INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

GROUP G/9 RESISTANT WILD POINSETTIA
(Euphorbia heterophylla)


EPSP synthase inhibitors (G/9)

Brazil, Parana State
INTRODUCTION WILD POINSETTIA
Wild Poinsettia (Euphorbia heterophylla) is a dicot weed in the Euphorbiaceae family.  In Brazil this weed first evolved resistance to Group G/9 herbicides in 2019 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 Feb 04, 2021 )

Common NameWild Poinsettia
SpeciesEuphorbia heterophylla
GroupEPSP synthase inhibitors (G/9)
Herbicidesglyphosate
LocationBrazil, Parana State
Year2019
Situation(s)Soybean
Contributors - (Alphabetically)Fernando Adegas, Dionisio Gazziero, Rafael Mendes, Rubem Oliveira, and Luciano Rodrigues 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse, and Laboratory trials comparing a known susceptible Wild Poinsettia biotype with this Wild Poinsettia 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 Wild Poinsettia 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 Wild Poinsettia 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
DIONISIO GAZZIERO
Research Associate
Embrapa
Soja
5825 South Bend Rd
86001-970 Londrina-Pr, 86001-970, Paraná
Brazil
Email Dionisio Gazziero
Web   : Web Site Link
RAFAEL MENDES
phD student
Maringá State University
Agronomy Department
5790 Colombo Ave.
Maringá, 87020900, PR
Brazil
Email Rafael Mendes
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, PR
Brazil
Email Rubem Oliveira
Web   : Web Site Link
LUCIANO RODRIGUES
Agronomist
COCARI - Cooperativa Agropecuária e Industrial
Technical Departament
420, Lord Lovat Street. Jardim Esplanada
Mandaguari, 86975-000, Parana State
Brazil
Email Luciano Rodrigues
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, Dionisio Gazziero, Rafael Mendes, Rubem Oliveira, and Luciano Rodrigues for providing detailed information.
Herbicide Resistant Wild Poinsettia Globally
(Euphorbia heterophylla)
Herbicide Resistant Wild Poinsettia Globally
(Euphorbia heterophylla)
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Herbicide Resistant Wild Poinsettia Globally
(Euphorbia heterophylla)
#CountryFirstYearSituationActive IngredientsSite of Action
1 BrazilBrazil 1993 Soybean chlorimuron-ethyl, cloransulam-methyl, imazamox, imazaquin, and imazethapyr 5 ALS inhibitors (B/2)
87Euphorbia heterophyllaWild Poinsettia5294
2 BrazilBrazil 2004 Corn (maize), and Soybean acifluorfen-sodium, cloransulam-methyl, diclosulam, flumetsulam, flumiclorac-pentyl, fomesafen, imazethapyr, lactofen, metsulfuron-methyl, nicosulfuron, and saflufenacil 5 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
PPO inhibitors (E/14)
87Euphorbia heterophyllaWild Poinsettia5215
3 BrazilBrazil 2019 Soybean glyphosate 5 EPSP synthase inhibitors (G/9)
87Euphorbia heterophyllaWild Poinsettia19213
4 EcuadorEcuador 1990 Corn (maize), and Soybean linuron 14 PSII inhibitor (Ureas and amides) (C2/7)
87Euphorbia heterophyllaWild Poinsettia87
5 ParaguayParaguay 1995 Soybean imazethapyr 46 ALS inhibitors (B/2)
87Euphorbia heterophyllaWild Poinsettia1162
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Heap, I.  The International Herbicide-Resistant Weed Database.  Online.  Thursday, March 4, 2021 .  Available  www.weedscience.org Copyright © 1993- 2021 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.