International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
MULTIPLE RESISTANT SLENDER AMARANTH
(Amaranthus viridis)


Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)

Brazil
INTRODUCTION SLENDER AMARANTH
Slender Amaranth (Amaranthus viridis) is a dicot weed in the Amaranthaceae family.  In Brazil this weed first evolved multiple resistance (to 2 herbicide sites of action) in 2011 and infests Cotton.  Multiple resistance has evolved to herbicides in the Groups B/2, and C1/5.  These particular biotypes are known to have resistance to atrazine, prometryn, and trifloxysulfuron-sodium and they may be cross-resistant to other herbicides in the Groups B/2, and C1/5.

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 Apr 10, 2013 )

Common NameSlender Amaranth
SpeciesAmaranthus viridis
GroupALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
Herbicidesatrazine, prometryn, and trifloxysulfuron-sodium
LocationBrazil
Year2011
Situation(s)Cotton
Contributors - (Alphabetically)Jamil Constantin, Alessandra Constantin Francischini, and Rubem Oliveira 
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NOTES ABOUT THIS BIOTYPE

GENERAL

Alessandra Constantin Francischini

FIRST REPORT OF Amaranthus viridis RESISTANCE TO HERBICIDES
Primeiro Relato de Resistência de Amaranthus viridis a Herbicidas
FRANCISCHINI, A.C., CONSTANTIN, J., OLIVEIRA JR., R.S., SANTOS, G., BRAZ, G.B.P., and DAN, H.A.
Planta Daninha, Viçosa-MG, v. 32, n. 3, p. 571-578, 2014

 Get PDF of Paper Here

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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Slender Amaranth biotype with this Slender Amaranth 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, C1/2, 5 resistant Slender Amaranth 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

Triazine resistant weeds often exhibit a lower relative fitness when compared to susceptible biotypes.  The most common mutation conferring triazine resistance (Ser 264 to Gly mutation of the psbA gene) also causes a reduction in CO2 fixation, quantum yield, and seed and biomass production.  There is no record in this database referring specifically to fitness studies on multiple resistant Slender Amaranth from Brazil.
 
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CONTRIBUTING WEED SCIENTISTS

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
ALESSANDRA CONSTANTIN FRANCISCHINI
Weed Research
Universidade Estadual De Maringá
Department Of Weed Control
Rua Saadeddini Ali Wardeni
Maringá, 87060-250, Paraná
Brazil
Email Alessandra Constantin Francischini
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

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 Jamil Constantin, Alessandra Constantin Francischini, and Rubem Oliveira for providing detailed information.
Herbicide Resistant Slender Amaranth Globally
(Amaranthus viridis)
Herbicide Resistant Slender Amaranth Globally
(Amaranthus viridis)
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Herbicide Resistant Slender Amaranth Globally
(Amaranthus viridis)
#CountryFirstYearSituationActive IngredientsSite of Action
1 BrazilBrazil 2011 Cotton atrazine, prometryn, and trifloxysulfuron-sodium 5 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
287Amaranthus viridisSlender Amaranth5735
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