International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP B/2 RESISTANT RED RICE
(Oryza sativa var. sylvatica)


ALS inhibitors (B/2)

Colombia, Norte de Santander
INTRODUCTION RED RICE
Red Rice (Oryza sativa var. sylvatica) is a monocot weed in the Poaceae family.  In Colombia this weed first evolved resistance to Group B/2 herbicides in 2018 and infests Rice.   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 imazamox, and imazapyr 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.

If we do not have a picture for this weed, or you can provide a better picture (scan, digital camera etc) please please e-mail it to us.

QUIK STATS (last updated Sep 24, 2019 )

Common NameRed Rice
SpeciesOryza sativa var. sylvatica
GroupALS inhibitors (B/2)
Herbicidesimazamox, and imazapyr
LocationColombia, Norte de Santander
Year2018
Situation(s)Rice
Contributors - (Alphabetically)Veronica Hoyos, Guido Plaza, Maria del Mar Vanegas Alvares, and Juan Camilo Velásquez Rodríguez 
Edit this Case  |  Add New Case of Resistance  |  Add Note

ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Red Rice biotype with this Red Rice 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 Red Rice 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 B/2 resistant Red Rice from Colombia please update the database.
 
Edit Case  |  Add Note  |  Add Article  |  Add New Case  |  Help

CONTRIBUTING WEED SCIENTISTS

VERONICA HOYOS
Universidad Nacional de Colombia
Carrera 30 45-03 Edificio 500
Bogota, 111321, Cundinamarca
Colombia
Email Veronica Hoyos
GUIDO PLAZA
Associate Professor
Universidad Nacional de Colombia
Agronomy Department
Carrera 30 45-03 Edificio 500 Of 236
Bogotá, 111321, Cundinamarca
Colombia
Email Guido Plaza
Web   : Web Site Link
MARIA DEL MAR VANEGAS ALVARES
Agronomic Engineer
Universidad Nacional de Colombia
Agronomy Department
Carrera 30 45-03 Edificio 500
Bogota, 111321, Bogotá D.C
Colombia
Email Maria del Mar Vanegas Alvares
Web   : Web Site Link
JUAN CAMILO VELÁSQUEZ RODRÍGUEZ
Agronomic Engineer, Weed Science Student
Master degree student from Universidade Federal de Pelotas
Fitossanidade
(Centro de estudos em Herbologia, CEHERB)
Campus Capão do Leão
UFpel
Capão do Leão, 96160-000, Riogrande do Sul (RS)
Brazil
Email Juan Camilo Velásquez Rodríguez
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Colombia have been instrumental in providing you this information. Particular thanks is given to Veronica Hoyos, Guido Plaza, Maria del Mar Vanegas Alvares, and Juan Camilo Velásquez Rodríguez for providing detailed information.
Herbicide Resistant Red Rice Globally
(Oryza sativa var. sylvatica)
Herbicide Resistant Red Rice Globally
(Oryza sativa var. sylvatica)
Drag a column header and drop it here to group by that column
Herbicide Resistant Red Rice Globally
(Oryza sativa var. sylvatica)
#CountryFirstYearSituationActive IngredientsSite of Action
1 BrazilBrazil 2006 Rice imazapic, and imazethapyr 5 ALS inhibitors (B/2)
242Oryza sativa var. sylvaticaRed Rice5372
2 ColombiaColombia 2018 Rice imazamox, and imazapyr 10 ALS inhibitors (B/2)
242Oryza sativa var. sylvaticaRed Rice18170
3 Costa RicaCosta Rica 2010 Rice imazapic, and imazapyr 11 ALS inhibitors (B/2)
242Oryza sativa var. sylvaticaRed Rice7885
4 GreeceGreece 2013 Rice imazamox, and imazethapyr 19 ALS inhibitors (B/2)
242Oryza sativa var. sylvaticaRed Rice13054
5 ItalyItaly 2010 Rice imazamox 24 ALS inhibitors (B/2)
242Oryza sativa var. sylvaticaRed Rice5614
6 MalaysiaMalaysia 2018 Rice imazapic, and imazapyr 28 ALS inhibitors (B/2)
242Oryza sativa var. sylvaticaRed Rice17145
7 United States (Arkansas) United StatesArkansas2002 Rice imazamox, imazapyr, imazaquin, imazethapyr, and pyrithiobac-sodium 45 ALS inhibitors (B/2)
242Oryza sativa var. sylvaticaRed Rice13046
Literature about Similar Cases

Page size:
select
Page: of 25
Items 1 to 5 of 123

Page size:
select
Page: of 25
Items 1 to 5 of 123
PERMISSION MUST BE OBTAINED FIRST if you intend to base a significant portion of a scientific paper on data derived from this site.
Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Thursday, October 17, 2019 .  Available  www.weedscience.org
Copyright © 1993- 2019 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.