International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
HRAC GROUP 22 (LEGACY D) RESISTANT TARWEED CUPHEA
(Cuphea carthagenensis)

PS I Electron Diversion HRAC Group 22 (Legacy D)

Fiji
INTRODUCTION TARWEED CUPHEA
Tarweed Cuphea (Cuphea carthagenensis) is a dicot weed in the Lythraceae family.  In Fiji this weed first evolved resistance to Group 22 (Legacy D) herbicides in 1984 and infests Taro.   Group 22 (Legacy D) herbicides are known as PS I Electron Diversion (PSI Electron Diversion ).  Research has shown that these particular biotypes are resistant to paraquat and they may be cross-resistant to other Group 22 (Legacy D) 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 NameTarweed Cuphea
SpeciesCuphea carthagenensis
GroupPS I Electron Diversion HRAC Group 22 (Legacy D)
Herbicidesparaquat
LocationFiji
Year1984
Situation(s)Taro
Contributors - (Alphabetically)Mereseini Nagatalevu 
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NOTES ABOUT THIS BIOTYPE

AREAS FOUND

Mereseini Nagatalevu
The cultivated areas in the wet zone of the islands (Viti Levu + Vanualevu)

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GENERAL

Mereseini Nagatalevu
Tarweed whose origin is Tropical America has been around for a long time. It evolved resistance to paraquat which is recommended as a direct spray between rows in root crops eg: Taro.

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ACADEMIC ASPECTS

Confirmation Tests

Field trials comparing a known susceptible Tarweed Cuphea biotype with this Tarweed Cuphea 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 22 resistant Tarweed Cuphea 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 22 (Legacy D) resistant Tarweed Cuphea from Fiji please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

MERESEINI NAGATALEVU
Weed Control Research Officer
Misnistry Of Primary Industries
Research Division
343 Rumford Rd
Nausori
Fiji

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Fiji have been instrumental in providing you this information. Particular thanks is given to Mereseini Nagatalevu for providing detailed information.
Herbicide Resistant Tarweed Cuphea Globally
(Cuphea carthagenensis)
Herbicide Resistant Tarweed Cuphea Globally
(Cuphea carthagenensis)
Drag a column header and drop it here to group by that column
Herbicide Resistant Tarweed Cuphea Globally
(Cuphea carthagenensis)
#CountryFirstYearSituationActive IngredientsSite of Action
1 FijiFiji 1984 Taro paraquat 16 PS I Electron Diversion ( HRAC Group 22 (Legacy D)
 		68Cuphea carthagenensisTarweed Cuphea148
Literature about Similar Cases

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