<b>HRAC Group 2</b> <font size='2'> (Legacy B) </font> resistant Alisma plantago-aquatica from Spain

International Survey of Herbicide-Resistant Weeds

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HRAC GROUP 2 (LEGACY B) RESISTANT COMMON WATERPLANTAIN
(Alisma plantago-aquatica)

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Spain

INTRODUCTION		COMMON WATERPLANTAIN
Common Waterplantain (Alisma plantago-aquatica) is a monocot weed in the Alismataceae family. In Spain this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2000 and infests Rice. Group 2 (Legacy B) herbicides are known as Inhibition of Acetolactate Synthase (Inhibition of Acetolactate Synthase ). Research has shown that these particular biotypes are resistant to bensulfuron-methyl and they may be cross-resistant to other Group 2 (Legacy B) 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 Jan 16, 2003 )
Common Name	Common Waterplantain
Species	Alisma plantago-aquatica
Group	Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicides	bensulfuron-methyl
Location	Spain
Year	2000
Situation(s)	Rice
Contributors - (Alphabetically)	Jean-Pierre Claude
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ACADEMIC ASPECTS

Confirmation Tests

Field, and Greenhouse trials comparing a known susceptible Common Waterplantain biotype with this Common Waterplantain 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 2 resistant Common Waterplantain 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 2 (Legacy B) resistant Common Waterplantain from Spain please update the database.

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CONTRIBUTING WEED SCIENTISTS

JEAN-PIERRE CLAUDE

Du Pont De Nemours (france) Sa European Research And Development Center 800 N. Lindbergh Blvd. V2A, Nambsheim, F-68740 France Email Jean-Pierre Claude

ACKNOWLEDGEMENTS
The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Spain have been instrumental in providing you this information. Particular thanks is given to Jean-Pierre Claude for providing detailed information.

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Herbicide Resistant Common Waterplantain Globally
(Alisma plantago-aquatica)

Country

FirstYear

Situation

Active Ingredients

Site of Action

Chile

2005

Rice

bensulfuron-methyl