<b>HRAC Group 1</b> <font size='2'> (Legacy A) </font> resistant Cynosurus echinatus from Chile

INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

HRAC GROUP 1 (LEGACY A) RESISTANT HEDGEHOG DOGTAILGRASS
(Cynosurus echinatus)

Inhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)

Chile, IX región

INTRODUCTION		HEDGEHOG DOGTAILGRASS
Hedgehog Dogtailgrass (Cynosurus echinatus) is a monocot weed in the Poaceae family. In Chile this weed first evolved resistance to Group 1 (Legacy A) herbicides in 1999 and infests Canola, and Wheat. Group 1 (Legacy A) herbicides are known as Inhibition of Acetyl CoA Carboxylase (Inhibition of Acetyl CoA Carboxylase ). Research has shown that these particular biotypes are resistant to clodinafop-propargyl and they may be cross-resistant to other Group 1 (Legacy A) 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 Aug 07, 2012 )
Common Name	Hedgehog Dogtailgrass
Species	Cynosurus echinatus
Group	Inhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)
Herbicides	clodinafop-propargyl
Location	Chile, IX región
Year	1999
Situation(s)	Canola, and Wheat
Contributors - (Alphabetically)	Nelson Espinoza
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Hedgehog Dogtailgrass biotype with this Hedgehog Dogtailgrass 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 1 resistant Hedgehog Dogtailgrass 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 1 (Legacy A) resistant Hedgehog Dogtailgrass from Chile please update the database.

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CONTRIBUTING WEED SCIENTISTS

NELSON ESPINOZA

Investigador Malherbología Inia-Carillanca Producción Vegetal USDA-ARS, 302 Natural Resources Bldg Cropping Systems& Water Quality Temuco Chile Email Nelson Espinoza Web : Web Site Link

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

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Herbicide Resistant Hedgehog Dogtailgrass Globally
(Cynosurus echinatus)

Country

FirstYear

Situation

Active Ingredients

Site of Action

Chile

1999

Canola, and Wheat

clodinafop-propargyl

Inhibition of Acetyl CoA Carboxylase ( HRAC Group 1 (Legacy A)

Chile

2004

Wheat

diclofop-methyl, flucarbazone-Na, halosulfuron-methyl, haloxyfop-methyl, and tepraloxydim

Multiple Resistance: 2 Sites of Action
Inhibition of Acetyl CoA Carboxylase ( HRAC Group 1 (Legacy A)
Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)

Literature about Similar Cases

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Espinoza, N. ; Díaz, J. ; Galdames, R. ; Rodríguez, C. ; Prado, R. de ; Ruiz, E.. 2009. Resistance map to herbicides in sourthern of Chile. : 477 - 480.

In order to determine the magnitude of the herbicide resistance in southern Chile, seeds of Lolium multiflorum, L. rigidum, Avena fatua and Cynosurus echinatus were collected during the period 1998-2007, from wheat commercial field suspected be herbicide-resistant. In bioassays conducted on plants and using either the standard loglogistic regression or a dose of herbicide 50% upper than technical dose, the biotypes were characterized in terms of their response to ACCasa (diclofop, clodinafop, haloxyfop, clethodim tepraloxydim and pinoxaden), ALS (iodosulfuron, iodosulfuron+mesosulfuron and flucarbazone) and glyphosate herbicides. In A. fatua there was resistance only to ACCasa, while in C. echinatus and L. rigidum there was resistance to ACCasa and ALS. In L. multiflorum there was resistance to ACCasa, ALS and glyphosate, however only a small number of biotypes were resistant to the latter herbicide. Mainly, the resistant biotypes of L. multiflorum, A. fatua and C. echinatus, were collected in the Araucanía region, while biotypes of L. rigidum were from the Bío Bío region..

Espinoza N., N. ; Díaz S., J. ; Prado A., R. del. 2005. The history of herbicide-resistant weeds in Chile. : .

Eight biotypes of herbicide-resistant weeds have been described in Chile. All belong to grass weeds, specifically wild oat (Avena fatua), ryegrass (Lolium rigidum), Italian ryegrass (L. multiflorum) and crested dogtailgrass (Cynosurus echinatus), which are the most common in the main wheat, barley, oats, lupin and canola producing area (36°S to 39°S). The biotypes have shown resistance to ACCasa, ALS and EPSP inhibitors. Most biotypes have appeared in farm fields subjected to intensive land use, with annual crops, with a trend to wheat monoculture in some cases, and with intense use of no-till and herbicides with similar mode of action. Herbicides most frequently used have been glyphosate (EPSP), diclofop-methyl and clodinafop-propargyl (ACCasa). Cross-resistance to ACCasa was found in some biotypes of wild oat and ryegrass, with greater resistance to aryloxyphenoxypropionates than to cyclohexanediones. All ACCasaresistant biotypes were susceptible to iodosulfuron and flucarbazone Na (ALS). These two herbicides are recommended for wheat and began to be used just recently in the country. Two biotypes of Italian ryegrass were found resistant to glyphosate. One of these biotypes showed, in addition, resistance to ALS; that is to say, showed multiple resistance. Also the crested dogtailgrass biotype showed multiple resistance to ACCasa and ALS..

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