International Survey of Herbicide-Resistant Weeds

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HRAC GROUP 2 (LEGACY B) RESISTANT WILD RADISH
(Raphanus raphanistrum)


Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Australia, South Australia
INTRODUCTION WILD RADISH
Wild Radish (Raphanus raphanistrum) is a dicot weed in the Brassicaceae family.  In South Australia this weed first evolved resistance to Group 2 (Legacy B) herbicides in 1998 and infests Spring Barley, and 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 chlorsulfuron, iodosulfuron-methyl-Na, and metosulam 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.

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QUIK STATS (last updated Jan 22, 2014 )

Common NameWild Radish
SpeciesRaphanus raphanistrum
GroupInhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicideschlorsulfuron, iodosulfuron-methyl-Na, and metosulam
LocationAustralia, South Australia
Year1998
Situation(s)Spring Barley, and Wheat
Contributors - (Alphabetically)Abul Hashem, and Christopher Preston 
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ACADEMIC ASPECTS

Confirmation Tests

Field, Greenhouse, and Laboratory trials comparing a known susceptible Wild Radish biotype with this Wild Radish 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 Wild Radish indicate that the inheritance is determined by a one gene, semi dominant trait.  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

Studies on the mechanism of resistance of Group 2 (Legacy B) resistant Wild Radish from South Australia indicate that resistance is due to an altered target site.  There may be a note below or an article discussing the mechanism of resistance in the Fact Sheets and Other Literature
 
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 Wild Radish from South Australia please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

ABUL HASHEM
Senior Research Officer (weed Science)
Agriculture Western Australia
Department Of Agriculture And Food Wa
Hampton Roads Ag Res And Ext Center
1444 Diamond Springs Rd,
Northam, 6401, Western Australia
Australia
Email Abul Hashem
CHRISTOPHER PRESTON
Senior Research Officer (weed Science)
University Of Adelaide - Waite Campus
Crc For Australian Weed Management And School Of Agriculture
Box 2146
Adelaide, 5064, South Australia
Australia
Email Christopher Preston

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in South Australia have been instrumental in providing you this information. Particular thanks is given to Abul Hashem, and Christopher Preston for providing detailed information.
Herbicide Resistant Wild Radish Globally
(Raphanus raphanistrum)
Herbicide Resistant Wild Radish Globally
(Raphanus raphanistrum)
Drag a column header and drop it here to group by that column
Herbicide Resistant Wild Radish Globally
(Raphanus raphanistrum)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Australia (Western Australia) AustraliaWestern Australia1997 Cereals, and Wheat chlorsulfuron, and metosulam 1 Inhibition of Acetolactate Synthase (B/2)
141Raphanus raphanistrumWild Radish522
2 Australia (Western Australia) AustraliaWestern Australia1998 Cropland chlorsulfuron, diflufenican, and metosulam 1 Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase (B/2)
Phytoene Desaturase inhibitors (F1/12)
141Raphanus raphanistrumWild Radish5033
3 Australia (South Australia) AustraliaSouth Australia1998 Spring Barley, and Wheat chlorsulfuron, iodosulfuron-methyl-Na, and metosulam 1 Inhibition of Acetolactate Synthase (B/2)
141Raphanus raphanistrumWild Radish5034
4 Australia (Western Australia) AustraliaWestern Australia1999 Lupins, and Triazine-tolerant canola atrazine, and simazine 1 PSII inhibitors - Serine 264 Binders (C1 C2/5)
141Raphanus raphanistrumWild Radish1135
5 Australia (Western Australia) AustraliaWestern Australia1999 Cereals 2,4-D 1 Auxin Mimics (O/4)
141Raphanus raphanistrumWild Radish5358
6 Australia (New South Wales ) AustraliaNew South Wales 2004 Cereals chlorsulfuron, metsulfuron-methyl, and triasulfuron 1 Inhibition of Acetolactate Synthase (B/2)
141Raphanus raphanistrumWild Radish5338
7 Australia (South Australia) AustraliaSouth Australia2006 Cereals 2,4-D, diflufenican, MCPA, and triasulfuron 1 Multiple Resistance: 3 Sites of Action
Inhibition of Acetolactate Synthase (B/2)
Phytoene Desaturase inhibitors (F1/12)
Auxin Mimics (O/4)
141Raphanus raphanistrumWild Radish5364
8 Australia (Victoria) AustraliaVictoria2009 Spring Barley, and Wheat 2,4-D, chlorsulfuron, and metosulam 1 Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase (B/2)
Auxin Mimics (O/4)
141Raphanus raphanistrumWild Radish7845
9 Australia (Western Australia) AustraliaWestern Australia2010 Fallow 2,4-D, chlorsulfuron, diflufenican, glyphosate, imazethapyr, MCPA, metosulam, and sulfometuron-methyl 1 Multiple Resistance: 4 Sites of Action
Inhibition of Acetolactate Synthase (B/2)
Phytoene Desaturase inhibitors (F1/12)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
Auxin Mimics (O/4)
141Raphanus raphanistrumWild Radish7888
10 Australia (Victoria) AustraliaVictoria2011 Spring Barley, and Wheat 2,4-D 1 Auxin Mimics (O/4)
141Raphanus raphanistrumWild Radish7846
11 Australia (New South Wales ) AustraliaNew South Wales 2013 Oats, Spring Barley, and Wheat 2,4-D 1 Auxin Mimics (O/4)
141Raphanus raphanistrumWild Radish7839
12 Australia (Western Australia) AustraliaWestern Australia2015 Wheat 2,4-D, atrazine, chlorsulfuron, diflufenican, fluridone, isoxaflutole, mesotrione, and tembotrione 1 Multiple Resistance: 5 Sites of Action
Inhibition of Acetolactate Synthase (B/2)
PSII inhibitors - Serine 264 Binders (C1 C2/5)
Phytoene Desaturase inhibitors (F1/12)
Inhibition of Hydroxyphenyl Pyruvate Dioxygenase (F2/27)
Auxin Mimics (O/4)
141Raphanus raphanistrumWild Radish19223
13 Australia (Western Australia) AustraliaWestern Australia2020 Wheat 2,4-D, dicamba, mesotrione, metsulfuron-methyl, pyroxasulfone, and topramezone 1 Multiple Resistance: 4 Sites of Action
Inhibition of Acetolactate Synthase (B/2)
Inhibition of Hydroxyphenyl Pyruvate Dioxygenase (F2/27)
Very Long-Chain Fatty Acid Synthesis inhibitors (K3 N/15)
Auxin Mimics (O/4)
141Raphanus raphanistrumWild Radish19219
14 BrazilBrazil 2013 Spring Barley, and Wheat chlorimuron-ethyl, cloransulam-methyl, imazapic, imazapyr, iodosulfuron-methyl-Na, metsulfuron-methyl, and sulfometuron-methyl 5 Inhibition of Acetolactate Synthase (B/2)
141Raphanus raphanistrumWild Radish7895
15 South AfricaSouth Africa 1997 Spring Barley, and Wheat chlorsulfuron, iodosulfuron-methyl-Na, metsulfuron-methyl, thifensulfuron-methyl, triasulfuron, and tribenuron-methyl 37 Inhibition of Acetolactate Synthase (B/2)
141Raphanus raphanistrumWild Radish5197
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