International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
MULTIPLE RESISTANT STERILE OAT
(Avena sterilis)


Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)

Italy
INTRODUCTION STERILE OAT
Sterile Oat (Avena sterilis) is a monocot weed in the Poaceae family.  In Italy this weed first evolved multiple resistance (to 2 herbicide sites of action) in 2004 and infests Durum wheat.  Multiple resistance has evolved to herbicides in the Groups A/1, and B/2.  These particular biotypes are known to have resistance to clodinafop-propargyl, cycloxydim, iodosulfuron-methyl-sodium, mesosulfuron-methyl, and pinoxaden and they may be cross-resistant to other herbicides in the Groups A/1, and B/2.

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 07, 2012 )

Common NameSterile Oat
SpeciesAvena sterilis
GroupACCase inhibitors (A/1)
ALS inhibitors (B/2)
Herbicidesclodinafop-propargyl, cycloxydim, iodosulfuron-methyl-sodium, mesosulfuron-methyl, and pinoxaden
LocationItaly
Year2004
Situation(s)Durum wheat
Contributors - (Alphabetically)Alberto Collavo 
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NOTES ABOUT THIS BIOTYPE

AREAS FOUND

Alberto Collavo
Central and southern Italy, expecially in Apulia, Basilicata and Lazio.

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CONTROL STRATEGIES

Alberto Collavo
Integrated weed management by combining the delay of sowing time and herbicide treatements.

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CROSS RESISTANCE

Alberto Collavo
Most of the multiple-resistant populations show resistance to clodinafop and Atlantis WG, while three populations are resistant to the ALS tested, clodinafop, pinoxaden, cycloxydim.

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FIELD HISTORIES

Alberto Collavo
Field histories highlight that where resistance developed, fields had had at least 5 treatments with ACCase inhibitors. Often, but not always, the cropping system was a wheat monoculture. However, where rotation was adopted, the other crops (i.e. autumn sown sugarbeet, clover) were often treated with an ACCase inhibitor. Until the mid-nineties diclofop was the usual selecting agent while later, fenoxaprop and especially clodinafop were often used.

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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 Group A, B/1, 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 multiple resistant Sterile Oat from Italy please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

ALBERTO COLLAVO
Post Doc
National Council for Research (CNR)
Institute Of Agro-Environmental And Forest Biology (IBAF)
Viale dell'Univeristà 16
Legnaro, 35020, Padova
Italy
Email Alberto Collavo
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Italy have been instrumental in providing you this information. Particular thanks is given to Alberto Collavo for providing detailed information.
Herbicide Resistant Sterile Oat Globally
(Avena sterilis)
Herbicide Resistant Sterile Oat Globally
(Avena sterilis)
Drag a column header and drop it here to group by that column
Herbicide Resistant Sterile Oat Globally
(Avena sterilis)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Australia (South Australia) AustraliaSouth Australia1989 Canola, Chickpea, Clover, Faba beans, Lentils, Lupins, Peas, and Wheat diclofop-methyl, fluazifop-P-butyl, and sethoxydim 1 ACCase inhibitors (A/1)
29Avena sterilisSterile Oat21
2 Australia (New South Wales ) AustraliaNew South Wales 1989 Canola, Chickpea, and Wheat diclofop-methyl, fluazifop-P-butyl, and sethoxydim 1 ACCase inhibitors (A/1)
29Avena sterilisSterile Oat5029
3 CyprusCyprus 2010 Spring Barley diclofop-methyl 53 ACCase inhibitors (A/1)
29Avena sterilisSterile Oat5643
4 FranceFrance 2006 Wheat iodosulfuron-methyl-sodium, mesosulfuron-methyl, metsulfuron-methyl, and pyroxsulam 17 ALS inhibitors (B/2)
29Avena sterilisSterile Oat9937
5 GreeceGreece 2009 Wheat clodinafop-propargyl, diclofop-methyl, fenoxaprop-P-ethyl, pinoxaden, and tralkoxydim 19 ACCase inhibitors (A/1)
29Avena sterilisSterile Oat6740
6 IranIran 2008 Wheat pinoxaden 79 ACCase inhibitors (A/1)
29Avena sterilisSterile Oat5378
7 IranIran 2009 Wheat iodosulfuron-methyl-sodium, and mesosulfuron-methyl 79 ALS inhibitors (B/2)
29Avena sterilisSterile Oat5376
8 IsraelIsrael 2006 Wheat clodinafop-propargyl, cycloxydim, and fenoxaprop-P-ethyl 23 ACCase inhibitors (A/1)
29Avena sterilisSterile Oat5300
9 ItalyItaly 1992 Wheat clodinafop-propargyl, cycloxydim, diclofop-methyl, pinoxaden, sethoxydim, and tralkoxydim 24 ACCase inhibitors (A/1)
29Avena sterilisSterile Oat1128
10 ItalyItaly 2004 Durum wheat clodinafop-propargyl, cycloxydim, iodosulfuron-methyl-sodium, mesosulfuron-methyl, and pinoxaden 24 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
29Avena sterilisSterile Oat5632
11 ItalyItaly 2007 Durum wheat iodosulfuron-methyl-sodium, and mesosulfuron-methyl 24 ALS inhibitors (B/2)
29Avena sterilisSterile Oat8908
12 TurkeyTurkey 1997 Wheat clodinafop-propargyl, diclofop-methyl, fenoxaprop-P-ethyl, and tralkoxydim 71 ACCase inhibitors (A/1)
29Avena sterilisSterile Oat5101
13 TurkeyTurkey 2008 clodinafop-propargyl, and pyroxsulam 71 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
29Avena sterilisSterile Oat5402
14 United KingdomUnited Kingdom 1993 Cereals, and Wheat fenoxaprop-P-ethyl, flamprop-methyl, fluazifop-P-butyl, imazamethabenz-methyl, iodosulfuron-methyl-sodium, mesosulfuron-methyl, and tralkoxydim 44 Multiple Resistance: 3 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
Antimicrotubule mitotic disrupter (Z/25)
29Avena sterilisSterile Oat354
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