International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP O/4 RESISTANT GOOSEWEED
(Sphenoclea zeylanica)


Synthetic Auxins (O/4)

Philippines
INTRODUCTION GOOSEWEED
Gooseweed (Sphenoclea zeylanica) is a dicot weed in the Sphenocleaceae family.  In Philippines this weed first evolved resistance to Group O/4 herbicides in 1983 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 2,4-D 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 NameGooseweed
SpeciesSphenoclea zeylanica
GroupSynthetic Auxins (O/4)
Herbicides2,4-D
LocationPhilippines
Year1983
Situation(s)Rice
Contributors - (Alphabetically)Juliana S. Manuel 
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NOTES ABOUT THIS BIOTYPE

AREAS FOUND

Juliana S. Manuel
Rice field in Bulacan Rice fields experiment station at UPLB.

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ACADEMIC ASPECTS

Confirmation Tests

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 Group O/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 O/4 resistant Gooseweed from Philippines please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

JULIANA S. MANUEL

Dept. Of Agronomy
de Investigacion y Ensenanza
PO Box 19, CATIE 7170
Laguna, 4031
Philippines

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Philippines have been instrumental in providing you this information. Particular thanks is given to Juliana S. Manuel 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 Synthetic Auxins (O/4)
167Sphenoclea zeylanicaGooseweed131
2 PhilippinesPhilippines 1983 Rice 2,4-D 32 Synthetic Auxins (O/4)
167Sphenoclea zeylanicaGooseweed162
3 ThailandThailand 2000 Rice 2,4-D 47 Synthetic Auxins (O/4)
167Sphenoclea zeylanicaGooseweed5146
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Monday, September 23, 2019 .  Available  www.weedscience.org
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