International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP G/9 RESISTANT GREATER BEGGARTICKS
(Bidens subalternans)


EPSP synthase inhibitors (G/9)

Paraguay, Naranjal, and Santa Rosa del Monday
INTRODUCTION GREATER BEGGARTICKS
Greater Beggarticks (Bidens subalternans) is a dicot weed in the Asteraceae family.  In Paraguay this weed first evolved resistance to Group G/9 herbicides in 2018 and infests Soybean.   Group G/9 herbicides are known as EPSP synthase inhibitors (Inhibition of EPSP synthase).  Research has shown that these particular biotypes are resistant to glyphosate and they may be cross-resistant to other Group G/9 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 Nov 09, 2018 )

Common NameGreater Beggarticks
SpeciesBidens subalternans
GroupEPSP synthase inhibitors (G/9)
Herbicidesglyphosate
LocationParaguay, Naranjal, and Santa Rosa del Monday
Year2018
Situation(s)Soybean
Contributors - (Alphabetically)Fernando Adegas, Jamil Constantin, Dionisio Gazziero, Rubem Oliveira, and Hudson Takano 
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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 Group G/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 G/9 resistant Greater Beggarticks from Paraguay 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
JAMIL CONSTANTIN
Associate Professor
Universidade Estadual de Maringá
Departamento de Agronomia
Av. Colombo
5790
Maringá, PR, 87020-900, Paraná
Brazil
Email Jamil Constantin
Web   : Web Site Link
DIONISIO GAZZIERO
Research Associate
Embrapa
Soja
5825 South Bend Rd
86001-970 Londrina-Pr, 87020-900, Paraná
Brazil
Email Dionisio Gazziero
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
HUDSON TAKANO
Graduate Student
Colorado State University
Bioagricultural Sciences and Pest Management
300 W Pitkin St
Fort Collins, 80521, Colorado
United States
Email Hudson Takano
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Paraguay have been instrumental in providing you this information. Particular thanks is given to Fernando Adegas, Jamil Constantin, Dionisio Gazziero, Rubem Oliveira, and Hudson Takano for providing detailed information.
Herbicide Resistant Greater Beggarticks Globally
(Bidens subalternans)
Herbicide Resistant Greater Beggarticks Globally
(Bidens subalternans)
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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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