INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

HRAC GROUP 2 (LEGACY B) RESISTANT SARAMOLLAGRASS
(Ischaemum rugosum)


Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Colombia, Ariari region
INTRODUCTION SARAMOLLAGRASS
Saramollagrass (Ischaemum rugosum) is a monocot weed in the Poaceae family.  In Colombia this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2009 and infests Rice.   Group 2 (Legacy B) herbicides are known as Inhibition of Acetolactate Synthase (Inhibition of Acetolactate Synthase ).  Research has shown that these particular biotypes are resistant to bispyribac-sodium and they may be cross-resistant to other Group 2 (Legacy B) 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 Jul 31, 2019 )

Common NameSaramollagrass
SpeciesIschaemum rugosum
GroupInhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicidesbispyribac-sodium
LocationColombia, Ariari region
Year2009
Situation(s)Rice
Contributors - (Alphabetically)Felix Hernandez, and Guido Plaza 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Saramollagrass biotype with this Saramollagrass 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 HRAC Group 2 resistant Saramollagrass 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 2 (Legacy B) resistant Saramollagrass from Colombia please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

FELIX HERNANDEZ
investigación arroz
Fedearroz
Tecnico Fisiología
Kra 10 # 25-52 barrio Progreso
Granada-Meta, 057
Colombia
Email Felix Hernandez
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

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 Felix Hernandez, and Guido Plaza for providing detailed information.
Herbicide Resistant Saramollagrass Globally
(Ischaemum rugosum)
Herbicide Resistant Saramollagrass Globally
(Ischaemum rugosum)
Drag a column header and drop it here to group by that column
Herbicide Resistant Saramollagrass Globally
(Ischaemum rugosum)
#CountryFirstYearSituationActive IngredientsSite of Action
1 ColombiaColombia 2000 Rice fenoxaprop-ethyl 10 Inhibition of Acetyl CoA Carboxylase ( HRAC Group 1 (Legacy A)
99Ischaemum rugosumSaramollagrass5143
2 ColombiaColombia 2009 Rice bispyribac-sodium 10 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
99Ischaemum rugosumSaramollagrass18166
3 MalaysiaMalaysia 1989 Rubber, and Vegetables paraquat 28 PS I Electron Diversion ( HRAC Group 22 (Legacy D)
99Ischaemum rugosumSaramollagrass139
4 VenezuelaVenezuela 2004 Rice bispyribac-sodium, fenoxaprop-ethyl, imazapyr, imazethapyr, profoxydim, propanil, and pyribenzoxim 80 Multiple Resistance: 3 Sites of Action
Inhibition of Acetyl CoA Carboxylase ( HRAC Group 1 (Legacy A)
Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
99Ischaemum rugosumSaramollagrass5552
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Heap, I.  The International Herbicide-Resistant Weed Database.  Online.  Wednesday, December 4, 2024 .  Available  www.weedscience.org Copyright © 1993- 2024 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.