(Rapistrum rugosum)

ALS inhibitors (B/2)

Spain, Northeastern Region
Turnipweed (Rapistrum rugosum) is a dicot weed in the Brassicaceae family.  In Spain this weed first evolved resistance to Group B/2 herbicides in 2018 and infests Winter barley, and Winter wheat.   Group B/2 herbicides are known as ALS inhibitors (Inhibition of acetolactate synthase ALS (acetohydroxyacid synthase AHAS)).  Research has shown that these particular biotypes are resistant to iodosulfuron-methyl-sodium, and tribenuron-methyl and they may be cross-resistant to other Group B/2 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 Sep 02, 2019 )

Common NameTurnipweed
SpeciesRapistrum rugosum
GroupALS inhibitors (B/2)
Herbicidesiodosulfuron-methyl-sodium, and tribenuron-methyl
LocationSpain, Northeastern Region
Situation(s)Winter barley, and Winter wheat
Contributors - (Alphabetically)Alicia Cirujeda 
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Confirmation Tests

Greenhouse trials comparing a known susceptible Turnipweed biotype with this Turnipweed biotype have been used to confirm resistance. For further information on the tests conducted please contact the local weed scientists that provided this information.

Genetic studies on Group B/2 resistant Turnipweed 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 B/2 resistant Turnipweed from Spain please update the database.
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Unidad de Sanidad Vegetal, Centro de Investigación y Tecnología
Agroalimentaria de Aragón (CITA)
Avda. Montañana 930
Zaragoza, 50059 , Aragon
Email Alicia Cirujeda


The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Spain have been instrumental in providing you this information. Particular thanks is given to Alicia Cirujeda for providing detailed information.
Herbicide Resistant Turnipweed Globally
(Rapistrum rugosum)
Herbicide Resistant Turnipweed Globally
(Rapistrum rugosum)
Drag a column header and drop it here to group by that column
Herbicide Resistant Turnipweed Globally
(Rapistrum rugosum)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Australia (Queensland) AustraliaQueensland1996 Cereals, and Wheat chlorsulfuron 1 ALS inhibitors (B/2)
142Rapistrum rugosumTurnipweed528
2 IranIran 2010 Winter wheat bispyribac-sodium, florasulam, flucarbazone-sodium, and tribenuron-methyl 79 ALS inhibitors (B/2)
142Rapistrum rugosumTurnipweed5550
3 SpainSpain 2018 Winter barley, and Winter wheat iodosulfuron-methyl-sodium, and tribenuron-methyl 38 ALS inhibitors (B/2)
142Rapistrum rugosumTurnipweed18171
Literature about Similar Cases

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PERMISSION MUST BE OBTAINED FIRST if you intend to base a significant portion of a scientific paper on data derived from this site. Citation:
Heap, I.  The International Herbicide-Resistant Weed Database.  Online.  Wednesday, October 28, 2020 .  Available Copyright © 1993- 2020 All rights reserved. Fair use of this material is encouraged. Proper citation is requested.