International Survey of Herbicide-Resistant Weeds

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GROUP B/2 RESISTANT SHORTPOD MUSTARD
(Hirschfeldia incana)


ALS inhibitors (B/2)

Argentina, Coronel Pringles, Buenos Aires SW
INTRODUCTION SHORTPOD MUSTARD
Shortpod Mustard (Hirschfeldia incana) is a dicot weed in the Brassicaceae family.  In Argentina this weed first evolved resistance to Group B/2 herbicides in 2013 and infests Wheat, and Winter barley.   Group B/2 herbicides are known as ALS inhibitors (Inhibition of acetolactate synthase ALS (acetohydroxyacid synthase AHAS)).  Research has shown that these particular biotypes are resistant to metsulfuron-methyl and they may be cross-resistant to other Group B/2 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 Oct 04, 2015 )

Common NameShortpod Mustard
SpeciesHirschfeldia incana
GroupALS inhibitors (B/2)
Herbicidesmetsulfuron-methyl
LocationArgentina, Coronel Pringles, Buenos Aires SW
Year2013
Situation(s)Wheat, and Winter barley
Contributors - (Alphabetically)Mario Raul Vigna 
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NOTES ABOUT THIS BIOTYPE

CONTROL STRATEGIES

Mario Raul Vigna

XXII Congreso de la ALAM

I Congreso de la ASACIM

EVALUACIÓN DE HERBICIDAS CON DIFERENTES MECANISMOS DE ACCIÓN PARA EL CONTROL DE Hirchsfeldia incana L. RESISTENTE A metsulfuron –metil

Mario Raúl Vigna   EEA INTA Bordenave, Ruta 76 km 36.5 8187 Bordenave. vigna.mario@inta.gob.ar

SUMMARY During 2013 season different herbicides were evaluated to control an Hirchsfeldia incana metsulfuron-methyl resistant population in a comercial plot located in Coronel Pringles country (Buenos Aires SW).The objective was to evaluate herbicides with different modes of action regardless of the crop to implant. Two trials were performed: fallowing simulating conditions (15.04.13) and preemergence applications (6.6.13). On 15/4 was evaluated 2,4-D ester 388, diflufenican 100, flumetsulam 96, flumioxazim 57.6, flurochloridone 375, foramsulfuron 36 + iodosulfuron 2.4, imazamox 70, linuron 1500, metribuzin 384, metsulfuron 4.8, sulfometuron 2.3 + chlorimuron 7.5 g , Triasulfuron 7.5 gr i.a.ha -¹ and glyphosate (potassium salt) 810 gr ae. ha -¹ alone and mixed with the above. The weeds were in flowering and seedling emergence started. On 6/6/13 chlorsulfuron 9.4 + metsulfuron-methyl 1.8, diflufenican 100, flumioxazim 57.6, flurochloridone 500, imazamox 70, linuron 1500, metribuzin 384 g i.a.ha -¹ were applied on bare soil. At 40 DAA (days after application) on the first test, the differences were not as obvious as four months later when sulfometuron + chlorimuron, imazamox, foramsulfuron + iodosulfuron, triasulfuron, metsulfuron, flumetsulam and 2,4-D showed very low control and flurochloridone, linuron, flumioxazim and diflufenican were the best. Glyphosate controled the weed. In the second trial flumioxazim, linuron, diflufenican and flurochloridone showed control near to 99% 100 DDA, while imazamox and chlorsulfuron + metsulfuron mixture were approximately 30 and 40% . In this experiences under field conditions the herbicides ALS-inhibitors showed a very low control on H.incana population. Control this weed should be planned using herbicides with other action sites, such as this study case.

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GENERAL

Mario Raul Vigna

XXII Congreso de la ALAM I Congreso de la ASACIM

PRESENCIA DE POBLACIONES DE Hirschfeldia incana (L.) RESISTENTES METSULFURON-METIL EN EL SO DE BUENOS AIRES, ARGENTINA

Mario R. Vigna¹ y Jorge Mendoza².   ¹ EEA INTA Bordenave. Ruta 76 km 36.5 .8187. Bordenave . Correo electrónico: vigna.mario@inta,gob.ar   ² Asesor Privado. 8000 Bahia Blanca Correo electrónico: mendozajor@bbconline.com.ar

Summary: The Brassicaceae species have been a traditional component of the weed community in wheat and barley crops in Buenos Aires SW. Recent years the farmers observed failure of control " turnips " or " beads " with once effective methods . In this frame Hirschfeldia incana (L.) was identified as one of the most persistent species in fields with metsulfuron and glyphosate repeated use on direct drill system history. The aim of this study was to determine the possible resistance to these herbicides in a H. incana population (CF) present in a commercial lot. Herbicides were evaluated in three growth stages under controlled conditions on potted plants grown from seed. Both populations, CF and BO (sensitive or “wild”) showed normal sensitivity to glyphosate. However, doses as high as 256 gr i.a. metsulfuron.Ha¹ were not able to significantly reduce the dry weight/plant of CF, while 2 gr i.a. were sufficient to BO. The growth stage had a minor influence on herbicide response. These results confirm for the first time the presence a Hirschfeldia incana population metsulfuron resistant.

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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Shortpod Mustard biotype with this Shortpod Mustard 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 B/2 resistant Shortpod Mustard 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 B/2 resistant Shortpod Mustard from Argentina please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

MARIO RAUL VIGNA
Investigador
Inta (instituto Nacional De Tecnología Agropecuaria)
Estación Experimental Agropecuaria Bordenave
Ruta Prov. 76 km 36.5
Bordenave, 8187, Buenos Aires
Argentina
Email Mario Raul Vigna
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Argentina have been instrumental in providing you this information. Particular thanks is given to Mario Raul Vigna for providing detailed information.
Herbicide Resistant Shortpod Mustard Globally
(Hirschfeldia incana)
Herbicide Resistant Shortpod Mustard Globally
(Hirschfeldia incana)
Drag a column header and drop it here to group by that column
Herbicide Resistant Shortpod Mustard Globally
(Hirschfeldia incana)
#CountryFirstYearSituationActive IngredientsSite of Action
1 ArgentinaArgentina 2013 Wheat, and Winter barley metsulfuron-methyl 48 ALS inhibitors (B/2)
328Hirschfeldia incanaShortpod Mustard11008
2 ArgentinaArgentina 2016 Wheat 2,4-D, and metsulfuron-methyl 48 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
Synthetic Auxins (O/4)
328Hirschfeldia incanaShortpod Mustard17103
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