International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP B/2 RESISTANT THREELEAF ARROWHEAD
(Sagittaria trifolia)


ALS inhibitors (B/2)

China, Northeastern China
INTRODUCTION THREELEAF ARROWHEAD
Threeleaf Arrowhead (Sagittaria trifolia) is a monocot weed in the Alismataceae family.  In China this weed first evolved resistance to Group B/2 herbicides in 2014 and infests Rice.   Group B/2 herbicides are known as ALS inhibitors (Inhibition of acetolactate synthase ALS (acetohydroxyacid synthase AHAS)).  Research has shown that these particular biotypes are resistant to bensulfuron-methyl, bispyribac-sodium, penoxsulam, and pyribenzoxim and they may be cross-resistant to other Group B/2 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 May 01, 2018 )

Common NameThreeleaf Arrowhead
SpeciesSagittaria trifolia
GroupALS inhibitors (B/2)
Herbicidesbensulfuron-methyl, bispyribac-sodium, penoxsulam, and pyribenzoxim
LocationChina, Northeastern China
Year2014
Situation(s)Rice
Contributors - (Alphabetically)Mingshan Ji 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse, and Laboratory trials comparing a known susceptible Threeleaf Arrowhead biotype with this Threeleaf Arrowhead 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 B/2 resistant Threeleaf Arrowhead 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

Studies on the mechanism of resistance of Group B/2 resistant Threeleaf Arrowhead from China indicate that resistance is due to an altered target site.  There may be a note below or an article discussing the mechanism of resistance in the Fact Sheets and Other Literature
 
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 B/2 resistant Threeleaf Arrowhead from China please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

MINGSHAN JI
Associate Professer
Shenyang Agriculture University
Plant Protection
Argicultural Research and Extension Center
121 Northville Rd,
Shenyang, 110161, Liaoning Province
China
Email Mingshan Ji

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 Mingshan Ji for providing detailed information.
Herbicide Resistant Threeleaf Arrowhead Globally
(Sagittaria trifolia)
Herbicide Resistant Threeleaf Arrowhead Globally
(Sagittaria trifolia)
Drag a column header and drop it here to group by that column
Herbicide Resistant Threeleaf Arrowhead Globally
(Sagittaria trifolia)
#CountryFirstYearSituationActive IngredientsSite of Action
1 ChinaChina 2014 Rice bensulfuron-methyl, bispyribac-sodium, penoxsulam, and pyribenzoxim 9 ALS inhibitors (B/2)
294Sagittaria trifoliaThreeleaf Arrowhead17139
2 JapanJapan 1997 Rice bensulfuron-methyl 25 ALS inhibitors (B/2)
294Sagittaria trifoliaThreeleaf Arrowhead7765
3 South KoreaSouth Korea 2011 Rice azimsulfuron, bensulfuron-methyl, cinosulfuron, ethoxysulfuron, halosulfuron-methyl, imazosulfuron, and pyrazosulfuron-ethyl 27 ALS inhibitors (B/2)
294Sagittaria trifoliaThreeleaf Arrowhead7851
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Monday, September 16, 2019 .  Available  www.weedscience.org
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