International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP B/2 RESISTANT COMMON FALSE-PIMPERNEL; AZENA (JAPANESE)
(Lindernia procumbens)


ALS inhibitors (B/2)

Japan, Yamagata
INTRODUCTION COMMON FALSE-PIMPERNEL; AZENA (JAPANESE)
Common False-pimpernel; Azena (Japanese) (Lindernia procumbens) is a dicot weed in the Scrophulariaceae family.  In Japan this weed first evolved resistance to Group B/2 herbicides in 1996 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 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 Dec 28, 2013 )

Common NameCommon False-pimpernel; Azena (Japanese)
SpeciesLindernia procumbens
GroupALS inhibitors (B/2)
Herbicidesbensulfuron-methyl
LocationJapan, Yamagata
Year1996
Situation(s)Rice
Contributors - (Alphabetically)Kazuyuki Itoh 
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NOTES ABOUT THIS BIOTYPE

GENERAL

Kazuyuki Itoh
Named Azena in Japanese.

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GENERAL

Kazuyuki Itoh
Itoh 1997, Uchino et al. 1997.

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ACADEMIC ASPECTS

Confirmation Tests

Field, and Greenhouse trials comparing a known susceptible Common False-pimpernel; Azena (Japanese) biotype with this Common False-pimpernel; Azena (Japanese) 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 Common False-pimpernel; Azena (Japanese) 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 B/2 resistant Common False-pimpernel; Azena (Japanese) from Japan please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

KAZUYUKI ITOH
Professor
Kobe University
Graduate School of Agricultural Science
1-1 Rokkodaicho
Kobe, 657-0013, Hyogo
Japan
Email Kazuyuki Itoh

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 Kazuyuki Itoh for providing detailed information.
Herbicide Resistant Common False-pimpernel; Azena (Japanese) Globally
(Lindernia procumbens)
Herbicide Resistant Common False-pimpernel; Azena (Japanese) Globally
(Lindernia procumbens)
Drag a column header and drop it here to group by that column
Herbicide Resistant Common False-pimpernel; Azena (Japanese) Globally
(Lindernia procumbens)
#CountryFirstYearSituationActive IngredientsSite of Action
1 JapanJapan 1996 Rice bensulfuron-methyl 25 ALS inhibitors (B/2)
109Lindernia procumbensCommon False-pimpernel; Azena (Japanese)537
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