<b>HRAC Group 22</b> <font size='2'> (Legacy D) </font> resistant Youngia japonica from China

INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

HRAC GROUP 22 (LEGACY D) RESISTANT ASIATIC HAWKSBEARD
(Youngia japonica)

PS I Electron Diversion HRAC Group 22 (Legacy D)

China, Sichuan Province

INTRODUCTION		ASIATIC HAWKSBEARD
Asiatic Hawksbeard (Youngia japonica) is a dicot weed in the Asteraceae family. In China this weed first evolved resistance to Group 22 (Legacy D) herbicides in 2009 and infests Unspecified. 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 Jun 10, 2012 )
Common Name	Asiatic Hawksbeard
Species	Youngia japonica
Group	PS I Electron Diversion HRAC Group 22 (Legacy D)
Herbicides	paraquat
Location	China, Sichuan Province
Year	2009
Situation(s)	Unspecified
Contributors - (Alphabetically)	Xuegang Peng
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ACADEMIC ASPECTS

Confirmation Tests

Field trials comparing a known susceptible Asiatic Hawksbeard biotype with this Asiatic Hawksbeard 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 Asiatic Hawksbeard 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 Asiatic Hawksbeard from China please update the database.

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CONTRIBUTING WEED SCIENTISTS

XUEGANG PENG

Research Associate Qingdao kingagroot Ltd. Research institute of maligant weeds Qingdao China Email Xuegang Peng

ACKNOWLEDGEMENTS
The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in China have been instrumental in providing you this information. Particular thanks is given to Xuegang Peng for providing detailed information.

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Herbicide Resistant Asiatic Hawksbeard Globally
(Youngia japonica)

Country

FirstYear

Situation

Active Ingredients

Site of Action

China

2009

Unspecified

paraquat

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

Japan

1986

Chesnut, Mulberry, and Roadsides

diquat, and paraquat

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

Literature about Similar Cases

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Hanioka, Y.. 1989. Paraquat-resistant biotype of Youngia japonica (L.) DC. in mulberry fields in Saitama Prefecture. Weed Research (Tokyo) 34 : 163 - 168.

Leaf discs were taken from Y. japonica plants infesting mulberry fields in Saitama Prefecture and examined for their response to paraquat. leaf discs turned brown within 48 h on exposure to 1 p.p.m. of the herbicide. Discs from resistant biotypes, however, remained green even at concn of 10 p.p.m. This response was similar to that of Erigeron philadelphicus and Conyza canadensis plants resistant to paraquat. Y. japonica biotypes resistant to paraquat occurred on 34% of the mulberry field sites surveyed..

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