International Survey of Herbicide-Resistant Weeds

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


ALS inhibitors (B/2)

Brazil, Rio Grande do Sul
INTRODUCTION RED RICE
Red Rice (Oryza sativa var. sylvatica) is a monocot weed in the Poaceae family.  In Brazil this weed first evolved resistance to Group B/2 herbicides in 2006 and infests Rice.   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 imazapic, and imazethapyr 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 Apr 02, 2009 )

Common NameRed Rice
SpeciesOryza sativa var. sylvatica
GroupALS inhibitors (B/2)
Herbicidesimazapic, and imazethapyr
LocationBrazil, Rio Grande do Sul
Year2006
Situation(s)Rice
Contributors - (Alphabetically)Ives Goulart, Augusto Kalsing, Carlos Henrique Mariot, Valmir Menezes, Aldo Merotto, and Ana Carolina Roso 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse, and Laboratory trials comparing a known susceptible Red Rice biotype with this Red Rice 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 Red Rice indicate that the inheritance is determined by a one gene, dominant, nuclear trait.  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 Red Rice from Brazil 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 Red Rice from Brazil please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

IVES GOULART
Graduate Student
Universidade Federal Do Rio Grande Do Sul
Plantas De Lavoura
Av. Bento Gonçalves
7712
Porto Alegre, 91540-000 , Rio Grande Do Sul
Brazil
Email Ives Goulart
AUGUSTO KALSING
Agronomist, M.sc.st
University Federal At Rio Grande Do Sul
Crop Sciences Dept.
Av. Bento Gonçalves
7712
Porto Alegre, 90001-970, RS
Brazil
Email Augusto Kalsing
Web   : Web Site Link
CARLOS HENRIQUE MARIOT
researcher
Dow AgroSciences
CPR&D
Av. Frederico A. Ritter
3601, casa 192
Cachoeirinha, 94930-000, Rio Grande do Sul
Brazil
Email Carlos Henrique Mariot
Web   : Web Site Link
VALMIR MENEZES
Researcher
Rice Research Institute Of Rio Grande Do Sul
Agromony Dept.
Av. Bonifácio Carvalho Bernardes
1494
Cachoeirinha, 94930-030, RS
Brazil
Email Valmir Menezes
Web   : Web Site Link
ALDO MEROTTO
Professor
Universidade Federal Do Rio Grande Do Sul - Ufrgs
Plantas De Lavoura
7712 Bento Gonçalves. P. O. Box 15100
Porto Alegre, 91501970, RS
Brazil
Email Aldo Merotto
Web   : Web Site Link
ANA CAROLINA ROSO
Agronomist, M. Sc.
University Federal Of Rio Grande Do Sul
Crop Science
Dpto.
Av. Bento Gonçalves
7712
Poto Alegre, 91501-970, Rio Grande Do Sul
Brazil
Email Ana Carolina Roso
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Brazil have been instrumental in providing you this information. Particular thanks is given to Ives Goulart, Augusto Kalsing, Carlos Henrique Mariot, Valmir Menezes, Aldo Merotto, and Ana Carolina Roso 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 ALS inhibitors (B/2)
242Oryza sativa var. sylvaticaRed Rice5372
2 Costa RicaCosta Rica 2010 Rice imazapic, and imazapyr 11 ALS inhibitors (B/2)
242Oryza sativa var. sylvaticaRed Rice7885
3 GreeceGreece 2013 Rice imazamox, and imazethapyr 19 ALS inhibitors (B/2)
242Oryza sativa var. sylvaticaRed Rice13054
4 ItalyItaly 2010 Rice imazamox 24 ALS inhibitors (B/2)
242Oryza sativa var. sylvaticaRed Rice5614
5 MalaysiaMalaysia 2018 Rice imazapic, and imazapyr 28 ALS inhibitors (B/2)
242Oryza sativa var. sylvaticaRed Rice17145
6 United States (Arkansas) United StatesArkansas2002 Rice imazamox, imazapyr, imazaquin, imazethapyr, and pyrithiobac-sodium 45 ALS inhibitors (B/2)
242Oryza sativa var. sylvaticaRed Rice13046
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