<b>HRAC Group 5</b> <font size='2'> (Legacy C1 C2) </font> resistant Leptochloa scabra from Venezuela

INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

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

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

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 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
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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 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.

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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.

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Herbicide Resistant Rough Sprangletop Globally
(Leptochloa scabra)

Country

FirstYear

Situation

Active Ingredients

Site of Action

Venezuela

2013

Rice

propanil

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

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PERMISSION MUST BE OBTAINED FIRST if you intend to base a significant portion of a scientific paper on data derived from this site. Citation:
Heap, I. The International Herbicide-Resistant Weed Database. Online. Thursday, November 21, 2024 . Available www.weedscience.org Copyright © 1993- 2024 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.