<b>HRAC Group 2</b> <font size='2'> (Legacy B) </font> resistant Rumex dentatus from India

INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

HRAC GROUP 2 (LEGACY B) RESISTANT TOOTHED DOCK
(Rumex dentatus)

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

India

INTRODUCTION		TOOTHED DOCK
Toothed Dock (Rumex dentatus) is a dicot weed in the Polygonaceae family. In India this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2014 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 florasulam, 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 Jan 20, 2015 )
Common Name	Toothed Dock
Species	Rumex dentatus
Group	Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicides	florasulam, iodosulfuron-methyl-Na, mesosulfuron-methyl, and pyroxsulam
Location	India
Year	2014
Situation(s)	Wheat
Contributors - (Alphabetically)	Rajender Chhokar
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NOTES ABOUT THIS BIOTYPE

GENERAL

Rajender Chhokar

Metsulfuron resistance in Rumex dentatus

Rumex dentatus (Toothed dock) is a major broadleaf weed of Rabi season and is a serious problem of irrigated wheat particularly of rice-wheat system. This weed is highly competitive and besides reducing the yield also interferes with combine harvesting. Rumex dentatus is highly sensitive to metsulfuron and this herbicide is providing effective control of this weed for the last 15 years in wheat in India. However, during 2013 in pot and field studies it was observed that one of the population of Rumex dentatus has evolved metsulfuron resistance (ALS inhibition). It has shown the cross-resistance to mesosulfuron + Iodosulfuron, pyroxsulam, halauxifen + florasulam. For its control, carfentrazone, 2,4-D amine, pendimethalin and isoproturon were found effective.

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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse, and Laboratory trials comparing a known susceptible Toothed Dock biotype with this Toothed Dock 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 Toothed Dock 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 Toothed Dock from India please update the database.

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CONTRIBUTING WEED SCIENTISTS

RAJENDER CHHOKAR

Senior Scientist Directorate of Wheat Research Resource Management Programme Aggarsain Marg Karnal, 132001, Haryana India Email Rajender Chhokar

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

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Herbicide Resistant Toothed Dock Globally
(Rumex dentatus)

Country

FirstYear

Situation

Active Ingredients

Site of Action

India

2014

Wheat

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

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

Literature about Similar Cases

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Montazeri, M. ; Zand, E. ; Poor-Azar, R. ; Barjasteh, A. R. ; Nooroz-Zadeh, S. ; Vaici, M.. 2005. An evaluation of the efficacy of four wheat selective herbicides in the control of annual dicotyledonous weeds. Iranian Journal of Weed Science 1 : 155 - 162.

The efficacy of 2,4-D, 2,4-D + MCPA, bromoxynil and tribenuron-methyl [tribenuron] (at 1.08, 0.56 + 0.47, 0.56 and 15.0 g/ha, respectively) for the control of 17 annual broadleaf weed species was evaluated during 2002 and 2003 in 5 Iranian provinces: Tehran, Khuzestan, Semnan, Kermanshah and Khorasan. The herbicides were applied when the target weeds were at the 2- to 4-leaf stage. Most of the weed species were significantly controlled by at least one of the herbicides. However, Rumex crispus, Rumex dentatus, Fumaria officinalis and Polygonum aviculare were relatively tolerant of all the herbicides. Among the weed species, Sinapis arvensis, Rapistrum rugosum and Beta maritima were controlled completely by all the herbicides. For the control of Centaurea depressa, Chenopodium album, Cephalaria syriaca, Carthamus oxyacantha and Sisymbrium officinale, 2,4-D and 2,4-D + MCPA were significantly more effective than tribenuron-methyl or bromoxynil. For the control of Goldbachia laevigata, bromoxynil was more effective than the other herbicides. Stellaria media was more sensitive to tribenuron-methyl than to the other herbicides..

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