<b>HRAC Group 2</b> <font size='2'> (Legacy B) </font> resistant Anthemis arvensis from Chile

INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

HRAC GROUP 2 (LEGACY B) RESISTANT CORN CHAMOMILE
(Anthemis arvensis)

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Chile, La Araucanía

INTRODUCTION		CORN CHAMOMILE
Corn Chamomile (Anthemis arvensis) is a dicot weed in the Asteraceae family. In Chile this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2010 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, mesosulfuron-methyl, and pyroxsulam 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 Dec 30, 2013 )
Common Name	Corn Chamomile
Species	Anthemis arvensis
Group	Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicides	iodosulfuron-methyl-Na, mesosulfuron-methyl, and pyroxsulam
Location	Chile, La Araucanía
Year	2010
Situation(s)	Wheat
Contributors - (Alphabetically)	Nelson Espinoza, and Cristian Rodriguez
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ACADEMIC ASPECTS

Confirmation Tests

Field, and Greenhouse trials comparing a known susceptible Corn Chamomile biotype with this Corn Chamomile 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 Corn Chamomile 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 Corn Chamomile 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

CRISTIAN RODRIGUEZ

Agronomist Inia-Carillanca Producción Vegetal USDA-ARS, 302 Natural Resources Bldg Cropping Systems& Water Quality Temuco Chile Email Cristian Rodriguez 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, and Cristian Rodriguez for providing detailed information.

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Herbicide Resistant Corn Chamomile Globally
(Anthemis arvensis)

Country

FirstYear

Situation

Active Ingredients

Site of Action

Chile

2010

Wheat

iodosulfuron-methyl-Na, mesosulfuron-methyl, and pyroxsulam

Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)

Literature about Similar Cases

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Badowski, M. ; Kucharski, M.. 2005. Chemical weed control in white mustard (Sinapis alba) crop. Rośliny Oleiste 26 : 193 - 198.

Field experiments were conducted in Poland, from 2002 to 2004, to evaluate the efficacy of selected herbicides used to control weeds in white mustard. The herbicides Galera 334 SL (67 g picloram + 267 g clopyralid/litre) and Lontrel 300 SL (300 g clopyralid/litre) at 0.35 litre/ha, Butisan 400 SC (400 g metazachlor/litre) at 3 litre/ha and a mixture of Butisan 400 SC + Galera 334 SL at 2 + 0.35 litre/ha, were applied to control Chenopodium album, Viola arvensis, Anthemis arvensis, Geranium pusillum, Thlaspi arvense and Stellaria media were during the spring, at the 2-4 leaf stage of white mustard. The phytotoxicity, efficacy of weed control and yield of white mustard were evaluated. Lontrel 300 SL and Butisan 400 SC were selected for mustard. Galera 334 SL caused some phytotoxic effect, which was temporary and did not influence yield. Galera 334 SL effectively controlled A. arvensis and T. arvense. C. album, V. arvensis and S. media were semi-sensitive and G. pusillum was resistant. Lontrel 300 SL eliminated only A. arvensis. Butisan 400 SC controlled the majority of the weed species. Only G. pusillum was weakly eliminated. The best efficacy of weed control and the highest yield of white mustard seeds were obtained from plants where the Butisan 400 SC + Galera 334 SL mixture was applied..

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