INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

HRAC GROUP 9 (LEGACY G) RESISTANT GREATER BEGGARTICKS
(Bidens subalternans)


Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)

Brazil, Juranda, Paraná
INTRODUCTION GREATER BEGGARTICKS
Greater Beggarticks (Bidens subalternans) is a dicot weed in the Asteraceae family.  In Brazil this weed first evolved resistance to Group 9 (Legacy G) herbicides in 2023 and infests Corn (maize), and Soybean.   Group 9 (Legacy G) herbicides are known as Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (Inhibition of EPSP synthase).  Research has shown that these particular biotypes are resistant to glyphosate and they may be cross-resistant to other Group 9 (Legacy G) 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 Sep 05, 2023 )

Common NameGreater Beggarticks
SpeciesBidens subalternans
GroupInhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
Herbicidesglyphosate
LocationBrazil, Juranda, Paraná
Year2023
Situation(s)Corn (maize), and Soybean
Contributors - (Alphabetically)Fernando Adegas, João Carlos Bonani, Dionisio Gazziero, Bruno Lopes Paes, Rubem Oliveira, Marcos Vinicius Garbiate, and Carlos Vinicius Precinotto 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Greater Beggarticks biotype with this Greater Beggarticks 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 9 resistant Greater Beggarticks 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 9 (Legacy G) resistant Greater Beggarticks from Brazil please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

FERNANDO ADEGAS
Weed Scientist
Embrapa Soja
Weed Management
Rod. Carlos Joao Strass
Ac. Orlando Amaral. PO Box 231
Londrina, 86001-970, Paraná
Brazil
Email Fernando Adegas
Web   : Web Site Link
JOÃO CARLOS BONANI
Agronomist
COAMO
DETEC
Rua Fioravante João Ferri
99, Jardim Alvorada
Campo Mourão, 87308-445, Paraná
Brazil
Email João Carlos Bonani
Web   : Web Site Link
DIONISIO GAZZIERO
Research Associate
Embrapa
Soja
5825 South Bend Rd
86001-970 Londrina-Pr, 87308-445, Paraná
Brazil
Email Dionisio Gazziero
Web   : Web Site Link
BRUNO LOPES PAES
Agronomist
COAMO
DETEC
Rua Fioravante João Ferri
99, Jardim Alvorada
Campo Mourão, 87308-445, Paraná
Brazil
Email Bruno Lopes Paes
Web   : Web Site Link
RUBEM OLIVEIRA
Associate Professor
Universidade Estadual De Maringá - Departamento De Agronomia
Núcleo De Estudos Avançados Em Ciência Das Plantas Daninhas
Av. Colombo 5790
Maringá, 87020-900, Paraná
Brazil
Email Rubem Oliveira
Web   : Web Site Link
MARCOS VINICIUS GARBIATE
Agronomist
COAMO
DETEC
Rua Fioravante João Ferri
99, Jardim Alvorada
Campo Mourão, 87308-445, Paraná
Brazil
Email Marcos Vinicius Garbiate
Web   : Web Site Link
CARLOS VINICIUS PRECINOTTO
Agronomist
COAMO
DETEC
Rua Fioravante João Ferri
99, Jardim Alvorada
Campo Mourão, 87308-445, Paraná
Brazil
Email Carlos Vinicius Precinotto
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 Fernando Adegas, João Carlos Bonani, Dionisio Gazziero, Bruno Lopes Paes, Rubem Oliveira, Marcos Vinicius Garbiate, and Carlos Vinicius Precinotto for providing detailed information.
Herbicide Resistant Greater Beggarticks Globally
(Bidens subalternans)
Herbicide Resistant Greater Beggarticks Globally
(Bidens subalternans)
Drag a column header and drop it here to group by that column
Herbicide Resistant Greater Beggarticks Globally
(Bidens subalternans)
#CountryFirstYearSituationActive IngredientsSite of Action
1 BrazilBrazil 1996 Soybean chlorimuron-ethyl, imazethapyr, and nicosulfuron 5 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
194Bidens subalternansGreater Beggarticks1195
2 BrazilBrazil 2006 Corn (maize) atrazine, foramsulfuron, and iodosulfuron-methyl-Na 5 Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
194Bidens subalternansGreater Beggarticks5382
3 BrazilBrazil 2023 Corn (maize), and Soybean glyphosate 5 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
194Bidens subalternansGreater Beggarticks26263
4 ParaguayParaguay 2018 Soybean glyphosate 46 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
194Bidens subalternansGreater Beggarticks17150
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Heap, I.  The International Herbicide-Resistant Weed Database.  Online.  Saturday, October 12, 2024 .  Available  www.weedscience.org Copyright © 1993- 2024 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.