INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE
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Compact Brome (Bromus madritensis) is a monocot weed in the Poaceae family. In Spain this weed first evolved resistance to Group 9 (Legacy G) herbicides in 2018 and infests Grapes, and Olive. Group 9 (Legacy G) herbicides are known as Inhibition of Enolpyruvyl Shikimate Phosphate Synthase
(Inhibition of EPSP synthase). Research has shown that these particular biotypes are resistant to glyphosate and they may be cross-resistant to other Group 9 (Legacy G) 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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| Common Name | Compact Brome | | Species | Bromus madritensis | | Group | Inhibition of Enolpyruvyl Shikimate Phosphate Synthase
HRAC Group 9 (Legacy G)
| | Herbicides | glyphosate | | Location | Spain | | Year | 2018 | | Situation(s) | Grapes, and Olive | | Contributors - (Alphabetically) | Rafael De Prado, and Joel Torra | |
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| Additional cases of Glyphosate-Resistance in Bromus madritensis
Alfredo Manicardi, Clara Jiménez Martínez, Germán Mora Marín, Vijaya Bhaskar, José María Montull, Josep M. Llenes and Joel Torra
- Year and location seed was collected In 2025 four populations were collected from three winter cereals fields (R1. R2, R3) and from one orchard (R4) located in north-east Spain (Lleida, Catalonia). One population proceeding from uncultivated area was used as sensitive control (S).
Date of collection
S Lleida 2016
R1 Cereals : Marcovall 06/25
R2 Cereals : Torrefeta 04/25
R3 Cereals : Cervera 03/25
R4 Orchard : Borges Blanques 01/25 Edit this Note | Add New Note |
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| | Greenhouse trials comparing a known susceptible Compact Brome biotype with this Compact Brome biotype have been used to confirm resistance. For further information on the tests conducted please contact the local weed scientists that provided this information. |
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| | Genetic studies on HRAC Group 9 resistant Compact Brome 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 |
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| | 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. |
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| | 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 9 (Legacy G) resistant Compact Brome from Spain please update the database. |
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| Universidad De Cordoba
Qvimica Agricola Y Edafologa
E T S Ingenieros Agronomos
PO Box 119
Cordoba, E-14080, Andalusia
Spain
Email Rafael De Prado |
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| Research Assistant
University Of Lleida
Depart. Hortofructicultura
Botànica I Jardineria
Rovira Roure
191, Etsea, Ed. 1
Lleida, 25198, Andalusia
Spain
Email Joel Torra |
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| Drag a column header and drop it here to group by that column |
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1
| Spain | Spain | | 2018 |
Grapes, and Olive
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glyphosate
| 38 |
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase
( HRAC Group 9 (Legacy G)
| 352 | Bromus madritensis | Compact Brome | 18209 |
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Heap, I. The International Herbicide-Resistant Weed Database. Online.
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