International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP O/4 RESISTANT GULF COCKSPUR
(Echinochloa crus-pavonis)


Synthetic Auxins (O/4)

Brazil
INTRODUCTION GULF COCKSPUR
Gulf Cockspur (Echinochloa crus-pavonis) is a monocot weed in the Poaceae family.  In Brazil this weed first evolved resistance to Group O/4 herbicides in 1999 and infests Rice.   Group O/4 herbicides are known as Synthetic Auxins (Synthetic auxins (action like indoleacetic acid)).  Research has shown that these particular biotypes are resistant to quinclorac and they may be cross-resistant to other Group O/4 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 Sep 15, 2000 )

Common NameGulf Cockspur
SpeciesEchinochloa crus-pavonis
GroupSynthetic Auxins (O/4)
Herbicidesquinclorac
LocationBrazil
Year1999
Situation(s)Rice
Contributors - (Alphabetically)José Noldin 
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NOTES ABOUT THIS BIOTYPE

AREAS FOUND

José Noldin
The resistant weed was found in Tubarao, Santa Catarina

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GENERAL

José Noldin
This biotype was selected in fields intensively cultivated with irrigated rice (one crop per year) after applying quinclorac for several years).

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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Gulf Cockspur biotype with this Gulf Cockspur 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 O/4 resistant Gulf Cockspur 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 O/4 resistant Gulf Cockspur from Brazil please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

JOSÉ NOLDIN
Weed Scientist
Epagri - Agri. And Extn Inst. For Santa Catarina State
Itajai Experiment Station
Dept of Agronomy Horticulture
PO Box 830915, 362 Plant Science
Itajaí, 88301-970, Santa Catarina
Brazil
Email José Noldin

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 José Noldin for providing detailed information.
Herbicide Resistant Gulf Cockspur Globally
(Echinochloa crus-pavonis)
Herbicide Resistant Gulf Cockspur Globally
(Echinochloa crus-pavonis)
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Herbicide Resistant Gulf Cockspur Globally
(Echinochloa crus-pavonis)
#CountryFirstYearSituationActive IngredientsSite of Action
1 BrazilBrazil 1999 Rice quinclorac 5 Synthetic Auxins (O/4)
193Echinochloa crus-pavonisGulf Cockspur1190
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Saturday, August 24, 2019 .  Available  www.weedscience.org
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