International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP C2/7 RESISTANT ROUGH SPRANGLETOP
(Leptochloa scabra)


PSII inhibitor (Ureas and amides) (C2/7)

Venezuela, Portuguesa
INTRODUCTION ROUGH SPRANGLETOP
Rough Sprangletop (Leptochloa scabra) is a monocot weed in the Poaceae family.  In Venezuela this weed first evolved resistance to Group C2/7 herbicides in 2013 and infests Rice.   Group C2/7 herbicides are known as PSII inhibitor (Ureas and amides) (Inhibition of photosynthesis at photosystem II).  Research has shown that these particular biotypes are resistant to propanil and they may be cross-resistant to other Group C2/7 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 24, 2015 )

Common NameRough Sprangletop
SpeciesLeptochloa scabra
GroupPSII inhibitor (Ureas and amides) (C2/7)
Herbicidespropanil
LocationVenezuela, Portuguesa
Year2013
Situation(s)Rice
Contributors - (Alphabetically)Luis Lopez, and Aida Ortiz 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Rough Sprangletop biotype with this Rough Sprangletop 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 C2/7 resistant Rough Sprangletop 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 C2/7 resistant Rough Sprangletop from Venezuela please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

LUIS LOPEZ
Consultant
Laboratorio de Malezas
Agronomia
Universidad Central de Venezuela
Facultad de Agronomia, Avenida Universidad, El Limon,
Maracay, 2102, Aragua
Venezuela
Email Luis Lopez
AIDA ORTIZ
Professor
Universidad Central De Venezuela
Agronomia
Avenida Universidad. Campus Maracay
Maracay, 2101, Aragua
Venezuela
Email Aida Ortiz
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Venezuela have been instrumental in providing you this information. Particular thanks is given to Luis Lopez, and Aida Ortiz for providing detailed information.
Herbicide Resistant Rough Sprangletop Globally
(Leptochloa scabra)
Herbicide Resistant Rough Sprangletop Globally
(Leptochloa scabra)
Drag a column header and drop it here to group by that column
Herbicide Resistant Rough Sprangletop Globally
(Leptochloa scabra)
#CountryFirstYearSituationActive IngredientsSite of Action
1 VenezuelaVenezuela 2013 Rice propanil 80 PSII inhibitor (Ureas and amides) (C2/7)
291Leptochloa scabraRough Sprangletop6756
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Monday, December 16, 2019 .  Available  www.weedscience.org
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