Fitossanidade
(Centro de estudos em Herbologia, CEHERB)
Campus Capão do Leão
UFpel
Capão do Leão, 96160-000, Riogrande do Sul (RS)
Brazil
Email Juan Camilo Velásquez Rodríguez
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 Veronica Hoyos, Guido Plaza, Maria del Mar Vanegas Alvares, and Juan Camilo Velásquez Rodríguez for providing detailed information.
Herbicide Resistant Red Rice Globally
(Oryza sativa var. sylvatica)
Herbicide Resistant Red Rice Globally
(Oryza sativa var. sylvatica)
Drag a column header and drop it here to group by that column
Herbicide Resistant Red Rice Globally
(Oryza sativa var. sylvatica)
#CountryFirstYearSituationActive IngredientsSite of Action
1 BrazilBrazil 2006 Rice imazapic, and imazethapyr 5 Inhibition of Acetolactate Synthase (B/2)
242Oryza sativa var. sylvaticaRed Rice5372
2 ColombiaColombia 2018 Rice imazamox, and imazapyr 10 Inhibition of Acetolactate Synthase (B/2)
242Oryza sativa var. sylvaticaRed Rice18170
3 Costa RicaCosta Rica 2010 Rice imazapic, and imazapyr 11 Inhibition of Acetolactate Synthase (B/2)
242Oryza sativa var. sylvaticaRed Rice7885
4 GreeceGreece 2013 Rice imazamox, and imazethapyr 19 Inhibition of Acetolactate Synthase (B/2)
242Oryza sativa var. sylvaticaRed Rice13054
5 ItalyItaly 2010 Rice imazamox 24 Inhibition of Acetolactate Synthase (B/2)
242Oryza sativa var. sylvaticaRed Rice5614
6 MalaysiaMalaysia 2018 Rice imazapic, and imazapyr 28 Inhibition of Acetolactate Synthase (B/2)
242Oryza sativa var. sylvaticaRed Rice17145
7 TurkeyTurkey 2020 Rice imazamox 71 Inhibition of Acetolactate Synthase (B/2)
242Oryza sativa var. sylvaticaRed Rice19217
8 United States (Arkansas) United StatesArkansas2002 Rice imazamox, imazapyr, imazaquin, imazethapyr, and pyrithiobac-sodium 45 Inhibition of Acetolactate Synthase (B/2)
242Oryza sativa var. sylvaticaRed Rice13046
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Thursday, June 17, 2021 .  Available  www.weedscience.org
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