International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
HRAC GROUP 1 (LEGACY A) RESISTANT SOURGRASS
(Digitaria insularis)


Inhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)

Brazil, Midwest Region
INTRODUCTION SOURGRASS
Sourgrass (Digitaria insularis) is a monocot weed in the Poaceae family.  In Brazil this weed first evolved resistance to Group 1 (Legacy A) herbicides in 2016 and infests Soybean.   Group 1 (Legacy A) herbicides are known as Inhibition of Acetyl CoA Carboxylase (Inhibition of Acetyl CoA Carboxylase ).  Research has shown that these particular biotypes are resistant to fenoxaprop-ethyl, and haloxyfop-methyl and they may be cross-resistant to other Group 1 (Legacy A) 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 Jul 19, 2016 )

Common NameSourgrass
SpeciesDigitaria insularis
GroupInhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)
Herbicidesfenoxaprop-ethyl, and haloxyfop-methyl
LocationBrazil, Midwest Region
Year2016
Situation(s)Soybean
Contributors - (Alphabetically)Marcel Sereguin Cabral de Melo 
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NOTES ABOUT THIS BIOTYPE

OTHER CONTACTS

Marcel Sereguin Cabral de Melo

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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse, and Laboratory trials comparing a known susceptible Sourgrass biotype with this Sourgrass 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 resistant Sourgrass 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 Group 1 (Legacy A) resistant Sourgrass from Brazil please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

MARCEL SEREGUIN CABRAL DE MELO
Weed Resistance Monitoring Specialist
Bayer
Plant growth
5005, Dr. Roberto Moreira avenue
Bairro Recanto dos pássaros, Setor EAE
Paulínia, 13148-914, Sao Paulo
Brazil
Email Marcel Sereguin Cabral de Melo
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 Marcel Sereguin Cabral de Melo for providing detailed information.
Herbicide Resistant Sourgrass Globally
(Digitaria insularis)
Herbicide Resistant Sourgrass Globally
(Digitaria insularis)
Drag a column header and drop it here to group by that column
Herbicide Resistant Sourgrass Globally
(Digitaria insularis)
#CountryFirstYearSituationActive IngredientsSite of Action
1 ArgentinaArgentina 2014 Soybean glyphosate 48 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
239Digitaria insularisSourgrass13049
2 BrazilBrazil 2008 Corn (maize), and Soybean glyphosate 5 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
239Digitaria insularisSourgrass5350
3 BrazilBrazil 2016 Soybean fenoxaprop-ethyl, and haloxyfop-methyl 5 Inhibition of Acetyl CoA Carboxylase ( HRAC Group 1 (Legacy A)
239Digitaria insularisSourgrass13043
4 BrazilBrazil 2020 Soybean fenoxaprop-ethyl, glyphosate, and haloxyfop-methyl 5 Multiple Resistance: 2 Sites of Action
Inhibition of Acetyl CoA Carboxylase ( HRAC Group 1 (Legacy A)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
239Digitaria insularisSourgrass19212
5 ParaguayParaguay 2005 Corn (maize), Cotton, Soybean, and Sunflower glyphosate 46 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
239Digitaria insularisSourgrass5351
6 ParaguayParaguay 2020 Soybean clethodim, glyphosate, and haloxyfop-methyl 46 Multiple Resistance: 2 Sites of Action
Inhibition of Acetyl CoA Carboxylase ( HRAC Group 1 (Legacy A)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
239Digitaria insularisSourgrass20223
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