INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

HRAC GROUP 9 (LEGACY G) RESISTANT PRICKLY LETTUCE
(Lactuca serriola)


Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)

Australia, Victoria
INTRODUCTION BLACKGRASS
Blackgrass (Alopecurus myosuroides) is a monocot weed in the Poaceae family.  In Belgium this weed first evolved multiple resistance (to 4 herbicide sites of action) in 1996 and infests Fallow.  Multiple resistance has evolved to herbicides in the Groups 1 (Legacy A), Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B), PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2), and Inhibition of Microtubule Assembly 2 HRAC Group 3 (Legacy K1).  These particular biotypes are known to have resistance to glyphosate and they may be cross-resistant to other herbicides in the Groups 1 (Legacy A), Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B), PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2), and Inhibition of Microtubule Assembly 2 HRAC Group 3 (Legacy K1).

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 Nov 21, 2000 )

Common NameBlackgrass
SpeciesAlopecurus myosuroides
GroupInhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)

Inhibition of Microtubule Assembly 2 HRAC Group 3 (Legacy K1)
Herbicidesglyphosate
LocationBelgium
Year1996
Situation(s)Fallow
Contributors - (Alphabetically)Christopher Preston 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse, and Laboratory trials comparing a known susceptible Blackgrass biotype with this Blackgrass 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, 2, 5, 3 resistant Blackgrass 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 multiple resistant Blackgrass from Belgium please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

CHRISTOPHER PRESTON
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 Belgium have been instrumental in providing you this information. Particular thanks is given to Christopher Preston for providing detailed information.
Herbicide Resistant Prickly Lettuce Globally
(Lactuca serriola)
Herbicide Resistant Prickly Lettuce Globally
(Lactuca serriola)
Drag a column header and drop it here to group by that column
Herbicide Resistant Prickly Lettuce Globally
(Lactuca serriola)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Australia (South Australia) AustraliaSouth Australia1994 Canola, Roadsides, Spring Barley, and Wheat chlorsulfuron, flumetsulam, metosulam, metsulfuron-methyl, and triasulfuron 1 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
102Lactuca serriolaPrickly Lettuce26
2 Australia (Victoria) AustraliaVictoria2009 Spring Barley, and Wheat chlorsulfuron, and metsulfuron-methyl 1 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
102Lactuca serriolaPrickly Lettuce5516
3 Australia (Victoria) AustraliaVictoria2015 Fallow glyphosate 1 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
102Lactuca serriolaPrickly Lettuce11022
4 United States (Idaho) United StatesIdaho1987 Canola, Cereals, Chickpea, Lentils, Peas, and Wheat chlorsulfuron, imazethapyr, metsulfuron-methyl, thifensulfuron-methyl, triasulfuron, and tribenuron-methyl 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
102Lactuca serriolaPrickly Lettuce230
5 United States (Washington) United StatesWashington1993 Cereals, and Wheat chlorsulfuron 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
102Lactuca serriolaPrickly Lettuce518
6 United States (Oregon) United StatesOregon1993 Wheat chlorsulfuron, metsulfuron-methyl, and triasulfuron 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
102Lactuca serriolaPrickly Lettuce1174
7 United States (Washington) United StatesWashington2007 Cereals 2,4-D, dicamba, and MCPA 45 Auxin Mimics ( HRAC Group 4 (Legacy O)
102Lactuca serriolaPrickly Lettuce5328
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