<b>HRAC Group 2</b> <font size='2'> (Legacy B) </font> resistant Cyperus difformis from Turkey

INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

HRAC GROUP 2 (LEGACY B) RESISTANT SMALLFLOWER UMBRELLA SEDGE
(Cyperus difformis)

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Turkey, Black Sea Trache

INTRODUCTION		SMALLFLOWER UMBRELLA SEDGE
Smallflower Umbrella Sedge (Cyperus difformis) is a monocot weed in the Cyperaceae family. In Turkey this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2010 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 azimsulfuron, bensulfuron-methyl, bispyribac-sodium, and penoxsulam 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 29, 2015 )
Common Name	Smallflower Umbrella Sedge
Species	Cyperus difformis
Group	Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicides	azimsulfuron, bensulfuron-methyl, bispyribac-sodium, and penoxsulam
Location	Turkey, Black Sea Trache
Year	2010
Situation(s)	Rice
Contributors - (Alphabetically)	Emine Kaya Altop, and Hüsrev Mennan
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ACADEMIC ASPECTS

Confirmation Tests

Field, Greenhouse, and Laboratory trials comparing a known susceptible Smallflower Umbrella Sedge biotype with this Smallflower Umbrella Sedge 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 Smallflower Umbrella Sedge indicate that the inheritance is determined by a dominant, nuclear trait. 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 Smallflower Umbrella Sedge from Turkey please update the database.

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CONTRIBUTING WEED SCIENTISTS

EMINE KAYA ALTOP

Weed Scientist Ondokuz Mayis University Department Of Plant Protection Faculty of Agriculture Samsun, 55139, Kurupelit/Samsun Turkey Email Emine Kaya Altop

HÜSREV MENNAN

Prof. Dr. University Of Ondokuzmayýs Department Of Plant Protection Atakum Samsun, 55319, Kurupelit/Samsun Turkey Email Hüsrev Mennan

ACKNOWLEDGEMENTS
The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Turkey have been instrumental in providing you this information. Particular thanks is given to Emine Kaya Altop, and Hüsrev Mennan for providing detailed information.

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Herbicide Resistant Smallflower Umbrella Sedge Globally
(Cyperus difformis)

Country

FirstYear

Situation

Active Ingredients

Site of Action

Australia (New South Wales )

1994

Rice

bensulfuron-methyl