INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

HRAC GROUP 4 (LEGACY O) RESISTANT GOOSEWEED
(Sphenoclea zeylanica)


Auxin Mimics HRAC Group 4 (Legacy O)

Malaysia
INTRODUCTION GOOSEWEED
Gooseweed (Sphenoclea zeylanica) is a dicot weed in the Sphenocleaceae family.  In Malaysia this weed first evolved resistance to Group 4 (Legacy O) herbicides in 1995 and infests Rice.   Group 4 (Legacy O) herbicides are known as Auxin Mimics (Auxin Mimics ).  Research has shown that these particular biotypes are resistant to 2,4-D and they may be cross-resistant to other Group 4 (Legacy O) 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 NameGooseweed
SpeciesSphenoclea zeylanica
GroupAuxin Mimics HRAC Group 4 (Legacy O)
Herbicides2,4-D
LocationMalaysia
Year1995
Situation(s)Rice
Contributors - (Alphabetically)Kazuyuki Itoh 
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NOTES ABOUT THIS BIOTYPE

GENERAL

Kazuyuki Itoh
Booklet called : Trends in Rice Production and Weed Control in Asia. Kazuyuki Itoh, Department of LowLand Farming, Tohoku National Agricultural Experiment Station, Ministry of Agriculture, Forestry and Fisheries.

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ACADEMIC ASPECTS

Confirmation Tests

Field, and Greenhouse trials comparing a known susceptible Gooseweed biotype with this Gooseweed 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 4 resistant Gooseweed 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 4 (Legacy O) resistant Gooseweed from Malaysia please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

KAZUYUKI ITOH
Professor
Kobe University
Graduate School of Agricultural Science
1-1 Rokkodaicho
Kobe, 657-0013, Hyogo
Japan
Email Kazuyuki Itoh

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Malaysia have been instrumental in providing you this information. Particular thanks is given to Kazuyuki Itoh for providing detailed information.
Herbicide Resistant Gooseweed Globally
(Sphenoclea zeylanica)
Herbicide Resistant Gooseweed Globally
(Sphenoclea zeylanica)
Drag a column header and drop it here to group by that column
Herbicide Resistant Gooseweed Globally
(Sphenoclea zeylanica)
#CountryFirstYearSituationActive IngredientsSite of Action
1 MalaysiaMalaysia 1995 Rice 2,4-D 28 Auxin Mimics ( HRAC Group 4 (Legacy O)
167Sphenoclea zeylanicaGooseweed131
2 PhilippinesPhilippines 1983 Rice 2,4-D 32 Auxin Mimics ( HRAC Group 4 (Legacy O)
167Sphenoclea zeylanicaGooseweed162
3 ThailandThailand 2000 Rice 2,4-D 47 Auxin Mimics ( HRAC Group 4 (Legacy O)
167Sphenoclea zeylanicaGooseweed5146
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Heap, I.  The International Herbicide-Resistant Weed Database.  Online.  Sunday, December 1, 2024 .  Available  www.weedscience.org Copyright © 1993- 2024 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.