International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
HRAC GROUP 9 (LEGACY G) RESISTANT RADIATE FINGERGRASS
(Chloris radiata)

Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)

Colombia, Tolima
INTRODUCTION RADIATE FINGERGRASS
Radiate Fingergrass (Chloris radiata) is a monocot weed in the Poaceae family.  In Colombia this weed first evolved resistance to Group 9 (Legacy G) herbicides in 2019 and infests Rice.   Group 9 (Legacy G) herbicides are known as Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (Inhibition of EPSP synthase).  Research has shown that these particular biotypes are resistant to glyphosate and they may be cross-resistant to other Group 9 (Legacy G) 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 NameRadiate Fingergrass
SpeciesChloris radiata
GroupInhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
Herbicidesglyphosate
LocationColombia, Tolima
Year2019
Situation(s)Rice
Contributors - (Alphabetically)Rafael De Prado, Veronica Hoyos, and Guido Plaza 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Radiate Fingergrass biotype with this Radiate Fingergrass 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 9 resistant Radiate Fingergrass 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 9 (Legacy G) resistant Radiate Fingergrass from Colombia please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

RAFAEL DE PRADO
Universidad De Cordoba
Qvimica Agricola Y Edafologa
E T S Ingenieros Agronomos
PO Box 119
Cordoba, E-14080, Andalusia
Spain
Email Rafael De Prado
VERONICA HOYOS
Universidad del Magdalena
Engineering School
Calle 32 22-08
Santa Marta, 470004, Magdalena
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

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 Rafael De Prado, Veronica Hoyos, and Guido Plaza for providing detailed information.
Herbicide Resistant Radiate Fingergrass Globally
(Chloris radiata)
Herbicide Resistant Radiate Fingergrass Globally
(Chloris radiata)
Drag a column header and drop it here to group by that column
Herbicide Resistant Radiate Fingergrass Globally
(Chloris radiata)
#CountryFirstYearSituationActive IngredientsSite of Action
1 ColombiaColombia 2019 Rice glyphosate 10 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
 		340Chloris radiataRadiate Fingergrass18165
2 ColombiaColombia 2019 Rice glyphosate, and imazamox 10 Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
 		340Chloris radiataRadiate Fingergrass19224
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Friday, October 31, 2025 .  Available  www.weedscience.org
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