International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
HRAC GROUP 2 (LEGACY B) RESISTANT STERILE OAT
(Avena sterilis ssp. ludoviciana)


Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Australia, South Australia
INTRODUCTION STERILE OAT
Sterile oat (Avena sterilis ssp. ludoviciana) is a monocot weed in the Poaceae family.  In South Australia this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2005 and infests Wheat.   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 iodosulfuron-methyl-Na 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.

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QUIK STATS (last updated Aug 10, 2005 )

Common NameSterile oat
SpeciesAvena sterilis ssp. ludoviciana
GroupInhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicidesiodosulfuron-methyl-Na
LocationAustralia, South Australia
Year2005
Situation(s)Wheat
Contributors - (Alphabetically)Peter Boutsalis, and Christopher Preston 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Sterile oat biotype with this Sterile oat 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 Sterile oat 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 Sterile oat from South Australia please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

PETER BOUTSALIS
Postdoctural Fellow/ Consultant
University Of Adelaide / Plant Science Consulting
Plant And Pest Science
800 N Lindbergh Blvd
02G
Adelaide, 5064, South Australia
Australia
Email Peter Boutsalis
CHRISTOPHER PRESTON
Postdoctural Fellow/ Consultant
University Of Adelaide - Waite Campus
Crc For Australian Weed Management And School Of Agriculture
Box 2146
Adelaide, 5064, South Australia
Australia
Email Christopher Preston

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in South Australia have been instrumental in providing you this information. Particular thanks is given to Peter Boutsalis, and Christopher Preston for providing detailed information.
Herbicide Resistant Sterile oat Globally
(Avena sterilis ssp. ludoviciana)
Herbicide Resistant Sterile oat Globally
(Avena sterilis ssp. ludoviciana)
Drag a column header and drop it here to group by that column
Herbicide Resistant Sterile oat Globally
(Avena sterilis ssp. ludoviciana)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Australia (New South Wales ) AustraliaNew South Wales 2002 Wheat flamprop-methyl 1 Antimicrotubule mitotic disrupter (Z/25)
30Avena sterilis ssp. ludovicianaSterile oat5198
2 Australia (South Australia) AustraliaSouth Australia2005 Wheat iodosulfuron-methyl-Na 1 Inhibition of Acetolactate Synthase (B/2)
30Avena sterilis ssp. ludovicianaSterile oat5252
3 Australia (Queensland) AustraliaQueensland2006 Chickpea, Spring Barley, and Wheat clodinafop-propargyl, and diclofop-methyl 1 Inhibition of Acetyl CoA Carboxylase (A/1)
30Avena sterilis ssp. ludovicianaSterile oat10967
4 Australia (New South Wales ) AustraliaNew South Wales 2018 Chickpea glyphosate 1 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
30Avena sterilis ssp. ludovicianaSterile oat18186
5 FranceFrance 1996 Wheat fenoxaprop-ethyl 17 Inhibition of Acetyl CoA Carboxylase (A/1)
30Avena sterilis ssp. ludovicianaSterile oat547
6 IranIran 2006 Canola, and Winter wheat clodinafop-propargyl, diclofop-methyl, fenoxaprop-ethyl, haloxyfop-methyl, pinoxaden, sethoxydim, and tralkoxydim 79 Inhibition of Acetyl CoA Carboxylase (A/1)
30Avena sterilis ssp. ludovicianaSterile oat5339
7 IranIran 2009 Wheat iodosulfuron-methyl-Na, and mesosulfuron-methyl 79 Inhibition of Acetolactate Synthase (B/2)
30Avena sterilis ssp. ludovicianaSterile oat10985
8 IranIran 2010 Winter wheat clodinafop-propargyl, iodosulfuron-methyl-Na, and mesosulfuron-methyl 79 Multiple Resistance: 2 Sites of Action
Inhibition of Acetyl CoA Carboxylase (A/1)
Inhibition of Acetolactate Synthase (B/2)
30Avena sterilis ssp. ludovicianaSterile oat5541
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