<b>HRAC Group 2</b> <font size='2'> (Legacy B) </font> resistant Helianthus annuus from France

International Survey of Herbicide-Resistant Weeds

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Thursday, November 14, 2024

HRAC GROUP 2 (LEGACY B) RESISTANT COMMON SUNFLOWER
(Helianthus annuus)

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

France

INTRODUCTION		COMMON SUNFLOWER
Common Sunflower (Helianthus annuus) is a dicot weed in the Asteraceae family. In France this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2009 and infests Sunflower. 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 imazamox, and tribenuron-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 Nov 25, 2014 )
Common Name	Common Sunflower
Species	Helianthus annuus
Group	Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicides	imazamox, and tribenuron-methyl
Location	France
Year	2009
Situation(s)	Sunflower
Contributors - (Alphabetically)	Christophe Délye
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse, and Laboratory trials comparing a known susceptible Common Sunflower biotype with this Common Sunflower 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 Sunflower 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 Sunflower from France please update the database.

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CONTRIBUTING WEED SCIENTISTS

CHRISTOPHE DÉLYE

Chargé de Recherches INRA Agroécologie 17 rue de Sully Dijon, F-21000, Burgundy France Email Christophe Délye Web : Web Site Link

ACKNOWLEDGEMENTS
The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in France have been instrumental in providing you this information. Particular thanks is given to Christophe Délye for providing detailed information.

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Herbicide Resistant Common Sunflower Globally
(Helianthus annuus)

Country

FirstYear

Situation

Active Ingredients

Site of Action

France

2009

Sunflower

imazamox, and tribenuron-methyl