International Survey of Herbicide-Resistant Weeds

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GROUP B/2 RESISTANT GREATER BEGGARTICKS
(Bidens subalternans)


ALS inhibitors (B/2)

Brazil, Mato Grosso do Sul
INTRODUCTION GREATER BEGGARTICKS
Greater Beggarticks (Bidens subalternans) is a dicot weed in the Asteraceae family.  In Brazil this weed first evolved resistance to Group B/2 herbicides in 1996 and infests Soybean.   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 chlorimuron-ethyl, imazethapyr, and nicosulfuron 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 Feb 25, 2003 )

Common NameGreater Beggarticks
SpeciesBidens subalternans
GroupALS inhibitors (B/2)
Herbicideschlorimuron-ethyl, imazethapyr, and nicosulfuron
LocationBrazil, Mato Grosso do Sul
Year1996
Situation(s)Soybean
Contributors - (Alphabetically)Marcio Adoryan, Pedro Christoffoleti, Marluce Cortez, Gerson Gelmini, Patricia Monquero, Maria Novo, and Ricardo Victória 
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NOTES ABOUT THIS BIOTYPE

AREAS FOUND

Marcio Adoryan
City: São Gasbriel do Oeste; State; Mato Grosso do Sul; Country; Brazil.

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GENERAL

Marcio Adoryan
This weed is a serious problem in mid west and other areas and these cases of resistence are increasing year by year. This species has been rarley mentioned because of its confusion with Bidens pilosa. The first trials were initiated in 1997/98 in field(São Gabriel do Oeste, MS) and in greenhouse (Cosmópolis, SP) and indicated resistence to ALS inhibitors. Remains susceptible to: fomesafen, lactofen, bentazon, glufosinato de amônio, glyphosate

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ACADEMIC ASPECTS

Confirmation Tests

Field, Greenhouse, and Laboratory 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 Group B/2 resistant Greater Beggarticks 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 B/2 resistant Greater Beggarticks 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 Greater Beggarticks 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
PATRICIA MONQUERO
Graduate Student
Esalq/usp/fapesp
Departamento De Producao Vegetal
PO Box 103
Piracicaba, 13418-900, SP
Brazil
Email Patricia Monquero
Web   : Web Site Link
MARIA NOVO
Graduate Student
Esalq/usp/fapesp
Departamento De Producao Vegetal
Department of Crop& Soil Sciences
115 Coastal Way, PO Box 748
Piracicaba, 13418-900, SP
Brazil
Email Maria Novo
Web   : Web Site Link
RICARDO VICTÓRIA
Graduate Student
Esalq/usp/fapesp
Departamento De Producao Vegetal
Dept of Plant Sciences
Piracicaba, 13418-900, SP
Brazil
Email Ricardo Victória
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, Patricia Monquero, Maria Novo, and Ricardo Victória 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 ALS inhibitors (B/2)
194Bidens subalternansGreater Beggarticks1195
2 BrazilBrazil 2006 Corn (maize) atrazine, foramsulfuron, and iodosulfuron-methyl-sodium 5 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
194Bidens subalternansGreater Beggarticks5382
3 ParaguayParaguay 2018 Soybean glyphosate 46 EPSP synthase inhibitors (G/9)
194Bidens subalternansGreater Beggarticks17150
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Wednesday, September 18, 2019 .  Available  www.weedscience.org
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