International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP D/22 RESISTANT ASIATIC HAWKSBEARD
(Youngia japonica)


PSI Electron Diverter (D/22)

Japan, Saitama, Ibaraki
INTRODUCTION ASIATIC HAWKSBEARD
Asiatic Hawksbeard (Youngia japonica) is a dicot weed in the Asteraceae family.  In Japan this weed first evolved resistance to Group D/22 herbicides in 1986 and infests Chesnut, Mulberry, and Roadsides.   Group D/22 herbicides are known as PSI Electron Diverter (Photosystem-I-electron diversion).  Research has shown that these particular biotypes are resistant to diquat, and paraquat and they may be cross-resistant to other Group D/22 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 Dec 29, 2013 )

Common NameAsiatic Hawksbeard
SpeciesYoungia japonica
GroupPSI Electron Diverter (D/22)
Herbicidesdiquat, and paraquat
LocationJapan, Saitama, Ibaraki
Year1986
Situation(s)Chesnut, Mulberry, and Roadsides
Contributors - (Alphabetically)Yasutumi Imai, Kazuyuki Itoh, Satoshi Iwakami, and Akira Uchino 
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NOTES ABOUT THIS BIOTYPE

AREAS FOUND

Yasutumi Imai
Chestnut. Found in orchards and on riverbanks.

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ACADEMIC ASPECTS

Confirmation Tests

Field, Greenhouse, and Laboratory 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 Group D/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 D/22 resistant Asiatic Hawksbeard from Japan please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

YASUTUMI IMAI
Dow Agrosciences Japan
Dow Agrosciences
30500 Doe Circle
Tokyo
Japan
KAZUYUKI ITOH
Professor
Kobe University
Graduate School of Agricultural Science
1-1 Rokkodaicho
Kobe, 657-0013, Hyogo
Japan
Email Kazuyuki Itoh
SATOSHI IWAKAMI
Weed Scientist
University of Tsukuba
Faculty of Life and Environmental Sciences
1-1-1 Tennoudai
Tsukuba, 305-8577, Ibaraki
Japan
Email Satoshi Iwakami
AKIRA UCHINO
Weed Scientist
NARO Agricultural Research Center
Faculty of Life and Environmental Sciences
3-1-1 Kannondai
Tsukuba, 305-8666, Ibaraki
Japan
Email Akira Uchino

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Japan have been instrumental in providing you this information. Particular thanks is given to Yasutumi Imai, Kazuyuki Itoh, Satoshi Iwakami, and Akira Uchino 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)
#CountryFirstYearSituationActive IngredientsSite of Action
1 ChinaChina 2009 Unspecified paraquat 9 PSI Electron Diverter (D/22)
175Youngia japonicaAsiatic Hawksbeard5650
2 JapanJapan 1986 Chesnut, Mulberry, and Roadsides diquat, and paraquat 25 PSI Electron Diverter (D/22)
175Youngia japonicaAsiatic Hawksbeard124
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Tuesday, September 17, 2019 .  Available  www.weedscience.org
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