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

PS I Electron Diversion HRAC Group 22 (Legacy D)

China, Sichuan Province

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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  Edit this Case  |  Add New Case of Resistance  |  Add Note

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.   Edit Case  |  Add Note  |  Add Article  |  Add New Case  |  Help

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.

Herbicide Resistant Asiatic Hawksbeard Globally (Youngia japonica) Herbicide Resistant Asiatic Hawksbeard Globally (Youngia japonica) Drag a column header and drop it here to group by that column Herbicide Resistant Asiatic Hawksbeard Globally (Youngia japonica) # Country Country StateName FirstYear Situation Active Ingredients CountryID Site of Action WeedID Species CommonName ResistID 1 China China   2009 Unspecified paraquat 9 PS I Electron Diversion ( HRAC Group 22 (Legacy D) 175 Youngia japonica Asiatic Hawksbeard 5650 2 Japan Japan   1986 Chesnut, Mulberry, and Roadsides diquat, and paraquat 25 PS I Electron Diversion ( HRAC Group 22 (Legacy D) 175 Youngia japonica Asiatic Hawksbeard 124

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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