<b>HRAC Group 22</b> <font size='2'> (Legacy D) </font> resistant Cuphea carthagenensis from Fiji

INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

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.

QUIK STATS (last updated Sep 15, 2000 )
Common Name	Tarweed Cuphea
Species	Cuphea carthagenensis
Group	PS I Electron Diversion HRAC Group 22 (Legacy D)
Herbicides	paraquat
Location	Fiji
Year	1984
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.

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Herbicide Resistant Tarweed Cuphea Globally
(Cuphea carthagenensis)

Country

FirstYear

Situation

Active Ingredients

Site of Action

Fiji

1984

Taro

paraquat

PS I Electron Diversion ( HRAC Group 22 (Legacy D)

Literature about Similar Cases

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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, October 31, 2024 . Available www.weedscience.org Copyright © 1993- 2024 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.