International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP A/1 RESISTANT ALEXANDERGRASS
(Urochloa plantaginea (=Brachiaria plantaginea))


ACCase inhibitors (A/1)

Brazil, Paraná
INTRODUCTION ALEXANDERGRASS
Alexandergrass (Urochloa plantaginea (=Brachiaria plantaginea)) is a monocot weed in the Poaceae family.  In Brazil this weed first evolved resistance to Group A/1 herbicides in 1997 and infests Soybean.   Group A/1 herbicides are known as ACCase inhibitors (Inhibition of acetyl CoA carboxylase (ACCase)).  Research has shown that these particular biotypes are resistant to butroxydim, diclofop-methyl, fenoxaprop-P-ethyl, fluazifop-P-butyl, haloxyfop-methyl, propaquizafop, quizalofop-P-ethyl, and sethoxydim and they may be cross-resistant to other Group A/1 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 Jan 07, 2001 )

Common NameAlexandergrass
SpeciesUrochloa plantaginea (=Brachiaria plantaginea)
GroupACCase inhibitors (A/1)
Herbicidesbutroxydim, diclofop-methyl, fenoxaprop-P-ethyl, fluazifop-P-butyl, haloxyfop-methyl, propaquizafop, quizalofop-P-ethyl, and sethoxydim
LocationBrazil, Paraná
Year1997
Situation(s)Soybean
Contributors - (Alphabetically)Marcio Adoryan, Pedro Christoffoleti, Marluce Cortez, Gerson Gelmini, Maria Novo, Ricardo Victória, and Ribas Vidal 
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NOTES ABOUT THIS BIOTYPE

AREAS FOUND

Ribas Vidal
Guarapuava and Mangueiqinha

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ACADEMIC ASPECTS

Confirmation Tests

Field, Greenhouse, and Laboratory trials comparing a known susceptible Alexandergrass biotype with this Alexandergrass 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 A/1 resistant Alexandergrass indicate that the inheritance is determined by a 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 A/1 resistant Alexandergrass 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 A/1 resistant Alexandergrass from Brazil please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

MARCIO ADORYAN
Head of Early Development and Resistance Management
Bayer Cropscience
Agronomic Development
Rod. Doutor Roberto Moreira
5005 – EAE - CEAT
Paulinia, 13148-914, São Paulo
Brazil
Email Marcio Adoryan
PEDRO CHRISTOFFOLETI
Associate Professor III
Universidade de Sao Paulo
Crop Science Department
ESALQ - USP - LPV - Av. Padua Dias 11 - C. Postal 09
Piracicaba, 13418-900, São Paulo
Brazil
Email Pedro Christoffoleti
Web   : Web Site Link
MARLUCE CORTEZ
Weed Scientist
University Of South Brazil
Crop Science Department
2788 Waterpointe Cr
Piracicaba, 13418-900, São Paulo
Brazil
Email Marluce Cortez
Web   : Web Site Link
GERSON GELMINI
Weed Scientist
University Of South Brazil
Crop Science Department
945 Marion Street
Piracicaba, 13418-900, São Paulo
Brazil
Email Gerson Gelmini
Web   : Web Site Link
MARIA NOVO
Weed Scientist
University Of South Brazil
Crop Science Department
Department of Crop& Soil Sciences
115 Coastal Way, PO Box 748
Piracicaba, 13418-900, São Paulo
Brazil
Email Maria Novo
Web   : Web Site Link
RICARDO VICTÓRIA
Weed Scientist
University Of South Brazil
Crop Science Department
Dept of Plant Sciences
Piracicaba, 13418-900, São Paulo
Brazil
Email Ricardo Victória
Web   : Web Site Link
RIBAS VIDAL
Professor
Universidade Federal Do Rio Grande Do Sul
Plant Sciences
Rod. Carlos João Strass
Acesso Orlando, Cx Postal 231,
Porto Alegre, CEP 91001-970, RS
Brazil
Email Ribas Vidal
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 Marcio Adoryan, Pedro Christoffoleti, Marluce Cortez, Gerson Gelmini, Maria Novo, Ricardo Victória, and Ribas Vidal for providing detailed information.
Herbicide Resistant Alexandergrass Globally
(Urochloa plantaginea (=Brachiaria plantaginea))
Herbicide Resistant Alexandergrass Globally
(Urochloa plantaginea (=Brachiaria plantaginea))
Drag a column header and drop it here to group by that column
Herbicide Resistant Alexandergrass Globally
(Urochloa plantaginea (=Brachiaria plantaginea))
#CountryFirstYearSituationActive IngredientsSite of Action
1 BrazilBrazil 1997 Soybean butroxydim, diclofop-methyl, fenoxaprop-P-ethyl, fluazifop-P-butyl, haloxyfop-methyl, propaquizafop, quizalofop-P-ethyl, and sethoxydim 5 ACCase inhibitors (A/1)
34Urochloa plantaginea (=Brachiaria plantaginea)Alexandergrass498
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