HRAC GROUP 5 (LEGACY C1 C2) RESISTANT ROUGH SPRANGLETOP
(Leptochloa scabra)

PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)

Venezuela, Portuguesa

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INTRODUCTION ROUGH SPRANGLETOP Rough Sprangletop (Leptochloa scabra) is a monocot weed in the Poaceae family.  In Venezuela this weed first evolved resistance to Group 5 (Legacy C1 C2) herbicides in 2013 and infests Rice.   Group 5 (Legacy C1 C2) herbicides are known as PSII inhibitors - Serine 264 Binders (Inhbition of Photosynthesis at PSll - Serine 264 Binders ).  Research has shown that these particular biotypes are resistant to propanil and they may be cross-resistant to other Group 5 (Legacy C1 C2) 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.

QUIK STATS (last updated Feb 24, 2015 ) Common Name Rough Sprangletop Species Leptochloa scabra Group PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2) Herbicides propanil Location Venezuela, Portuguesa Year 2013 Situation(s) Rice Contributors - (Alphabetically) Luis Lopez, and Aida Ortiz  Edit this Case  |  Add New Case of Resistance  |  Add Note

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 HRAC Group 5 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 5 (Legacy C1 C2) resistant Rough Sprangletop from Venezuela please update the database.   Edit Case  |  Add Note  |  Add Article  |  Add New Case  |  Help

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) # Country Country StateName FirstYear Situation Active Ingredients CountryID Site of Action WeedID Species CommonName ResistID 1 Venezuela Venezuela   2013 Rice propanil 80 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2) 291 Leptochloa scabra Rough Sprangletop 6756

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