International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
HRAC GROUP 2 (LEGACY B) RESISTANT SPINY SOWTHISTLE
(Sonchus asper)


Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Norway
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 Spring Barley, and Spring wheat.  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 iodosulfuron-methyl-Na, and tribenuron-methyl 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.

If we do not have a picture for this weed, or you can provide a better picture (scan, digital camera etc) please please e-mail it to us.

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)
Herbicidesiodosulfuron-methyl-Na, and tribenuron-methyl
LocationBelgium
Year1996
Situation(s)Spring Barley, and Spring wheat
Contributors - (Alphabetically)Jan Netland 
Edit this Case  |  Add New Case of Resistance  |  Add Note

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.
 
Edit Case  |  Add Note  |  Add Article  |  Add New Case  |  Help

CONTRIBUTING WEED SCIENTISTS

JAN NETLAND
The Norwegian Crop Research Institute
Plant Protection Centre
Department Of Herbology
Exotic & Invasive Weed Research
One Shields Ave, Mail Stop 4
Fellesbygget, N-1432, ÅS
Norway
Email Jan Netland

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 Jan Netland for providing detailed information.
Herbicide Resistant Spiny Sowthistle Globally
(Sonchus asper)
Herbicide Resistant Spiny Sowthistle Globally
(Sonchus asper)
Drag a column header and drop it here to group by that column
Herbicide Resistant Spiny Sowthistle Globally
(Sonchus asper)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Canada (Alberta) CanadaAlberta1996 Pastures, and Spring Barley chlorsulfuron, metsulfuron-methyl, thifensulfuron-methyl, and tribenuron-methyl 7 Inhibition of Acetolactate Synthase (B/2)
163Sonchus asperSpiny Sowthistle1153
2 FranceFrance 1980 Corn (maize) atrazine 17 PSII inhibitors - Serine 264 Binders (C1 C2/5)
163Sonchus asperSpiny Sowthistle473
3 FranceFrance 2015 Chicory rimsulfuron 17 Inhibition of Acetolactate Synthase (B/2)
163Sonchus asperSpiny Sowthistle14058
4 NorwayNorway 2006 Spring Barley, and Spring wheat iodosulfuron-methyl-Na, and tribenuron-methyl 31 Inhibition of Acetolactate Synthase (B/2)
163Sonchus asperSpiny Sowthistle10976
5 United KingdomUnited Kingdom 2016 Wheat imazamox, metsulfuron-methyl, and thifensulfuron-methyl 44 Inhibition of Acetolactate Synthase (B/2)
163Sonchus asperSpiny Sowthistle18185
6 United States (Washington) United StatesWashington2000 Lentils, and Wheat imazamox, and thifensulfuron-methyl 45 Inhibition of Acetolactate Synthase (B/2)
163Sonchus asperSpiny Sowthistle5186
Literature about Similar Cases

1
Page size:
select
Page: of 1
Items 1 to 4 of 4

1
Page size:
select
Page: of 1
Items 1 to 4 of 4
PERMISSION MUST BE OBTAINED FIRST if you intend to base a significant portion of a scientific paper on data derived from this site.
Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Thursday, June 17, 2021 .  Available  www.weedscience.org
Copyright © 1993- 2021 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.